On 11/22/2012 10:57 AM, Lingzhu Xiang wrote:
> mount pstore and crash
> ======================
>
> [ 83.504275] SysRq : Trigger a crash
> [ 83.505022] BUG: unable to handle kernel NULL pointer dereference at (null)
> [ 83.505022] IP: [<ffffffff81415d86>] sysrq_handle_crash+0x16/0x20
> [ 83.505022] PGD 9ea4067 PUD 9e1a067 PMD 0
> [ 83.505022] Oops: 0002 [#1] SMP
> [ 83.505022] Modules linked in: ipt_MASQUERADE nf_conntrack_netbios_ns nf_conntrack_broadcast ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables iptable_nat nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack vfat fat microcode virtio_net i2c_piix4 i2c_core
> [ 83.505022] CPU 2
> [ 83.505022] Pid: 797, comm: bash Tainted: G W 3.7.0-0.rc5.git2.1.fc19.x86_64 #1
> [ 83.505022] RIP: 0010:[<ffffffff81415d86>] [<ffffffff81415d86>] sysrq_handle_crash+0x16/0x20
> [ 83.505022] RSP: 0018:ffff88001a7abe28 EFLAGS: 00010096
> [ 83.505022] RAX: 000000000000000f RBX: ffffffff81cc28a0 RCX: 0000000000000000
> [ 83.505022] RDX: ffff880005182690 RSI: 0000000000000000 RDI: 0000000000000063
> [ 83.505022] RBP: ffff88001a7abe28 R08: 0000000000000001 R09: 0000000000000001
> [ 83.505022] R10: 0000000000000002 R11: 000000000000029c R12: 0000000000000063
> [ 83.505022] R13: 0000000000000282 R14: 0000000000000000 R15: 000000000000000a
> [ 83.505022] FS: 00007fa8d353a740(0000) GS:ffff88001b000000(0000) knlGS:0000000000000000
> [ 83.505022] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 83.505022] CR2: 0000000000000000 CR3: 0000000007fd3000 CR4: 00000000000406e0
> [ 83.505022] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 83.505022] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 83.505022] Process bash (pid: 797, threadinfo ffff88001a7aa000, task ffff880005182690)
> [ 83.505022] Stack:
> [ 83.505022] ffff88001a7abe68 ffffffff81416547 ffff88001a7abe68 0000000000000002
> [ 83.505022] ffff8800188aa940 ffffffff814165b0 ffff880016cde2b8 ffff88001a7abf50
> [ 83.505022] ffff88001a7abe98 ffffffff814165fa ffff88001a7abe98 00007fa8d3541000
> [ 83.505022] Call Trace:
> [ 83.505022] [<ffffffff81416547>] __handle_sysrq+0x127/0x190
> [ 83.505022] [<ffffffff814165b0>] ? __handle_sysrq+0x190/0x190
> [ 83.505022] [<ffffffff814165fa>] write_sysrq_trigger+0x4a/0x50
> [ 83.505022] [<ffffffff81242770>] proc_reg_write+0x80/0xc0
> [ 83.505022] [<ffffffff811d2eff>] vfs_write+0xaf/0x190
> [ 83.505022] [<ffffffff811d3255>] sys_write+0x55/0xa0
> [ 83.505022] [<ffffffff816fb8d9>] system_call_fastpath+0x16/0x1b
> [ 83.505022] Code: c1 f7 ff ff eb d8 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 66 66 66 66 90 55 c7 05 cc f4 cb 00 01 00 00 00 48 89 e5 0f ae f8 <c6> 04 25 00 00 00 00 01 5d c3 66 66 66 66 90 55 31 c0 48 89 e5
> [ 83.505022] RIP [<ffffffff81415d86>] sysrq_handle_crash+0x16/0x20
> [ 83.505022] RSP <ffff88001a7abe28>
> [ 83.505022] CR2: 0000000000000000
> [ 83.505022] ---[ end trace b0c0c16a378b5fe5 ]---
> [ 83.505022] BUG: sleeping function called from invalid context at mm/slub.c:928
> [ 83.505022] in_atomic(): 1, irqs_disabled(): 1, pid: 797, name: bash
> [ 83.505022] INFO: lockdep is turned off.
> [ 83.505022] irq event stamp: 54760
> [ 83.505022] hardirqs last enabled at (54759): [<ffffffff816f2858>] retint_swapgs+0x13/0x1b
> [ 83.505022] hardirqs last disabled at (54760): [<ffffffff816f2392>] _raw_spin_lock_irqsave+0x32/0xb0
> [ 83.505022] softirqs last enabled at (54672): [<ffffffff81072977>] __do_softirq+0x167/0x3d0
> [ 83.505022] softirqs last disabled at (54655): [<ffffffff816fcb7c>] call_softirq+0x1c/0x30
> [ 83.505022] Pid: 797, comm: bash Tainted: G D W 3.7.0-0.rc5.git2.1.fc19.x86_64 #1
> [ 83.505022] Call Trace:
> [ 83.505022] [<ffffffff810d59a0>] ? print_irqtrace_events+0xd0/0xe0
> [ 83.505022] [<ffffffff810a401d>] __might_sleep+0x18d/0x250
> [ 83.505022] [<ffffffff811b9dc7>] __kmalloc+0x67/0x2d0
> [ 83.505022] [<ffffffff8156375b>] ? efivar_create_sysfs_entry+0x3b/0x1b0
> [ 83.505022] [<ffffffff8156375b>] efivar_create_sysfs_entry+0x3b/0x1b0
> [ 83.505022] [<ffffffff81563c03>] efi_pstore_write+0x333/0x3a0
> [ 83.505022] [<ffffffff8106a3fe>] ? kmsg_dump_get_buffer+0x24e/0x2b0
> [ 83.505022] [<ffffffff812ca4c5>] ? pstore_dump+0x195/0x210
> [ 83.505022] [<ffffffff812ca45f>] pstore_dump+0x12f/0x210
> [ 83.505022] [<ffffffff8106c459>] kmsg_dump+0xf9/0x240
> [ 83.505022] [<ffffffff8106c385>] ? kmsg_dump+0x25/0x240
> [ 83.505022] [<ffffffff81068a49>] oops_exit+0x29/0x30
> [ 83.505022] [<ffffffff816f37c3>] oops_end+0x73/0xe0
> [ 83.505022] [<ffffffff816e48bf>] no_context+0x258/0x283
> [ 83.505022] [<ffffffff816e4ab4>] __bad_area_nosemaphore+0x1ca/0x1e9
> [ 83.505022] [<ffffffff816e4ae6>] bad_area_nosemaphore+0x13/0x15
> [ 83.505022] [<ffffffff816f67ce>] __do_page_fault+0x2ae/0x580
> [ 83.505022] [<ffffffff810d258d>] ? trace_hardirqs_off+0xd/0x10
> [ 83.505022] [<ffffffff816f2257>] ? _raw_spin_unlock_irqrestore+0x77/0x80
> [ 83.505022] [<ffffffff8106a97d>] ? console_unlock+0x1ed/0x4a0
> [ 83.505022] [<ffffffff816f6aae>] do_page_fault+0xe/0x10
> [ 83.505022] [<ffffffff816f6195>] do_async_page_fault+0x35/0xa0
> [ 83.505022] [<ffffffff816f2b78>] async_page_fault+0x28/0x30
> [ 83.505022] [<ffffffff81415d86>] ? sysrq_handle_crash+0x16/0x20
> [ 83.505022] [<ffffffff81416547>] __handle_sysrq+0x127/0x190
> [ 83.505022] [<ffffffff814165b0>] ? __handle_sysrq+0x190/0x190
> [ 83.505022] [<ffffffff814165fa>] write_sysrq_trigger+0x4a/0x50
> [ 83.505022] [<ffffffff81242770>] proc_reg_write+0x80/0xc0
> [ 83.505022] [<ffffffff811d2eff>] vfs_write+0xaf/0x190
> [ 83.505022] [<ffffffff811d3255>] sys_write+0x55/0xa0
> [ 83.505022] [<ffffffff816fb8d9>] system_call_fastpath+0x16/0x1b
> [ 83.596022] BUG: scheduling while atomic: bash/797/0x10000004
> [ 83.596744] INFO: lockdep is turned off.
