Public bug reported:
After last update from kernel version 4.4.0-176-generic to 4.4.0-177-generic my
machine which does repository mirrors on NFS filesystem hung.
After hang the system is pingable, and all processes run well until they need
to perform IO operation. Then they end in 'D' state.
If dmesg -w -H is run prior to hang you could get following report:
[Apr22 16:06] INFO: task find:986 blocked for more than 120 seconds.
[ +0.000034] Not tainted 4.4.0-177-generic #207-Ubuntu
[ +0.000013] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ +0.000024] find D f4bbdd2c 0 986 721 0x00000000
[ +0.000010] f4bbdd1c 00000086 41ed78a0 f4bbdd2c eb5b7844 c1b36ec0 95907572
00000025
[ +0.000003] f4eb7e00 c1b1da80 f3ab6e00 f4bbe000 f3ab6e00 f53ae3a8 f4bbdd28
c17ec5cd
[ +0.000002] 000001ff f4bbdd78 c11a8b57 f4bbdd3c f87bb75b f76ae800 f4bbdd50
f87b2bdd
[ +0.000002] Call Trace:
[ +0.000006] [<c17ec5cd>] schedule+0x2d/0x80
[ +0.000012] [<c11a8b57>] kmap_high+0x117/0x290
[ +0.000013] [<f87bb75b>] ? nfs_revalidate_inode_rcu+0x1b/0x40 [nfs]
[ +0.000005] [<f87b2bdd>] ? nfs_check_verifier+0x6d/0x80 [nfs]
[ +0.000004] [<c11d2c95>] ? kmem_cache_alloc_trace+0x185/0x1e0
[ +0.000012] [<c109ee50>] ? wake_up_q+0x70/0x70
[ +0.000003] [<c106bec0>] kmap+0x40/0x50
[ +0.000006] [<f87b4e0d>] nfs_readdir_xdr_to_array+0xdd/0x370 [nfs]
[ +0.000005] [<f87b6835>] ? nfs4_lookup_revalidate+0x25/0x140 [nfs]
[ +0.000002] [<c11e4d62>] ? mem_cgroup_commit_charge+0x62/0xe0
[ +0.000011] [<f87b50bb>] nfs_readdir_filler+0x1b/0x80 [nfs]
[ +0.000002] [<c117e3b2>] do_read_cache_page+0x102/0x190
[ +0.000019] [<f87b50a0>] ? nfs_readdir_xdr_to_array+0x370/0x370 [nfs]
[ +0.000002] [<c117e464>] read_cache_page+0x24/0x30
[ +0.000004] [<f87b5261>] nfs_readdir+0x141/0x740 [nfs]
[ +0.000003] [<c13d21b6>] ? _copy_to_user+0x26/0x30
[ +0.000002] [<c135fba5>] ? common_file_perm+0x55/0x1b0
[ +0.000016] [<fbaac1c0>] ? nfs4_xdr_dec_fsinfo+0x80/0x80 [nfsv4]
[ +0.000003] [<c1201c2e>] iterate_dir+0x8e/0x130
[ +0.000002] [<c120bde2>] ? set_close_on_exec+0x62/0x70
[ +0.000002] [<c120224d>] SyS_getdents64+0x6d/0xf0
[ +0.000001] [<c1201e10>] ? filldir+0x140/0x140
[ +0.000002] [<c100397f>] do_fast_syscall_32+0x9f/0x190
[ +0.000011] [<c17f08b0>] sysenter_past_esp+0x3d/0x61
[ +0.000002] INFO: task bash:1065 blocked for more than 120 seconds.
[ +0.000015] Not tainted 4.4.0-177-generic #207-Ubuntu
[ +0.000020] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ +0.000018] bash D 00000017 0 1065 760 0x00000000
[ +0.000002] f1b87e44 00000086 c11a799b 00000017 00000000 f1f1eff8 b37c5095
00000025
[ +0.000003] f4eb7e00 c1b1da80 f3ab3c00 f1b88000 f3ab3c00 f53b0298 f1b87e50
c17ec5cd
[ +0.000002] 000001ff f1b87ea0 c11a8b57 f3ab3c00 f3131000 f3ab3c00 00000001
00000000
[ +0.000002] Call Trace:
[ +0.000003] [<c11a799b>] ? follow_page_mask+0x16b/0x290
[ +0.000001] [<c17ec5cd>] schedule+0x2d/0x80
[ +0.000001] [<c11a8b57>] kmap_high+0x117/0x290
[ +0.000002] [<c109ee50>] ? wake_up_q+0x70/0x70
[ +0.000001] [<c106bec0>] kmap+0x40/0x50
[ +0.000002] [<c11f4ae8>] copy_strings+0x1f8/0x2d0
[ +0.000002] [<c11f4be6>] copy_strings_kernel+0x26/0x30
[ +0.000001] [<c11f5b29>] do_execveat_common+0x479/0x6f0
[ +0.000002] [<c11fd62a>] ? getname_flags+0x3a/0x1a0
[ +0.000001] [<c11f5fb4>] SyS_execve+0x34/0x40
[ +0.000002] [<c100397f>] do_fast_syscall_32+0x9f/0x190
[ +0.000002] [<c17f08b0>] sysenter_past_esp+0x3d/0x61
I did NOT noticed such behaviour on x86_64 architecture, only on i386.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1874266
Title:
Intensive NFS operations could lock whole system
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