From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 665EA1F12F2 for ; Tue, 3 Dec 2024 14:18:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733235534; cv=none; b=e4vYazL4305Lc8khBMS75bbLC51cdmF1BNIybI0SbV5AbC3Cb2ETBvM5IcQHi9VOIyjle9B/3Nj+8zOt5oa9qMcUIBbdaEmhDDi3j/7EUHtPpN4tgASSZkOUPv4dA3WcZQMP9IRqXUpL46/7UwGBuo3WSFB/oHTmweLRdrJ7kbY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733235534; c=relaxed/simple; bh=TFT8aSYsO2F27bkkmrEOq47o4Vwj6JnZft8LrYUOABE=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=f8v/DBWnrJZqR5O7On81Yx4feBvDMTKh10rXM8zSDd6h9+od1pG5uMTw4DX6Mc1KQRsmKyy4+t3/P97yIiV4cG4lTLOgUH3tz/xXIrsLZwslykK0/j/k5gPbC0iHIIrYRY3iPoId5/l/rhD5vtpITVfwtuVJDPlQx2g+0KvHcZs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lqam+EZy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lqam+EZy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 76088C4CECF; Tue, 3 Dec 2024 14:18:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733235533; bh=TFT8aSYsO2F27bkkmrEOq47o4Vwj6JnZft8LrYUOABE=; h=Subject:From:To:Date:In-Reply-To:References:From; b=lqam+EZypUWE0lCubNgZw8wcygZXiEUcbcYBFm0UyRZBvOJPVmilNWbwNGpDOdukD wKZ1jrPI5/j31OWpfRq6qHpxsBpgCbqtlUs02nTUZkWPPvKE1gS9GAD/ONS16cPFpf yKYIfQhv5GIm9VmFiGduRAxvcngRLqbIesn5aNlwu6udcGmryusYl5M/YI99ibS6up KeDWxaigGlsUsH3jSkxZMAaP9trAVPaTP/sHSdaQNGnxl4MGOFgHmjS2TXssS0ZwRW lz3h7zC252AQibXrC/hqmynce7SpURpRYEfKfPyWMvpT4K1lqQm15gvpe4RHar5H2R 8rAadJZwk73yg== Message-ID: <3fd8e0681020f95832fadf9da7fa4de4d51efaed.camel@kernel.org> Subject: Re: deploying both NFS client and server on the same machine triggle hungtask From: Jeff Layton To: Li Lingfeng via Bugspray Bot , anna@kernel.org, linux-nfs@vger.kernel.org, trondmy@kernel.org, cel@kernel.org Date: Tue, 03 Dec 2024 06:18:52 -0800 In-Reply-To: <20241203-b219550c0-abf5589a5df5@bugzilla.kernel.org> References: <20241203-b219550c0-abf5589a5df5@bugzilla.kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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writes via Kernel.org Bugzilla: >=20 > We deployed the client and server on the same machine for some testing, w= hich caused some processes to trigger hungtask. Note that this is really an unsupported configuration. It's very difficult to prevent a situation where the server needs memory in order to handle an RPC from the local client, and then tries to write back dirty NFS client pages in order to get it. Instant deadlock. That kind of configuration is fine for basic functionality testing, but once you start getting into memory pressure, it can fall over pretty quickly. Can you hit the same problem below with the client and server on different machines? > Among them, processes 1/234577 are waiting for shrinker_rwsem, and proces= ses 234303/234377/234550/234560/234574/234575/234576/234578 are waiting for= nfsd_mutex. > According to the information in the vmcore, process 234291 holds shrinker= _rwsem, causing process 1/234577 to trigger hungtask, and process 234577 is= holding nfsd_mutex while waiting for shrinker_rwsem, causing other process= es to trigger hungtask. >=20 > crash> p nfsd_mutex.owner > $4 =3D { > counter =3D -131387141472191 > } > crash> task_struct.comm ffff88810c1ac040 > comm =3D "bash\000d\000ter\000\000\000\000\000", > crash> task_struct.pid ffff88810c1ac040 > pid =3D 234577, > crash> > crash> p shrinker_rwsem.owner > $2 =3D { > counter =3D -131387117846463 > } > crash> task_struct.comm ffff88810d834040 > comm =3D "bash\000d\000ter\000\000\000\000\000", > crash> task_struct.pid ffff88810d834040 > pid =3D 234291, > crash> bt 234291 > PID: 234291 TASK: ffff88810d834040 CPU: 2 COMMAND: "bash" > #0 [ffffc90003f673e8] __schedule at ffffffff92a42326 > #1 [ffffc90003f674e8] schedule at ffffffff92a42c98 > #2 [ffffc90003f67510] rpc_wait_bit_killable at ffffffff928a24cc > #3 [ffffc90003f67530] __wait_on_bit at ffffffff92a434a8 > #4 [ffffc90003f67588] out_of_line_wait_on_bit at ffffffff92a4366a > #5 [ffffc90003f67638] _nfs4_proc_delegreturn at ffffffff91b037c5 > #6 [ffffc90003f677b8] nfs4_proc_delegreturn at ffffffff91b1af73 > #7 [ffffc90003f678a0] nfs_do_return_delegation at ffffffff91b43aeb > #8 [ffffc90003f678d0] nfs_inode_evict_delegation at ffffffff91b45a5e > #9 [ffffc90003f678f0] nfs4_evict_inode at ffffffff91b40676 > #10 [ffffc90003f67908] evict at ffffffff918b19e1 > #11 [ffffc90003f67950] dispose_list at ffffffff918b1c2e > #12 [ffffc90003f67988] prune_icache_sb at ffffffff918b4442 > #13 [ffffc90003f67a18] super_cache_scan at ffffffff9187e854 > #14 [ffffc90003f67a80] do_shrink_slab at ffffffff916d5a0e > #15 [ffffc90003f67b10] shrink_slab at ffffffff916db1f6 > #16 [ffffc90003f67bd8] drop_slab_node at ffffffff916db30f > #17 [ffffc90003f67c10] drop_slab at ffffffff916db3b8 > #18 [ffffc90003f67c28] drop_caches_sysctl_handler at ffffffff91962da6 > #19 [ffffc90003f67c48] proc_sys_call_handler at ffffffff919a595a > #20 [ffffc90003f67d18] new_sync_write at ffffffff918738ed > #21 [ffffc90003f67e60] vfs_write at ffffffff91878d0e > #22 [ffffc90003f67ea8] ksys_write at ffffffff918793c9 > #23 [ffffc90003f67f40] do_syscall_64 at ffffffff92a2e190 > #24 [ffffc90003f67f50] entry_SYSCALL_64_after_hwframe at ffffffff92c0011f > RIP: 00007fe96d5fef07 RSP: 00007fff59407f28 RFLAGS: 00000246 > RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fe96d5fef07 > RDX: 0000000000000002 RSI: 000055bad3d218b0 RDI: 0000000000000001 > RBP: 000055bad3d218b0 R8: 00007fe96d6b3000 R9: 00007fe96d6b3080 > R10: 00007fe96d6b2f80 R11: 0000000000000246 R12: 0000000000000002 > R13: 00007fe96d6f45a0 R14: 0000000000000002 R15: 00007fe96d6f47a0 > ORIG_RAX: 0000000000000001 CS: 0033 SS: 002b > crash> >=20 > This is our analysis of the cause: > https://lore.kernel.org/all/887cd8f6-3e49-410c-8b36-9e617c34ca6f@huawei.c= om/ >=20 That's a little different from the usual situation of the server trying to clean dirty NFS pagecache, but it seems like a similar sort of problem. > The log is as follows: >=20 > [ 6340.366469] bash (158426): drop_caches: 3 > [ 6342.199660] NFSD: Using nfsdcld client tracking operations. > [ 6342.201199] NFSD: starting 20-second grace period (net f0000098) > [ 6343.714137] NFSD: all clients done reclaiming, ending NFSv4 grace peri= od (net f0000098) > [ 