> [ 83.603006] Modules linked in: ipt_MASQUERADE nf_conntrack_netbios_ns nf_conntrack_broadcast ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables iptable_nat nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack vfat fat microcode virtio_net i2c_piix4 i2c_core
> [ 83.609408] Pid: 797, comm: bash Tainted: G D W 3.7.0-0.rc5.git2.1.fc19.x86_64 #1
> [ 83.620001] Call Trace:
> [ 83.620461] [<ffffffff816e570c>] __schedule_bug+0x68/0x76
> [ 83.621888] [<ffffffff816f030e>] __schedule+0x99e/0xa00
> [ 83.623166] [<ffffffff810a68ca>] __cond_resched+0x2a/0x40
> [ 83.624160] [<ffffffff816f03ef>] _cond_resched+0x2f/0x40
> [ 83.625516] [<ffffffff8116b510>] __alloc_pages_nodemask+0x2d0/0xb40
> [ 83.626721] [<ffffffff816f228b>] ? _raw_spin_unlock+0x2b/0x50
> [ 83.627783] [<ffffffff811b7fb7>] ? deactivate_slab+0x567/0x7d0
> [ 83.629012] [<ffffffff8111efb7>] ? rcu_irq_exit+0x87/0xd0
> [ 83.629958] [<ffffffff811ad3a0>] alloc_pages_current+0xb0/0x120
> [ 83.631013] [<ffffffff811b7925>] ? new_slab+0x275/0x3a0
> [ 83.631878] [<ffffffff811b7970>] new_slab+0x2c0/0x3a0
> [ 83.632752] [<ffffffff816e8848>] __slab_alloc+0x3a2/0x58f
> [ 83.633697] [<ffffffff8125492e>] ? sysfs_new_dirent+0x2e/0x130
> [ 83.634710] [<ffffffff81254959>] ? sysfs_new_dirent+0x59/0x130
> [ 83.635719] [<ffffffff810d1d64>] ? mutex_remove_waiter+0x44/0x120
> [ 83.636767] [<ffffffff81254959>] ? sysfs_new_dirent+0x59/0x130
> [ 83.637767] [<ffffffff811b9087>] kmem_cache_alloc+0x237/0x290
> [ 83.643006] [<ffffffff81254959>] sysfs_new_dirent+0x59/0x130
> [ 83.644065] [<ffffffff81254d0b>] ? sysfs_addrm_finish+0x1b/0x70
> [ 83.645256] [<ffffffff81253b3b>] sysfs_add_file_mode+0x6b/0x110
> [ 83.646410] [<ffffffff81253bf2>] sysfs_add_file+0x12/0x20
> [ 83.647485] [<ffffffff81253cc6>] sysfs_create_file+0x26/0x30
> [ 83.653019] [<ffffffff8134f13c>] kobject_add_internal+0x15c/0x270
> [ 83.654105] [<ffffffff8134f643>] kobject_init_and_add+0x63/0x90
> [ 83.655228] [<ffffffff81563844>] efivar_create_sysfs_entry+0x124/0x1b0
> [ 83.656753] [<ffffffff81563c03>] efi_pstore_write+0x333/0x3a0
> [ 83.657932] [<ffffffff8106a3fe>] ? kmsg_dump_get_buffer+0x24e/0x2b0
> [ 83.663008] [<ffffffff812ca4c5>] ? pstore_dump+0x195/0x210
> [ 83.664032] [<ffffffff812ca45f>] pstore_dump+0x12f/0x210
> [ 83.664993] [<ffffffff8106c459>] kmsg_dump+0xf9/0x240
> [ 83.666077] [<ffffffff8106c385>] ? kmsg_dump+0x25/0x240
> [ 83.667124] [<ffffffff81068a49>] oops_exit+0x29/0x30
> [ 83.668147] [<ffffffff816f37c3>] oops_end+0x73/0xe0
> [ 83.673005] [<ffffffff816e48bf>] no_context+0x258/0x283
> [ 83.674916] [<ffffffff816e4ab4>] __bad_area_nosemaphore+0x1ca/0x1e9
> [ 83.677798] [<ffffffff816e4ae6>] bad_area_nosemaphore+0x13/0x15
> [ 83.680031] [<ffffffff816f67ce>] __do_page_fault+0x2ae/0x580
> [ 83.681694] [<ffffffff810d258d>] ? trace_hardirqs_off+0xd/0x10
> [ 83.691002] [<ffffffff816f2257>] ? _raw_spin_unlock_irqrestore+0x77/0x80
> [ 83.692209] [<ffffffff8106a97d>] ? console_unlock+0x1ed/0x4a0
> [ 83.693481] [<ffffffff816f6aae>] do_page_fault+0xe/0x10
> [ 83.694577] [<ffffffff816f6195>] do_async_page_fault+0x35/0xa0
> [ 83.695696] [<ffffffff816f2b78>] async_page_fault+0x28/0x30
> [ 83.696676] [<ffffffff81415d86>] ? sysrq_handle_crash+0x16/0x20
> [ 83.697674] [<ffffffff81416547>] __handle_sysrq+0x127/0x190
> [ 83.699098] [<ffffffff814165b0>] ? __handle_sysrq+0x190/0x190
> [ 83.700142] [<ffffffff814165fa>] write_sysrq_trigger+0x4a/0x50
> [ 83.701284] [<ffffffff81242770>] proc_reg_write+0x80/0xc0
> [ 83.710005] [<ffffffff811d2eff>] vfs_write+0xaf/0x190
> [ 83.710998] [<ffffffff811d3255>] sys_write+0x55/0xa0
> [ 83.711900] [<ffffffff816fb8d9>] system_call_fastpath+0x16/0x1b
>
> After reboot, mount pstore
> ==========================
>
> [root@localhost ~]# mount -t pstore -o kmsg_bytes=8000 - /dev/pstore
> [ 36.502832] BUG: sleeping function called from invalid context at mm/slub.c:928
> [ 36.504379] in_atomic(): 1, irqs_disabled(): 0, pid: 851, name: mount
> [ 36.505652] 3 locks held by mount/851:
> [ 36.506355] #0: (&type->s_umount_key#38/1){+.+.+.}, at: [<ffffffff811d5aed>] sget+0x37d/0x640
> [ 36.508899] #1: (&psinfo->read_mutex){+.+.+.}, at: [<ffffffff812ca59b>] pstore_get_records+0x3b/0x130
