Hi all,
I am observing periodic crashes with signature below on kernel 4.4.26.
wb is extracted from page (see mm/page-writeback.c, void
account_page_dirtied() ):
inode_attach_wb(inode, page);
wb = inode_to_wb(inode);
We are crasing in
__inc_wb_stat(wb, WB_RECLAIMABLE), which calls __add_wb_stat(wb, item,
1), which then calls __percpu_counter_add(&wb->stat[item], amount,
WB_STAT_BATCH);
So actually the lock is:
wb->stat[WB_RECLAIMABLE].lock
[6716239.938412] BUG: unable to handle kernel paging request at 0000000000015e9a
[6716239.938782] IP: [<ffffffff8109b785>] queued_spin_lock_slowpath+0xe5/0x160
[6716239.939076] PGD 16b070067 PUD 2cea00067 PMD 0
[6716239.939485] Oops: 0002 [#1] SMP
[6716239.939834] Modules linked in: xt_multiport dm_snapshot
dm_thin_pool dm_bio_prison dm_persistent_data dm_bufio btrfs raid6_pq
xor loop iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat xt_CT iptable_raw nf_conntrack_ipv6 nf_defrag_ipv6
xt_state nf_conntrack ip6table_filter ip6_tables zfs(PO) zavl(PO)
zcommon(PO) znvpair(PO) spl(O) zunicode(PO) ext2 ib_umad sb_edac
edac_core i2c_i801 lpc_ich mfd_core shpchp ioatdma igb i2c_algo_bit
ses enclosure ipmi_devintf ipmi_si ipmi_msghandler tcp_scalable ib_qib
dca ib_mad ib_core ib_addr ipv6
[6716239.944558] CPU: 7 PID: 23338 Comm: btrfs Tainted: P W O
4.4.26-clouder1 #3
[6716239.944950] Hardware name: Supermicro X10DRi/X10DRi, BIOS 1.1 04/14/2015
[6716239.945184] task: ffff88046cec6e00 ti: ffff8801a8f1c000 task.ti:
ffff8801a8f1c000
[6716239.945570] RIP: 0010:[<ffffffff8109b785>] [<ffffffff8109b785>]
queued_spin_lock_slowpath+0xe5/0x160
[6716239.946025] RSP: 0018:ffff8801a8f1f9a8 EFLAGS: 00010006
[6716239.946253] RAX: 00000000000019bb RBX: ffff880466f363a0 RCX:
0000000000015e9a
[6716239.946639] RDX: ffff88047fcf5b00 RSI: 0000000000200000 RDI:
ffff880466f363a0
[6716239.947036] RBP: ffff8801a8f1f9a8 R08: 0000000000000001 R09:
0000000000000000
[6716239.947420] R10: ffff88026d966210 R11: 0000000000000000 R12:
0000000000000097
[6716239.947802] R13: 00000000fffffeff R14: ffff88017d5e1d68 R15:
ffff88047f881000
[6716239.952193] FS: 00007f99e3058880(0000) GS:ffff88047fce0000(0000)
knlGS:0000000000000000
[6716239.952582] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[6716239.952810] CR2: 0000000000015e9a CR3: 000000032bd3a000 CR4:
00000000001406e0
[6716239.953190] Stack:
[6716239.953407] ffff8801a8f1f9c8 ffffffff81614ed0 0000000000000102
ffff880466f363a0
[6716239.954038] ffff8801a8f1f9f0 ffffffff8131d1b0 ffff880466f36340
00000000ffffffff
[6716239.954669] ffffea000f44d640 ffff8801a8f1fa28 ffffffff811353a6
ffffea000f44d640
[6716239.955298] Call Trace:
[6716239.955521] [<ffffffff81614ed0>] _raw_spin_lock_irqsave+0x40/0x50
[6716239.955753] [<ffffffff8131d1b0>] __percpu_counter_add+0x40/0x70
[6716239.955982] [<ffffffff811353a6>] account_page_dirtied+0xb6/0x1a0
[6716239.956209] [<ffffffff81135511>] __set_page_dirty_nobuffers+0x81/0x140
[6716239.956458] [<ffffffffa0685cbe>] btrfs_set_page_dirty+0xe/0x10 [btrfs]
[6716239.956690] [<ffffffff8113455d>] set_page_dirty+0x3d/0x60
[6716239.956928] [<ffffffffa0696dc9>] btrfs_dirty_pages+0x79/0xa0 [btrfs]
[6716239.957184] [<ffffffffa06c7c5b>]
__btrfs_write_out_cache.isra.23+0x37b/0x420 [btrfs]
[6716239.957577] [<ffffffffa06c886a>] btrfs_write_out_cache+0x8a/0xf0 [btrfs]
[6716239.957816] [<ffffffffa067322d>]
btrfs_start_dirty_block_groups+0x1ed/0x3f0 [btrfs]
[6716239.958210] [<ffffffffa068415e>]
btrfs_commit_transaction+0x14e/0xa60 [btrfs]
[6716239.958602] [<ffffffffa0684b0a>] ? start_transaction+0x9a/0x4e0 [btrfs]
[6716239.958842] [<ffffffffa06b8a9e>] btrfs_mksubvol+0x4ce/0x4e0 [btrfs]
[6716239.959070] [<ffffffff81094580>] ? wait_woken+0xb0/0xb0
[6716239.959304] [<ffffffffa06b8c3f>]
btrfs_ioctl_snap_create_transid+0x18f/0x1a0 [btrfs]
[6716239.959707] [<ffffffffa06b8de7>]
btrfs_ioctl_snap_create_v2+0x107/0x170 [btrfs]
[6716239.960102] [<ffffffffa06bd5ca>] btrfs_ioctl+0x171a/0x2710 [btrfs]
[6716239.960330] [<ffffffff8115a252>] ? handle_mm_fault+0xca2/0x19c0
[6716239.960557] [<ffffffff811ac6bf>] do_vfs_ioctl+0x30f/0x560
[6716239.960786] [<ffffffff811ac989>] SyS_ioctl+0x79/0x90
[6716239.961012] [<ffffffff8161531b>] entry_SYSCALL_64_fastpath+0x16/0x6e
[6716239.961238] Code: 87 47 02 c1 e0 10 85 c0 74 3d 48 89 c1 c1 e8 12
48 c1 e9 0c 83 e8 01 83 e1 30 48 98 48 81 c1 00 5b 01 00 48 03 0c c5
40 d4 cd 81 <48> 89 11 8b 42 08 85 c0 75 12 f3 90 8b 42 08 85 c0 74 f7
8b 0f
[6716239.965810] RIP [<ffffffff8109b785>] queued_spin_lock_slowpath+0xe5/0x160
[6716239.966100] RSP <ffff8801a8f1f9a8>
[6716239.966319] CR2: 0000000000015e9a
Has someone seen something like that ?
Best regards,
Angel
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