6383.434249] EXT4-fs (sdb): unmounting filesystem 8ec30df4-38d5-4310-88= db-b7f543dd479e. > [ 6385.878329] EXT4-fs (sdb): mounted filesystem 8ec30df4-38d5-4310-88db-= b7f543dd479e r/w with ordered data mode. > Opts: (null) > [ 6388.163185] NFSD: Using nfsdcld client tracking operations. > [ 6388.165153] NFSD: no clients to reclaim, skipping NFSv4 grace period (= net f0000098) > [ 6395.863853] bash (234291): drop_caches: 3 > [ 6404.878651] [start] do_inject: net_random_error > [ 6404.881067] [start] do_inject: net_delay lo 128.0.0.1/8 > [ 8624.939535] INFO: task systemd:1 blocked for more than 1212 seconds. > [ 8624.941432] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 5.10.0 is quite old at this point. Is this reproducible on more recent upstream kernels? > [ 8624.943087] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8624.945068] task:systemd state:D stack: 0 pid: 1 ppid: = 0 flags:0x00000000 > [ 8624.947201] Call Trace: > [ 8624.948011] __schedule+0x726/0x1010 > [ 8624.949065] ? io_schedule_timeout+0xb0/0xb0 > [ 8624.950261] ? mark_held_locks+0x65/0x90 > [ 8624.951345] schedule+0x88/0x1a0 > [ 8624.952326] rwsem_down_write_slowpath+0x460/0xa60 > [ 8624.953662] ? rwsem_optimistic_spin+0x400/0x400 > [ 8624.954944] ? lock_acquire+0x15a/0x3a0 > [ 8624.956325] ? alloc_shrinker_info+0x23/0x150 > [ 8624.958516] ? lock_release+0x150/0x150 > [ 8624.960230] down_write+0x135/0x140 > [ 8624.961843] ? down_write_killable_nested+0x170/0x170 > [ 8624.963790] ? __lock_release+0x12f/0x290 > [ 8624.964935] ? mark_lock+0x8f/0x6a0 > [ 8624.965937] alloc_shrinker_info+0x23/0x150 > [ 8624.967073] mem_cgroup_css_online+0x15/0x2e0 > [ 8624.968299] online_css+0x4c/0x120 > [ 8624.969301] css_create+0x2e7/0x3d0 > [ 8624.970339] cgroup_apply_control_enable+0x219/0x290 > [ 8624.971693] cgroup_mkdir+0x163/0x2b0 > [ 8624.972750] ? cgroup_destroy_locked+0x3c0/0x3c0 > [ 8624.974022] kernfs_iop_mkdir+0x9e/0xd0 > [ 8624.975078] vfs_mkdir+0x269/0x370 > [ 8624.976061] do_mkdirat+0x1b5/0x1f0 > [ 8624.977073] ? __ia32_sys_mknod+0x50/0x50 > [ 8624.978204] ? lockdep_hardirqs_on_prepare.part.0+0xf9/0x1c0 > [ 8624.979674] ? syscall_enter_from_user_mode+0x27/0x80 > [ 8624.981038] do_syscall_64+0x30/0x40 > [ 8624.982055] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8624.983392] RIP: 0033:0x7f8c9732badb > [ 8624.984374] RSP: 002b:00007fff39f84bb8 EFLAGS: 00000206 ORIG_RAX: 0000= 000000000053 > [ 8624.986229] RAX: ffffffffffffffda RBX: 000055a78a1a50a0 RCX: 00007f8c9= 732badb > [ 8624.988015] RDX: 0000000000000000 RSI: 00000000000001ed RDI: 000055a78= a0fe1d0 > [ 8624.989816] RBP: 00007f8c977797aa R08: 0000000000000022 R09: 000000000= 0000000 > [ 8624.991614] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000= 0000000 > [ 8624.993417] R13: 00000000000000e0 R14: 000055a78a1a50a0 R15: 000000000= 0000001 > [ 8624.995555] INFO: task bash:234303 blocked for more than 1212 seconds. > [ 8624.997233] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8624.998851] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.000815] task:bash state:D stack: 0 pid:234303 ppid: = 531 flags:0x00000084 > [ 8625.002930] Call Trace: > [ 8625.003728] __schedule+0x726/0x1010 > [ 8625.004777] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.006001] schedule+0x88/0x1a0 > [ 8625.006962] schedule_preempt_disabled+0x11/0x20 > [ 8625.008200] __mutex_lock+0x3d4/0xc50 > [ 8625.009250] ? write_versions+0x21/0x60 > [ 8625.010348] ? mutex_trylock+0x180/0x180 > [ 8625.011462] ? lock_downgrade+0x90/0x90 > [ 8625.012583] ? should_fail_ex+0x7f/0x2c0 > [ 8625.013709] write_versions+0x21/0x60 > [ 8625.014770] ? __write_versions.isra.0+0x620/0x620 > [ 8625.016077] nfsctl_transaction_write+0x70/0xa0 > [ 8625.017326] vfs_write+0x141/0x520 > [ 8625.018332] ksys_write+0xc9/0x170 > [ 8625.019330] ? __ia32_sys_read+0x50/0x50 > [ 8625.020444] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.021778] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.023172] do_syscall_64+0x30/0x40 > [ 8625.024196] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.025544] RIP: 0033:0x7fe96d5fef07 > [ 8625.026549] RSP: 002b:00007fff59407c68 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000001 > [ 8625.028438] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fe96= d5fef07 > [ 8625.030238] RDX: 0000000000000003 RSI: 000055bad3d218b0 RDI: 000000000= 0000001 > [ 8625.032046] RBP: 000055bad3d218b0 R08: 00007fe96d6b3000 R09: 00007fe96= d6b3080 > [ 8625.033887] R10: 00007fe96d6b2f80 R11: 0000000000000246 R12: 000000000= 0000003 > [ 8625.035685] R13: 00007fe96d6f45a0 R14: 0000000000000003 R15: 00007fe96= d6f47a0 > [ 8625.037542] INFO: task bash:234377 blocked for more than 1212 seconds. > [ 8625.039217] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8625.040817] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.042777] task:bash state:D stack: 0 pid:234377 ppid: = 531 flags:0x00000084 > [ 8625.044876] Call Trace: > [ 8625.045683] __schedule+0x726/0x1010 > [ 8625.046733] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.047965] schedule+0x88/0x1a0 > [ 8625.048920] schedule_preempt_disabled+0x11/0x20 > [ 8625.050168] __mutex_lock+0x3d4/0xc50 > [ 8625.051221] ? write_versions+0x21/0x60 > [ 8625.052313] ? mutex_trylock+0x180/0x180 > [ 8625.053414] ? lock_downgrade+0x90/0x90 > [ 8625.054536] ? should_fail_ex+0x7f/0x2c0 > [ 8625.055675] write_versions+0x21/0x60 > [ 8625.056738] ? __write_versions.isra.0+0x620/0x620 > [ 8625.058025] nfsctl_transaction_write+0x70/0xa0 > [ 8625.059270] vfs_write+0x141/0x520 > [ 8625.060276] ksys_write+0xc9/0x170 > [ 8625.061287] ? __ia32_sys_read+0x50/0x50 > [ 8625.062399] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.063728] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.065106] do_syscall_64+0x30/0x40 > [ 8625.066169] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.067533] RIP: 0033:0x7fe96d5fef07 > [ 8625.068577] RSP: 002b:00007fff59407c68 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000001 > [ 8625.070535] RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 00007fe96= d5fef07 > [ 8625.072365] RDX: 0000000000000013 RSI: 000055bad3d218b0 RDI: 000000000= 0000001 > [ 8625.074190] RBP: 000055bad3d218b0 R08: 