> [ 36.510688] #2: (&(&efivars->lock)->rlock){+.+.+.}, at: [<ffffffff8156273d>] efi_pstore_open+0x1d/0x40
> [ 36.512468] Pid: 851, comm: mount Tainted: G W 3.7.0-0.rc5.git2.1.fc19.x86_64 #1
> [ 36.514001] Call Trace:
> [ 36.514440] [<ffffffff810a401d>] __might_sleep+0x18d/0x250
> [ 36.515634] [<ffffffff811b9dc7>] __kmalloc+0x67/0x2d0
> [ 36.516509] [<ffffffff81562103>] ? efi_pstore_read+0x1c3/0x220
> [ 36.517525] [<ffffffff81562103>] efi_pstore_read+0x1c3/0x220
> [ 36.518507] [<ffffffff812ca5f1>] pstore_get_records+0x91/0x130
> [ 36.519524] [<ffffffff812eddfc>] ? selinux_d_instantiate+0x1c/0x20
> [ 36.520586] [<ffffffff812c9c10>] ? pstore_get_inode+0x50/0x50
> [ 36.521566] [<ffffffff812c9cb2>] pstore_fill_super+0xa2/0xc0
> [ 36.522542] [<ffffffff811d6b42>] mount_single+0xb2/0xe0
> [ 36.523449] [<ffffffff812c9a98>] pstore_mount+0x18/0x20
> [ 36.524322] [<ffffffff811d6d63>] mount_fs+0x43/0x1b0
> [ 36.525360] [<ffffffff811f4ee3>] vfs_kern_mount+0x73/0x110
> [ 36.526408] [<ffffffff811f5984>] do_kern_mount+0x54/0x110
> [ 36.530014] [<ffffffff811f7535>] do_mount+0x315/0x8e0
> [ 36.531181] [<ffffffff811f708a>] ? copy_mount_options+0x3a/0x180
> [ 36.532390] [<ffffffff811f7b8e>] sys_mount+0x8e/0xe0
> [ 36.533438] [<ffffffff816fb8d9>] system_call_fastpath+0x16/0x1b
> [ 36.540017] BUG: scheduling while atomic: mount/851/0x10000002
> [ 36.541315] 3 locks held by mount/851:
> [ 36.541952] #0: (&type->s_umount_key#38/1){+.+.+.}, at: [<ffffffff811d5aed>] sget+0x37d/0x640
> [ 36.544260] #1: (&psinfo->read_mutex){+.+.+.}, at: [<ffffffff812ca59b>] pstore_get_records+0x3b/0x130
> [ 36.546146] #2: (&(&efivars->lock)->rlock){+.+.+.}, at: [<ffffffff8156273d>] efi_pstore_open+0x1d/0x40
> [ 36.547964] Modules linked in: ipt_MASQUERADE nf_conntrack_netbios_ns nf_conntrack_broadcast ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables iptable_nat nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack vfat fat microcode i2c_piix4 i2c_core virtio_net
> [ 36.560478] Pid: 851, comm: mount Tainted: G W 3.7.0-0.rc5.git2.1.fc19.x86_64 #1
> [ 36.562019] Call Trace:
> [ 36.562655] [<ffffffff816e570c>] __schedule_bug+0x68/0x76
> [ 36.570017] [<ffffffff816f030e>] __schedule+0x99e/0xa00
> [ 36.570915] [<ffffffff810a68ca>] __cond_resched+0x2a/0x40
> [ 36.571974] [<ffffffff816f03ef>] _cond_resched+0x2f/0x40
> [ 36.573279] [<ffffffff811b9dcc>] __kmalloc+0x6c/0x2d0
> [ 36.574642] [<ffffffff81562103>] ? efi_pstore_read+0x1c3/0x220
> [ 36.576426] [<ffffffff81562103>] efi_pstore_read+0x1c3/0x220
> [ 36.577679] [<ffffffff812ca5f1>] pstore_get_records+0x91/0x130
> [ 36.578981] [<ffffffff812eddfc>] ? selinux_d_instantiate+0x1c/0x20
> [ 36.585520] [<ffffffff812c9c10>] ? pstore_get_inode+0x50/0x50
> [ 36.586595] [<ffffffff812c9cb2>] pstore_fill_super+0xa2/0xc0
> [ 36.587648] [<ffffffff811d6b42>] mount_single+0xb2/0xe0
> [ 36.588625] [<ffffffff812c9a98>] pstore_mount+0x18/0x20
> [ 36.590078] [<ffffffff811d6d63>] mount_fs+0x43/0x1b0
> [ 36.591511] [<ffffffff811f4ee3>] vfs_kern_mount+0x73/0x110
> [ 36.592847] [<ffffffff811f5984>] do_kern_mount+0x54/0x110
> [ 36.600017] [<ffffffff811f7535>] do_mount+0x315/0x8e0
> [ 36.601128] [<ffffffff811f708a>] ? copy_mount_options+0x3a/0x180
> [ 36.602257] [<ffffffff811f7b8e>] sys_mount+0x8e/0xe0
> [ 36.603221] [<ffffffff816fb8d9>] system_call_fastpath+0x16/0x1b
>
> After reboot, rm a pstore entry
> ===============================
>
> [root@localhost ~]# rm -f /dev/pstore/dmesg-efi-9
> [ 55.572466]
> [ 55.572767] ======================================================
> [ 55.573015] [ INFO: possible circular locking dependency detected ]
> [ 55.573015] 3.7.0-0.rc5.git2.1.fc19.x86_64 #1 Tainted: G W
> [ 55.573015] -------------------------------------------------------
> [ 55.573015] rm/855 is trying to acquire lock:
> [ 55.573015] (&(&efivars->lock)->rlock){+.+.+.}, at: [<ffffffff815639c5>] efi_pstore_write+0xf5/0x3a0
> [ 55.573015]
> [ 55.573015] but task is already holding lock:
> [ 55.573015] (&sb->s_type->i_mutex_key#15){+.+.+.}, at: [<ffffffff811e0a53>] vfs_unlink+0x53/0x110
> [ 55.573015]
> [ 55.573015] which lock already depends on the new lock.
