Debug kernels generate such messages when doing EFI pstore read and write.
Kernel version ranges from 3.2 to 3.7-rc.
Always reproducible on QEMU/OVMF instances and a Thinkpad T520 laptop.
I hope this report helps.
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
---
Lingzhu Xiang
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