00007fe96d6b3000 R09: 00007fe96= d6b3080 > [ 8625.076022] R10: 00007fe96d6b2f80 R11: 0000000000000246 R12: 000000000= 0000013 > [ 8625.077851] R13: 00007fe96d6f45a0 R14: 0000000000000013 R15: 00007fe96= d6f47a0 > [ 8625.079730] INFO: task bash:234550 blocked for more than 1212 seconds. > [ 8625.081437] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8625.083279] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.085276] task:bash state:D stack: 0 pid:234550 ppid: = 531 flags:0x00000080 > [ 8625.087399] Call Trace: > [ 8625.088201] __schedule+0x726/0x1010 > [ 8625.089255] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.090438] schedule+0x88/0x1a0 > [ 8625.091395] schedule_preempt_disabled+0x11/0x20 > [ 8625.092648] __mutex_lock+0x3d4/0xc50 > [ 8625.093656] ? nfsd_svc+0xc6/0x3c0 > [ 8625.094665] ? mutex_trylock+0x180/0x180 > [ 8625.095767] ? __lock_release+0x12f/0x290 > [ 8625.096912] ? lock_downgrade+0x90/0x90 > [ 8625.098013] ? _parse_integer_limit+0xb1/0xd0 > [ 8625.099229] ? simple_strtol+0xb0/0x140 > [ 8625.100332] ? nfsd_svc+0x99/0x3c0 > [ 8625.101328] nfsd_svc+0xc6/0x3c0 > [ 8625.102311] write_threads+0x134/0x1d0 > [ 8625.103379] ? write_pool_threads+0x340/0x340 > [ 8625.104601] ? should_fail_ex+0x7f/0x2c0 > [ 8625.105715] ? _copy_from_user+0xa0/0xf0 > [ 8625.106819] ? write_pool_threads+0x340/0x340 > [ 8625.108025] nfsctl_transaction_write+0x70/0xa0 > [ 8625.109257] vfs_write+0x141/0x520 > [ 8625.110252] ksys_write+0xc9/0x170 > [ 8625.111239] ? __ia32_sys_read+0x50/0x50 > [ 8625.112344] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.113673] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.115035] do_syscall_64+0x30/0x40 > [ 8625.116056] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.117402] RIP: 0033:0x7fe96d5fef07 > [ 8625.118421] RSP: 002b:00007fff594080b8 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000001 > [ 8625.120334] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fe96= d5fef07 > [ 8625.122149] RDX: 0000000000000002 RSI: 000055bad3d218b0 RDI: 000000000= 0000001 > [ 8625.123941] RBP: 000055bad3d218b0 R08: 00007fe96d6b3000 R09: 00007fe96= d6b3080 > [ 8625.125672] R10: 00007fe96d6b2f80 R11: 0000000000000246 R12: 000000000= 0000002 > [ 8625.127465] R13: 00007fe96d6f45a0 R14: 0000000000000002 R15: 00007fe96= d6f47a0 > [ 8625.129282] INFO: task cat:234560 blocked for more than 1212 seconds. > [ 8625.130946] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8625.132572] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.134518] task:cat state:D stack: 0 pid:234560 ppid:2= 34557 flags:0x00000080 > [ 8625.136570] Call Trace: > [ 8625.137367] __schedule+0x726/0x1010 > [ 8625.138430] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.139661] schedule+0x88/0x1a0 > [ 8625.140671] schedule_preempt_disabled+0x11/0x20 > [ 8625.141950] __mutex_lock+0x3d4/0xc50 > [ 8625.143026] ? write_versions+0x21/0x60 > [ 8625.144177] ? mutex_trylock+0x180/0x180 > [ 8625.145264] ? lock_downgrade+0x90/0x90 > [ 8625.146399] ? should_fail_ex+0x7f/0x2c0 > [ 8625.147546] write_versions+0x21/0x60 > [ 8625.148605] ? __write_versions.isra.0+0x620/0x620 > [ 8625.149911] nfsctl_transaction_write+0x70/0xa0 > [ 8625.151182] nfsctl_transaction_read+0x56/0x70 > [ 8625.152431] vfs_read+0x111/0x2c0 > [ 8625.153433] ksys_read+0xc9/0x170 > [ 8625.154409] ? __ia32_sys_pwrite64+0x140/0x140 > [ 8625.155630] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.156970] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.158340] do_syscall_64+0x30/0x40 > [ 8625.159364] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.160719] RIP: 0033:0x7fa1f7b1be62 > [ 8625.161750] RSP: 002b:00007ffda25a6298 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000000 > [ 8625.163670] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007fa1f= 7b1be62 > [ 8625.165479] RDX: 0000000000020000 RSI: 00007fa1f79fb000 RDI: 000000000= 0000003 > [ 8625.167290] RBP: 00007fa1f79fb000 R08: 00000000ffffffff R09: 000000000= 0000000 > [ 8625.169089] R10: 0000000000000022 R11: 0000000000000246 R12: 000000000= 0020000 > [ 8625.170895] R13: 0000000000000003 R14: 0000000000000000 R15: 000055567= 631ea58 > [ 8625.172768] INFO: task cat:234574 blocked for more than 1212 seconds. > [ 8625.174450] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8625.176061] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.178026] task:cat state:D stack: 0 pid:234574 ppid:2= 34564 flags:0x00000080 > [ 8625.180103] Call Trace: > [ 8625.180909] __schedule+0x726/0x1010 > [ 8625.181984] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.183219] schedule+0x88/0x1a0 > [ 8625.184186] schedule_preempt_disabled+0x11/0x20 > [ 8625.185429] __mutex_lock+0x3d4/0xc50 > [ 8625.186477] ? write_versions+0x21/0x60 > [ 8625.187578] ? mutex_trylock+0x180/0x180 > [ 8625.188689] ? lock_downgrade+0x90/0x90 > [ 8625.189811] ? should_fail_ex+0x7f/0x2c0 > [ 8625.190938] write_versions+0x21/0x60 > [ 8625.191987] ? __write_versions.isra.0+0x620/0x620 > [ 8625.193260] nfsctl_transaction_write+0x70/0xa0 > [ 8625.194488] nfsctl_transaction_read+0x56/0x70 > [ 8625.195700] vfs_read+0x111/0x2c0 > [ 8625.196685] ksys_read+0xc9/0x170 > [ 8625.197649] ? __ia32_sys_pwrite64+0x140/0x140 > [ 8625.198852] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.200168] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.201502] do_syscall_64+0x30/0x40 > [ 8625.202530] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.203880] RIP: 0033:0x7f8e1a01de62 > [ 8625.204887] RSP: 002b:00007ffd2027f508 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000000 > [ 8625.206784] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f8e1= a01de62 > [ 8625.208576] RDX: 0000000000020000 RSI: 00007f8e19efd000 RDI: 000000000= 0000003 > [ 8625.210361] RBP: 00007f8e19efd000 R08: 00000000ffffffff R09: 000000000= 0000000 > [ 8625.212156] R10: 0000000000000022 R11: 0000000000000246 R12: 000000000= 0020000 > [ 8625.213952] R13: 0000000000000003 R14: 0000000000000000 R15: 000055c46= bacaa58 > [ 8625.215931] INFO: task cat:234575 blocked for more than 1212 seconds. > [ 8625.217722] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8625.219420] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.221498] task:cat