> [ 55.573015]
> [ 55.573015]
> [ 55.573015] the existing dependency chain (in reverse order) is:
> [ 55.573015]
> -> #1 (&sb->s_type->i_mutex_key#15){+.+.+.}:
> [ 55.573015] [<ffffffff810d7ee1>] lock_acquire+0xa1/0x1f0
> [ 55.573015] [<ffffffff816ee226>] mutex_lock_nested+0x76/0x390
> [ 55.573015] [<ffffffff812ca0dc>] pstore_mkfile+0x1bc/0x390
> [ 55.573015] [<ffffffff812ca621>] pstore_get_records+0xc1/0x130
> [ 55.573015] [<ffffffff812c9cb2>] pstore_fill_super+0xa2/0xc0
> [ 55.573015] [<ffffffff811d6b42>] mount_single+0xb2/0xe0
> [ 55.573015] [<ffffffff812c9a98>] pstore_mount+0x18/0x20
> [ 55.573015] [<ffffffff811d6d63>] mount_fs+0x43/0x1b0
> [ 55.573015] [<ffffffff811f4ee3>] vfs_kern_mount+0x73/0x110
> [ 55.573015] [<ffffffff811f5984>] do_kern_mount+0x54/0x110
> [ 55.573015] [<ffffffff811f7535>] do_mount+0x315/0x8e0
> [ 55.573015] [<ffffffff811f7b8e>] sys_mount+0x8e/0xe0
> [ 55.573015] [<ffffffff816fb8d9>] system_call_fastpath+0x16/0x1b
> [ 55.573015]
> -> #0 (&(&efivars->lock)->rlock){+.+.+.}:
> [ 55.573015] [<ffffffff810d775f>] __lock_acquire+0x1aff/0x1bb0
> [ 55.573015] [<ffffffff810d7ee1>] lock_acquire+0xa1/0x1f0
> [ 55.573015] [<ffffffff816f17a6>] _raw_spin_lock+0x46/0x80
> [ 55.573015] [<ffffffff815639c5>] efi_pstore_write+0xf5/0x3a0
> [ 55.573015] [<ffffffff81563c95>] efi_pstore_erase+0x25/0x30
> [ 55.573015] [<ffffffff812c9adf>] pstore_unlink+0x3f/0x60
> [ 55.573015] [<ffffffff811e0a9e>] vfs_unlink+0x9e/0x110
> [ 55.573015] [<ffffffff811e0c11>] do_unlinkat+0x101/0x1b0
> [ 55.573015] [<ffffffff811e368b>] sys_unlinkat+0x1b/0x40
> [ 55.573015] [<ffffffff816fb8d9>] system_call_fastpath+0x16/0x1b
> [ 55.573015]
> [ 55.573015] other info that might help us debug this:
> [ 55.573015]
> [ 55.573015] Possible unsafe locking scenario:
> [ 55.573015]
> [ 55.573015] CPU0 CPU1
> [ 55.573015] ---- ----
> [ 55.573015] lock(&sb->s_type->i_mutex_key#15);
> [ 55.573015] lock(&(&efivars->lock)->rlock);
> [ 55.573015] lock(&sb->s_type->i_mutex_key#15);
> [ 55.573015] lock(&(&efivars->lock)->rlock);
> [ 55.573015]
> [ 55.573015] *** DEADLOCK ***
> [ 55.573015]
> [ 55.573015] 3 locks held by rm/855:
> [ 55.573015] #0: (sb_writers#12){.+.+..}, at: [<ffffffff811f5c24>] mnt_want_write+0x24/0x50
> [ 55.573015] #1: (&sb->s_type->i_mutex_key#15/1){+.+...}, at: [<ffffffff811e0bbb>] do_unlinkat+0xab/0x1b0
> [ 55.573015] #2: (&sb->s_type->i_mutex_key#15){+.+.+.}, at: [<ffffffff811e0a53>] vfs_unlink+0x53/0x110
> [ 55.573015]
> [ 55.573015] stack backtrace:
> [ 55.573015] Pid: 855, comm: rm Tainted: G W 3.7.0-0.rc5.git2.1.fc19.x86_64 #1
> [ 55.573015] Call Trace:
> [ 55.573015] [<ffffffff816e608f>] print_circular_bug+0x1fb/0x20c
> [ 55.573015] [<ffffffff810d775f>] __lock_acquire+0x1aff/0x1bb0
> [ 55.573015] [<ffffffff81356bdb>] ? number.isra.2+0x35b/0x390
> [ 55.573015] [<ffffffff810d7ee1>] lock_acquire+0xa1/0x1f0
> [ 55.573015] [<ffffffff815639c5>] ? efi_pstore_write+0xf5/0x3a0
> [ 55.573015] [<ffffffff816f17a6>] _raw_spin_lock+0x46/0x80
> [ 55.573015] [<ffffffff815639c5>] ? efi_pstore_write+0xf5/0x3a0
> [ 55.573015] [<ffffffff815639c5>] efi_pstore_write+0xf5/0x3a0
> [ 55.573015] [<ffffffff810d258d>] ? trace_hardirqs_off+0xd/0x10
> [ 55.573015] [<ffffffff810ace0f>] ? local_clock+0x6f/0x80
> [ 55.573015] [<ffffffff810d2f0f>] ? lock_release_holdtime.part.26+0xf/0x180
