[CCing Ebru] On Thu 02-06-16 13:50:46, Michal Hocko wrote: > [CCing Andrea and Kirill] Hmm, thinking about it little bit more it might be related to "mm, thp: make swapin readahead under down_read of mmap_sem". I didn't get to look closer at the patch but maybe revalidate after mmap sem is dropped is not sufficient. > On Thu 02-06-16 20:14:38, Tetsuo Handa wrote: > > FYI, I hit this bug while compiling kernel. Is this known issue? > > > > ---------------------------------------- > > [ 2893.482222] vma ffff880014150428 start 00002afed7db3000 end 00002afed89bc000 > > next ffff8800106b7de8 prev ffff880014150a58 mm ffff88007a9e8d40 > > prot 8000000000000025 anon_vma ffff880016c19d18 vm_ops (null) > > pgoff 2afed7db3 file (null) private_data (null) > > flags: 0x100073(read|write|mayread|maywrite|mayexec|account) > > [ 2893.490801] ------------[ cut here ]------------ > > [ 2893.492087] kernel BUG at mm/rmap.c:1253! > > [ 2893.493240] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC > > [ 2893.494789] Modules linked in: ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_mangle ip6table_raw ip6table_filter ip6_tables iptable_mangle iptable_raw iptable_filter coretemp pcspkr sg vmw_vmci i2c_piix4 ip_tables sd_mod ata_generic pata_acpi serio_raw ata_piix vmwgfx mptspi ahci drm_kms_helper syscopyarea libahci scsi_transport_spi sysfillrect sysimgblt mptscsih fb_sys_fops libata e1000 ttm mptbase drm i2c_core > > [ 2893.509843] CPU: 0 PID: 50 Comm: khugepaged Not tainted 4.7.0-rc1-next-20160602 #431 > > [ 2893.512105] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013 > > [ 2893.515024] task: ffff88007c036440 ti: ffff88007c040000 task.ti: ffff88007c040000 > > [ 2893.517340] RIP: 0010:[<ffffffff811ca46c>] [<ffffffff811ca46c>] page_add_new_anon_rmap+0x13c/0x180 > > [ 2893.519977] RSP: 0018:ffff88007c043ce8 EFLAGS: 00010246 > > [ 2893.521917] RAX: 0000000000000149 RBX: ffffea00001b0000 RCX: 0000000000000000 > > [ 2893.524218] RDX: 0000000000000000 RSI: ffffffff819e92ea RDI: 00000000ffffffff > > [ 2893.526451] RBP: ffff88007c043d08 R08: 0000000000000001 R09: 0000000000000001 > > [ 2893.528822] R10: 0000000000000001 R11: 000000000000058e R12: ffff880014150428 > > [ 2893.531306] R13: 00002afed8a00000 R14: 0000000000000200 R15: ffff880014150428 > > [ 2893.533699] FS: 0000000000000000(0000) GS:ffff88007f800000(0000) knlGS:0000000000000000 > > [ 2893.536250] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 2893.538309] CR2: 00002acb71513220 CR3: 0000000001c06000 CR4: 00000000001406f0 > > [ 2893.540777] Stack: > > [ 2893.542230] 8000000006c000e7 ffffea0001e55000 0000000000000001 ffffea00001b0000 > > [ 2893.544867] ffff88007c043e60 ffffffff811fb292 0000000000000000 0000000000000000 > > [ 2893.547490] ffff88007c036440 ffff88007c036440 ffff88007c036440 ffff88007c036440 > > [ 2893.550048] Call Trace: > > [ 2893.551498] [<ffffffff811fb292>] khugepaged+0x1552/0x25c0 > > [ 2893.553487] [<ffffffff810bfda0>] ? prepare_to_wait_event+0xf0/0xf0 > > [ 2893.555705] [<ffffffff811f9d40>] ? vmf_insert_pfn_pmd+0x170/0x170 > > [ 2893.557981] [<ffffffff81093b0e>] kthread+0xee/0x110 > > [ 2893.560040] [<ffffffff8172a17f>] ret_from_fork+0x1f/0x40 > > [ 2893.562302] [<ffffffff81093a20>] ? kthread_create_on_node+0x220/0x220 > > [ 2893.564690] Code: e8 2a e9 ff ff 5b 41 5c 41 5d 41 5e 5d c3 48 8b 43 20 a8 01 0f 85 37 ff ff ff c7 43 18 00 00 00 00 eb 9b 4c 89 e7 e8 f4 d1 fe ff <0f> 0b 48 83 e8 01 e9 07 ff ff ff 48 c7 c6 40 6b 9b 81 48 89 df > > [ 2893.572649] RIP [<ffffffff811ca46c>] page_add_new_anon_rmap+0x13c/0x180 > > [ 2893.574980] RSP <ffff88007c043ce8> > > [ 2893.583817] ---[ end trace 994b25e4ac8d495c ]--- > > [ 2893.585665] note: khugepaged[50] exited with preempt_count 1 > > ---------------------------------------- > > > > -- > > To unsubscribe, send a message with 'unsubscribe linux-mm' in > > the body to majordomo@xxxxxxxxx. For more info on Linux MM, > > see: http://www.linux-mm.org/ . > > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> > > -- > Michal Hocko > SUSE Labs -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>