> [ 55.573015] [<ffffffff812e5ccb>] ? avc_has_perm_flags+0x17b/0x2c0
> [ 55.573015] [<ffffffff812e5b79>] ? avc_has_perm_flags+0x29/0x2c0
> [ 55.573015] [<ffffffff81563c95>] efi_pstore_erase+0x25/0x30
> [ 55.573015] [<ffffffff812c9adf>] pstore_unlink+0x3f/0x60
> [ 55.573015] [<ffffffff811e0a9e>] vfs_unlink+0x9e/0x110
> [ 55.573015] [<ffffffff811e0c11>] do_unlinkat+0x101/0x1b0
> [ 55.573015] [<ffffffff810d8a6d>] ? trace_hardirqs_on_caller+0x10d/0x1a0
> [ 55.573015] [<ffffffff8110495c>] ? __audit_syscall_entry+0xcc/0x300
> [ 55.573015] [<ffffffff8135a76e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> [ 55.573015] [<ffffffff811e368b>] sys_unlinkat+0x1b/0x40
> [ 55.573015] [<ffffffff816fb8d9>] system_call_fastpath+0x16/0x1b
I was just verifying this bug with Fedora 3.9-rc6 kernel containing
81fa4e581d9283f7992a0d8c534bb141eb840a14 efivars: Disable external interrupt while holding efivars->lock
a93bc0c6e07ed9bac44700280e65e2945d864fd4 efi_pstore: Introducing workqueue updating sysfs
Booted kernel with pstore.backend=efi efivars.pstore_disable=N.
Apparently there is no longer any efi pstore call trace during panic.
After reboot, mounting pstore still produces similar call traces:
[root@ibm-x3550m3-02 ~]# mount -t pstore - /sys/fs/pstore/
[ 90.896585] ------------[ cut here ]------------
[ 90.901213] WARNING: at kernel/lockdep.c:2739 lockdep_trace_alloc+0xd5/0xe0()
[ 90.908350] Hardware name: System x3550 M3 -[7944I21]-
[ 90.913487] Modules linked in: vfat fat iTCO_wdt iTCO_vendor_support cdc_ether usbnet lpc_ich shpchp serio_raw bnx2 acpi_cpufreq mperf coretemp mii kvm_intel kvm crc32c_intel i2c_i801 i7core_edac microcode ioatdma mfd_core edac_core dca mgag200 i2c_algo_bit drm_kms_helper mptsas ttm mptscsih drm mptbase i2c_core scsi_transport_sas
[ 90.943439] Pid: 945, comm: mount Tainted: G W 3.9.0-0.rc6.git2.1.fc19.x86_64 #1
[ 90.951702] Call Trace:
[ 90.954157] [<ffffffff81068e26>] warn_slowpath_common+0x66/0x80
[ 90.960168] [<ffffffff81589825>] ? efi_pstore_read+0x225/0x2d0
[ 90.966090] [<ffffffff81068efa>] warn_slowpath_null+0x1a/0x20
[ 90.971925] [<ffffffff810db7b5>] lockdep_trace_alloc+0xd5/0xe0
[ 90.977848] [<ffffffff811bcc9f>] __kmalloc+0x4f/0x390
[ 90.982991] [<ffffffff81589825>] efi_pstore_read+0x225/0x2d0
[ 90.988743] [<ffffffff815876a9>] ? efi_pstore_open+0x19/0x30
[ 90.994492] [<ffffffff812d543a>] pstore_get_records+0x9a/0x150
[ 91.000414] [<ffffffff812f8b8c>] ? selinux_d_instantiate+0x1c/0x20
[ 91.006682] [<ffffffff812d4b20>] ? parse_options+0x80/0x80
[ 91.012256] [<ffffffff812d4bc5>] pstore_fill_super+0xa5/0xc0
[ 91.018005] [<ffffffff811debb2>] mount_single+0xa2/0xd0
[ 91.023321] [<ffffffff812d49e8>] pstore_mount+0x18/0x20
[ 91.028636] [<ffffffff811deca9>] mount_fs+0x39/0x1b0
[ 91.033693] [<ffffffff811fc943>] vfs_kern_mount+0x63/0xf0
[ 91.039183] [<ffffffff811ff04d>] do_mount+0x1fd/0xa00
[ 91.044323] [<ffffffff811fecd6>] ? copy_mount_options+0x36/0x170
[ 91.050420] [<ffffffff811ff8d3>] sys_mount+0x83/0xc0
[ 91.055475] [<ffffffff81723019>] system_call_fastpath+0x16/0x1b
[ 91.061480] ---[ end trace dfa024323430202e ]---
[ 91.066101] BUG: sleeping function called from invalid context at mm/slub.c:925
[ 91.073408] in_atomic(): 1, irqs_disabled(): 1, pid: 945, name: mount
[ 91.079847] INFO: lockdep is turned off.
[ 91.083773] irq event stamp: 5910
[ 91.087089] hardirqs last enabled at (5909): [<ffffffff81716063>] mutex_lock_nested+0x313/0x3c0
[ 91.095892] hardirqs last disabled at (5910): [<ffffffff8171928f>] _raw_spin_lock_irq+0x1f/0x90
[ 91.104613] softirqs last enabled at (5898): [<ffffffff81073503>] __do_softirq+0x193/0x400
[ 91.112987] softirqs last disabled at (5893): [<ffffffff81073935>] irq_exit+0xb5/0xc0
[ 91.120839] Pid: 945, comm: mount Tainted: G W 3.9.0-0.rc6.git2.1.fc19.x86_64 #1
[ 91.129103] Call Trace:
[ 91.131555] [<ffffffff810a32b9>] __might_sleep+0x179/0x230
[ 91.137130] [<ffffffff811bccb7>] __kmalloc+0x67/0x390
[ 91.142272] [<ffffffff81589825>] efi_pstore_read+0x225/0x2d0
[ 91.148020] [<ffffffff815876a9>] ? efi_pstore_open+0x19/0x30
[ 91.153769] [<ffffffff812d543a>] pstore_get_records+0x9a/0x150
[ 91.159691] [<ffffffff812f8b8c>] ? selinux_d_instantiate+0x1c/0x20
[ 91.165961] [<ffffffff812d4b20>] ? parse_options+0x80/0x80
[ 91.171536] [<ffffffff812d4bc5>] pstore_fill_super+0xa5/0xc0
[ 91.177284] [<ffffffff811debb2>] mount_single+0xa2/0xd0
[ 91.182599] [<ffffffff812d49e8>] pstore_mount+0x18/0x20
[ 91.187916] [<ffffffff811deca9>] mount_fs+0x39/0x1b0
[ 91.192970] [<ffffffff811fc943>] vfs_kern_mount+0x63/0xf0
[ 91.198460] [<ffffffff811ff04d>] do_mount+0x1fd/0xa00
[ 91.203601] [<ffffffff811fecd6>] ? copy_mount_options+0x36/0x170
[ 91.209694] [<ffffffff811ff8d3>] sys_mount+0x83/0xc0
[ 91.214748] [<ffffffff81723019>] system_call_fastpath+0x16/0x1b
[ 91.291775] pstore: failed to load 1 record(s) from 'efi'
[ 91.297464] SELinux: initialized (dev pstore, type pstore), not configured for labeling
(Repeat for each entry)
rm -f /sys/fs/pstore/* is fine.
rm -f /sys/firmware/efi/efivars/dump-* && cat /sys/fs/pstore/* is fine.
rm -f /sys/fs/pstore/* && cat /sys/firmware/efi/efivars/dump-* will explode:
[root@ibm-x3550m3-02 ~]# rm -f /sys/fs/pstore/*
[root@ibm-x3550m3-02 ~]# cat /sys/firmware/efi/efivars/dump-* >/dev/null
[ 110.082560] general protection fault: 0000 [#1] SMP
[ 110.087570] Modules linked in: vfat(F) fat(F) acpi_cpufreq(F) mperf(F) coretemp(F) kvm_intel(F) kvm(F) crc32c_intel(F) iTCO_wdt(F) cdc_ether(F) iTCO_vendor_support(F) usbnet(F) shpchp(F) i7core_edac(F) ioatdma(F) mii(F) lpc_ich(F) microcode(F) serio_raw(F) edac_core(F) dca(F) i2c_i801(F) mfd_core(F) bnx2(F) mgag200(F) i2c_algo_bit(F) mptsas(F) drm_kms_helper(F) mptscsih(F) ttm(F) mptbase(F) drm(F) scsi_transport_sas(F) i2c_core(F)
[ 110.126374] CPU 0
[ 110.128221] Pid: 6182, comm: cat Tainted: GF W 3.9.0-0.rc6.git2.1.eficheck.fc19.x86_64 #1 IBM System x3550 M3 -[7944I21]-/69Y4438
[ 110.141273] RIP: 0010:[<ffffffff8137ca70>] [<ffffffff8137ca70>] do_raw_spin_lock+0x150/0x150
[ 110.149820] RSP: 0018:ffff88026e45fe60 EFLAGS: 00010046
[ 110.155135] RAX: ffff8802710e4dc0 RBX: 6b6b6b6b6b6b6b6b RCX: 0000000000000000
[ 110.162270] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 6b6b6b6b6b6b6b6b
[ 110.169403] RBP: ffff88026e45fe88 R08: 0000000000000002 R09: 0000000000000001
[ 110.176536] R10: ffff8802710e4dc0 R11: 0000000000000246 R12: 6b6b6b6b6b6b6b83
[ 110.183669] R13: ffff880470a837e0 R14: ffff88026e45ff50 R15: ffff88026e45ff50
[ 110.190804] FS: 00007fcab5c99740(0000) GS:ffff880276600000(0000) knlGS:0000000000000000
[ 110.198893] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 110.204640] CR2: 00000000007b5038 CR3: 000000026d773000 CR4: 00000000000007f0
[ 110.211773] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 110.218908] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 110.226042] Process cat (pid: 6182, threadinfo ffff88026e45e000, task ffff8802710e4dc0)
[ 110.234042] Stack:
[ 110.236059] ffffffff8173407a ffffffff8159f233 ffff88026e5e5290 6b6b6b6b6b6b6b6b
[ 110.243533] ffff880470a833e0 ffff88026e45fef8 ffffffff8159f233 ffff88026e45fec8
[ 110.251008] ffffffff812f99a5 0000000000010000 00000000007a5000 ffff88026e5e5280
[ 110.258483] Call Trace:
[ 110.260937] [<ffffffff8173407a>] ? _raw_spin_lock_irq+0x5a/0x90
[ 110.266949] [<ffffffff8159f233>] ? efivarfs_file_read+0x53/0x180
[ 110.273045] [<ffffffff8159f233>] efivarfs_file_read+0x53/0x180
[ 110.278968] [<ffffffff812f99a5>] ? security_file_permission+0x95/0xb0
[ 110.285501] [<ffffffff811e0f4c>] vfs_read+0xac/0x180
[ 110.290554] [<ffffffff811e11d5>] sys_read+0x55/0xa0
[ 110.295525] [<ffffffff8173e159>] system_call_fastpath+0x16/0x1b
[ 110.301529] Code: 81 48 89 df e8 f0 00 3b 00 e9 04 ff ff ff 48 c7 c6 9b 0f a4 81 e8 df 00 3b 00 e9 e0 fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 <8b> 17 55 31 c9 48 89 e5 89 d0 c1 e8 10 66 39 c2 74 0e 89 c8 5d
[ 110.321713] RIP [<ffffffff8137ca70>] do_raw_spin_lock+0x150/0x150
[ 110.327915] RSP <ffff88026e45fe60>
[ 110.331406] ---[ end trace 99f3bec2f519b797 ]---
[ 110.611415] BUG: sleeping function called from invalid context at kernel/rwsem.c:20
[ 110.619070] in_atomic(): 1, irqs_disabled(): 1, pid: 6182, name: cat
[ 110.625425] INFO: lockdep is turned off.
[ 110.629351] irq event stamp: 0
[ 110.632409] hardirqs last enabled at (0): [< (null)>] (null)
[ 110.639823] hardirqs last disabled at (0): [<ffffffff81068218>] copy_process.part.22+0x5e8/0x1650
[ 110.648716] softirqs last enabled at (0): [<ffffffff81068218>] copy_process.part.22+0x5e8/0x1650
[ 110.657604] softirqs last disabled at (0): [< (null)>] (null)
[ 110.665018] Pid: 6182, comm: cat Tainted: GF D W 3.9.0-0.rc6.git2.1.eficheck.fc19.x86_64 #1
[ 110.673976] Call Trace:
[ 110.676429] [<ffffffff810da610>] ? print_irqtrace_events+0xd0/0xe0
[ 110.682699] [<ffffffff810a59fb>] __might_sleep+0x18b/0x250
[ 110.688274] [<ffffffff8173151a>] down_read+0x2a/0x98
[ 110.693329] [<ffffffff81084a34>] exit_signals+0x24/0x130
[ 110.698732] [<ffffffff81070bed>] do_exit+0xbd/0xc90
[ 110.703701] [<ffffffff8106df18>] ? kmsg_dump+0x1b8/0x240
[ 110.709101] [<ffffffff8106dd85>] ? kmsg_dump+0x25/0x240
[ 110.714419] [<ffffffff81735f83>] oops_end+0xa3/0xf0
[ 110.719392] [<ffffffff8101eb18>] die+0x58/0x90
[ 110.723925] [<ffffffff817359b2>] do_general_protection+0xe2/0x170
[ 110.730106] [<ffffffff81735023>] ? restore_args+0x30/0x30
[ 110.735596] [<ffffffff81735298>] general_protection+0x28/0x30
[ 110.741430] [<ffffffff8137ca70>] ? do_raw_spin_lock+0x150/0x150
[ 110.747440] [<ffffffff8173407a>] ? _raw_spin_lock_irq+0x5a/0x90
[ 110.753448] [<ffffffff8159f233>] ? efivarfs_file_read+0x53/0x180
[ 110.759542] [<ffffffff8159f233>] efivarfs_file_read+0x53/0x180
[ 110.765466] [<ffffffff812f99a5>] ? security_file_permission+0x95/0xb0
[ 110.771998] [<ffffffff811e0f4c>] vfs_read+0xac/0x180
[ 110.777052] [<ffffffff811e11d5>] sys_read+0x55/0xa0
[ 110.782019] [<ffffffff8173e159>] system_call_fastpath+0x16/0x1b
[ 110.788028] BUG: scheduling while atomic: cat/6182/0x10000002
[ 110.793774] INFO: lockdep is turned off.
[ 110.797698] Modules linked in: vfat(F) fat(F) acpi_cpufreq(F) mperf(F) coretemp(F) kvm_intel(F) kvm(F) crc32c_intel(F) iTCO_wdt(F) cdc_ether(F) iTCO_vendor_support(F) usbnet(F) shpchp(F) i7core_edac(F) ioatdma(F) mii(F) lpc_ich(F) microcode(F) serio_raw(F) edac_core(F) dca(F) i2c_i801(F) mfd_core(F) bnx2(F) mgag200(F) i2c_algo_bit(F) mptsas(F) drm_kms_helper(F) mptscsih(F) ttm(F) mptbase(F) drm(F) scsi_transport_sas(F) i2c_core(F)
[ 110.836505] irq event stamp: 0
[ 110.839564] hardirqs last enabled at (0): [< (null)>] (null)
[ 110.846978] hardirqs last disabled at (0): [<ffffffff81068218>] copy_process.part.22+0x5e8/0x1650
[ 110.855868] softirqs last enabled at (0): [<ffffffff81068218>] copy_process.part.22+0x5e8/0x1650
[ 110.864755] softirqs last disabled at (0): [< (null)>] (null)
[ 110.872173] Pid: 6182, comm: cat Tainted: GF D W 3.9.0-0.rc6.git2.1.eficheck.fc19.x86_64 #1
[ 110.881129] Call Trace:
[ 110.883580] [<ffffffff810da610>] ? print_irqtrace_events+0xd0/0xe0
[ 110.889853] [<ffffffff81727ce1>] __schedule_bug+0x68/0x78
[ 110.895342] [<ffffffff817322e1>] __schedule+0x9c1/0xa20
[ 110.900660] [<ffffffff810a82aa>] __cond_resched+0x2a/0x40
[ 110.906150] [<ffffffff817323bf>] _cond_resched+0x2f/0x40
[ 110.911551] [<ffffffff8173151f>] down_read+0x2f/0x98
[ 110.916604] [<ffffffff81084a34>] exit_signals+0x24/0x130
[ 110.922005] [<ffffffff81070bed>] do_exit+0xbd/0xc90
[ 110.926974] [<ffffffff8106df18>] ? kmsg_dump+0x1b8/0x240
[ 110.932374] [<ffffffff8106dd85>] ? kmsg_dump+0x25/0x240
[ 110.937690] [<ffffffff81735f83>] oops_end+0xa3/0xf0
[ 110.942660] [<ffffffff8101eb18>] die+0x58/0x90
[ 110.947193] [<ffffffff817359b2>] do_general_protection+0xe2/0x170
[ 110.953377] [<ffffffff81735023>] ? restore_args+0x30/0x30
[ 110.958864] [<ffffffff81735298>] general_protection+0x28/0x30
[ 110.964700] [<ffffffff8137ca70>] ? do_raw_spin_lock+0x150/0x150
[ 110.970711] [<ffffffff8173407a>] ? _raw_spin_lock_irq+0x5a/0x90
[ 110.976722] [<ffffffff8159f233>] ? efivarfs_file_read+0x53/0x180
[ 110.982816] [<ffffffff8159f233>] efivarfs_file_read+0x53/0x180
[ 110.988738] [<ffffffff812f99a5>] ? security_file_permission+0x95/0xb0
[ 110.995269] [<ffffffff811e0f4c>] vfs_read+0xac/0x180
[ 111.000322] [<ffffffff811e11d5>] sys_read+0x55/0xa0
[ 111.005292] [<ffffffff8173e159>] system_call_fastpath+0x16/0x1b
[ 111.011493] note: cat[6182] exited with preempt_count 1
[ 111.016891] BUG: scheduling while atomic: cat/6182/0x10000002
[ 111.022806] INFO: lockdep is turned off.
[ 111.026893] Modules linked in: vfat(F) fat(F) acpi_cpufreq(F) mperf(F) coretemp(F) kvm_intel(F) kvm(F) crc32c_intel(F) iTCO_wdt(F) cdc_ether(F) iTCO_vendor_support(F) usbnet(F) shpchp(F) i7core_edac(F) ioatdma(F) mii(F) lpc_ich(F) microcode(F) serio_raw(F) edac_core(F) dca(F) i2c_i801(F) mfd_core(F) bnx2(F) mgag200(F) i2c_algo_bit(F) mptsas(F) drm_kms_helper(F) mptscsih(F) ttm(F) mptbase(F) drm(F) scsi_transport_sas(F) i2c_core(F)
[ 111.067839] Pid: 6182, comm: cat Tainted: GF D W 3.9.0-0.rc6.git2.1.eficheck.fc19.x86_64 #1
[ 111.076968] Call Trace:
[ 111.079630] [<ffffffff81727ce1>] __schedule_bug+0x68/0x78
[ 111.085290] [<ffffffff817322e1>] __schedule+0x9c1/0xa20
[ 111.090779] [<ffffffff8109a150>] ? lock_hrtimer_base.isra.19+0x30/0x60
[ 111.097575] [<ffffffff810a82aa>] __cond_resched+0x2a/0x40
[ 111.103234] [<ffffffff817323bf>] _cond_resched+0x2f/0x40
[ 111.108783] [<ffffffff8173151f>] down_read+0x2f/0x98
[ 111.114010] [<ffffffff810ef4fe>] acct_collect+0x4e/0x1b0
[ 111.119591] [<ffffffff81071496>] do_exit+0x966/0xc90
[ 111.124816] [<ffffffff8106df18>] ? kmsg_dump+0x1b8/0x240
[ 111.130383] [<ffffffff8106dd85>] ? kmsg_dump+0x25/0x240
[ 111.135859] [<ffffffff81735f83>] oops_end+0xa3/0xf0
[ 111.141007] [<ffffffff8101eb18>] die+0x58/0x90
[ 111.145705] [<ffffffff817359b2>] do_general_protection+0xe2/0x170
[ 111.152069] [<ffffffff81735023>] ? restore_args+0x30/0x30
[ 111.157743] [<ffffffff81735298>] general_protection+0x28/0x30
[ 111.163756] [<ffffffff8137ca70>] ? do_raw_spin_lock+0x150/0x150
[ 111.169935] [<ffffffff8173407a>] ? _raw_spin_lock_irq+0x5a/0x90
[ 111.176114] [<ffffffff8159f233>] ? efivarfs_file_read+0x53/0x180
[ 111.182374] [<ffffffff8159f233>] efivarfs_file_read+0x53/0x180
[ 111.188469] [<ffffffff812f99a5>] ? security_file_permission+0x95/0xb0
[ 111.195161] [<ffffffff811e0f4c>] vfs_read+0xac/0x180
[ 111.200382] [<ffffffff811e11d5>] sys_read+0x55/0xa0
[ 111.205523] [<ffffffff8173e159>] system_call_fastpath+0x16/0x1b
[ 111.260541] BUG: scheduling while atomic: cat/6182/0x10000002
[ 111.266449] INFO: lockdep is turned off.
[ 111.270549] Modules linked in: vfat(F) fat(F) acpi_cpufreq(F) mperf(F) coretemp(F) kvm_intel(F) kvm(F) crc32c_intel(F) iTCO_wdt(F) cdc_ether(F) iTCO_vendor_support(F) usbnet(F) shpchp(F) i7core_edac(F) ioatdma(F) mii(F) lpc_ich(F) microcode(F) serio_raw(F) edac_core(F) dca(F) i2c_i801(F) mfd_core(F) bnx2(F) mgag200(F) i2c_algo_bit(F) mptsas(F) drm_kms_helper(F) mptscsih(F) ttm(F) mptbase(F) drm(F) scsi_transport_sas(F) i2c_core(F)
[ 111.311337] Pid: 6182, comm: cat Tainted: GF D W 3.9.0-0.rc6.git2.1.eficheck.fc19.x86_64 #1
[ 111.320464] Call Trace:
[ 111.323087] [<ffffffff81727ce1>] __schedule_bug+0x68/0x78
[ 111.328749] [<ffffffff817322e1>] __schedule+0x9c1/0xa20
[ 111.334231] [<ffffffff810a82aa>] __cond_resched+0x2a/0x40
[ 111.339914] [<ffffffff817323bf>] _cond_resched+0x2f/0x40
[ 111.345499] [<ffffffff8119c3cb>] remove_vma+0x2b/0x80
[ 111.350788] [<ffffffff8119f72c>] exit_mmap+0xec/0x170
[ 111.356097] [<ffffffff810672bb>] mmput+0x8b/0xf0
[ 111.360965] [<ffffffff81070dc1>] do_exit+0x291/0xc90
[ 111.366193] [<ffffffff8106df18>] ? kmsg_dump+0x1b8/0x240
[ 111.371778] [<ffffffff8106dd85>] ? kmsg_dump+0x25/0x240
[ 111.377260] [<ffffffff81735f83>] oops_end+0xa3/0xf0
[ 111.382385] [<ffffffff8101eb18>] die+0x58/0x90
[ 111.387081] [<ffffffff817359b2>] do_general_protection+0xe2/0x170
[ 111.393419] [<ffffffff81735023>] ? restore_args+0x30/0x30
[ 111.399075] [<ffffffff81735298>] general_protection+0x28/0x30
[ 111.405083] [<ffffffff8137ca70>] ? do_raw_spin_lock+0x150/0x150
[ 111.411258] [<ffffffff8173407a>] ? _raw_spin_lock_irq+0x5a/0x90
[ 111.417442] [<ffffffff8159f233>] ? efivarfs_file_read+0x53/0x180
[ 111.423710] [<ffffffff8159f233>] efivarfs_file_read+0x53/0x180
[ 111.429800] [<ffffffff812f99a5>] ? security_file_permission+0x95/0xb0
[ 111.436495] [<ffffffff811e0f4c>] vfs_read+0xac/0x180
[ 111.441717] [<ffffffff811e11d5>] sys_read+0x55/0xa0
[ 111.446854] [<ffffffff8173e159>] system_call_fastpath+0x16/0x1b
Segmentation fault
.eficheck is just Fedoar 19 3.9-rc6 kernel with Matthew's patchset:
efi: Determine how much space is used by boot services-only variables.
...
Eariler log was messed up while further reproduction was blocked without
the patchset. The call traces are the same though.
Lingzhu Xiang
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