state:D stack: 0 pid:234575 ppid:2= 34570 flags:0x00000080 > [ 8625.223710] Call Trace: > [ 8625.224559] __schedule+0x726/0x1010 > [ 8625.225668] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.226968] schedule+0x88/0x1a0 > [ 8625.227981] schedule_preempt_disabled+0x11/0x20 > [ 8625.229320] __mutex_lock+0x3d4/0xc50 > [ 8625.230449] ? nfsd_pool_stats_open+0xea/0x2b0 > [ 8625.231752] ? mutex_trylock+0x180/0x180 > [ 8625.232921] ? __lock_release+0x12f/0x290 > [ 8625.234109] ? lock_downgrade+0x90/0x90 > [ 8625.235256] ? apparmor_file_alloc_security+0x530/0x530 > [ 8625.236748] ? do_raw_spin_lock+0x11a/0x1b0 > [ 8625.238006] ? nfsd_pool_stats_open+0xb6/0x2b0 > [ 8625.239287] nfsd_pool_stats_open+0xea/0x2b0 > [ 8625.240556] do_dentry_open+0x2cc/0x760 > [ 8625.241720] ? nfssvc_encode_voidres+0x10/0x10 > [ 8625.243044] do_open+0x2bb/0x4b0 > [ 8625.244070] path_openat+0x1c8/0x2d0 > [ 8625.245179] ? do_tmpfile+0x1e0/0x1e0 > [ 8625.246290] ? __lock_acquire+0x537/0x940 > [ 8625.247508] do_filp_open+0x125/0x240 > [ 8625.248617] ? may_open_dev+0x50/0x50 > [ 8625.249764] ? page_counter_try_charge+0x4e/0x110 > [ 8625.251160] ? files_cgroup_alloc_fd+0xdb/0xf0 > [ 8625.252431] ? files_cgroup_unalloc_fd+0x60/0x60 > [ 8625.253774] ? do_raw_spin_unlock+0x99/0x100 > [ 8625.255058] ? _raw_spin_unlock+0x1f/0x30 > [ 8625.256242] ? alloc_fd+0x1b1/0x330 > [ 8625.257331] do_sys_openat2+0x2ca/0x470 > [ 8625.258496] ? file_open_root+0x210/0x210 > [ 8625.259680] ? syscall_trace_enter.constprop.0+0x158/0x1e0 > [ 8625.261211] ? lock_downgrade+0x90/0x90 > [ 8625.262364] ? __ia32_compat_sys_newfstatat+0x60/0x60 > [ 8625.263790] ? up_read+0x18c/0x500 > [ 8625.264862] __x64_sys_openat+0xce/0x140 > [ 8625.266035] ? __x64_sys_open+0x130/0x130 > [ 8625.267222] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.268638] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.270081] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.271509] do_syscall_64+0x30/0x40 > [ 8625.272597] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.274022] RIP: 0033:0x7faa0f5dfbbb > [ 8625.275108] RSP: 002b:00007fff5377ece0 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000101 > [ 8625.277183] RAX: ffffffffffffffda RBX: 0000562156c4863c RCX: 00007faa0= f5dfbbb > [ 8625.279086] RDX: 0000000000000000 RSI: 00007fff53780d14 RDI: 00000000f= fffff9c > [ 8625.281010] RBP: 00007fff53780d14 R08: 0000000000000000 R09: 000000000= 0000000 > [ 8625.282912] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000= 0000000 > [ 8625.284804] R13: 0000000000020000 R14: 00007faa0f71fa80 R15: 000056215= 6c4ba58 > [ 8625.286783] INFO: task cat:234576 blocked for more than 1212 seconds. > [ 8625.288532] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8625.290232] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.292311] task:cat state:D stack: 0 pid:234576 ppid:2= 34561 flags:0x00000080 > [ 8625.294542] Call Trace: > [ 8625.295378] __schedule+0x726/0x1010 > [ 8625.296500] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.297792] schedule+0x88/0x1a0 > [ 8625.298810] schedule_preempt_disabled+0x11/0x20 > [ 8625.300161] __mutex_lock+0x3d4/0xc50 > [ 8625.301272] ? nfsd_nrthreads+0xbf/0x210 > [ 8625.302453] ? mutex_trylock+0x180/0x180 > [ 8625.303626] ? __lock_release+0x12f/0x290 > [ 8625.304813] ? lock_downgrade+0x90/0x90 > [ 8625.305997] ? nfsd_nrthreads+0x8f/0x210 > [ 8625.307191] nfsd_nrthreads+0xbf/0x210 > [ 8625.308269] write_threads+0x146/0x1d0 > [ 8625.309391] ? write_pool_threads+0x340/0x340 > [ 8625.310620] ? should_fail_ex+0x7f/0x2c0 > [ 8625.311777] ? _copy_from_user+0xa0/0xf0 > [ 8625.312955] ? write_pool_threads+0x340/0x340 > [ 8625.314223] nfsctl_transaction_write+0x70/0xa0 > [ 8625.315534] nfsctl_transaction_read+0x56/0x70 > [ 8625.316837] vfs_read+0x111/0x2c0 > [ 8625.317889] ksys_read+0xc9/0x170 > [ 8625.318921] ? __ia32_sys_pwrite64+0x140/0x140 > [ 8625.320216] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.321624] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.323076] do_syscall_64+0x30/0x40 > [ 8625.324175] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.325590] RIP: 0033:0x7f3d2aa48e62 > [ 8625.326667] RSP: 002b:00007ffcc44e5228 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000000 > [ 8625.328700] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f3d2= aa48e62 > [ 8625.330592] RDX: 0000000000020000 RSI: 00007f3d2a928000 RDI: 000000000= 0000003 > [ 8625.332491] RBP: 00007f3d2a928000 R08: 00000000ffffffff R09: 000000000= 0000000 > [ 8625.334404] R10: 0000000000000022 R11: 0000000000000246 R12: 000000000= 0020000 > [ 8625.336301] R13: 0000000000000003 R14: 0000000000000000 R15: 00005633d= effda58 > [ 8625.338267] INFO: task bash:234577 blocked for more than 1212 seconds. > [ 8625.340034] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8625.341716] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.343756] task:bash state:D stack: 0 pid:234577 ppid:2= 34550 flags:0x00004082 > [ 8625.345963] Call Trace: > [ 8625.346789] __schedule+0x726/0x1010 > [ 8625.347888] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.349163] ? mark_held_locks+0x65/0x90 > [ 8625.350340] schedule+0x88/0x1a0 > [ 8625.351354] rwsem_down_write_slowpath+0x460/0xa60 > [ 8625.352740] ? rwsem_optimistic_spin+0x400/0x400 > [ 8625.354097] ? lock_acquire+0x15a/0x3a0 > [ 8625.355255] ? unregister_shrinker+0x47/0x120 > [ 8625.356538] ? lock_release+0x150/0x150 > [ 8625.357748] down_write+0x135/0x140 > [ 8625.358828] ? down_write_killable_nested+0x170/0x170 > [ 8625.360266] ? find_held_lock+0x85/0xa0 > [ 8625.361430] unregister_shrinker+0x47/0x120 > [ 8625.362666] nfs4_state_shutdown_net+0x128/0x410 > [ 8625.364001] ? rpc_shutdown_client+0x108/0x270 > [ 8625.365269] ? nfs4_state_start+0x70/0x70 > [ 8625.366443] ? rpcb_put_local+0x13e/0x2a0 > [ 8625.367613] ? nfsd_shutdown_net+0x8f/0x250 > [ 8625.368842] nfsd_shutdown_net+0xbd/0x250 > [ 8625.370019] nfsd_last_thread+0x160/0x2a0 > [ 8625.371192] nfsd_svc+0x393/0x3c0 > [ 8625.372209] write_threads+0x134/0x1d0 > [ 8625.373315] ? write_pool_threads+0x340/0x340 > [ 8625.374590] ? should_fail_ex+0x7f/0x2c0 > [ 8625.375749] ? _copy_from_user+0xa0/0xf0 > [ 8625.376911] ? write_pool_threads+0x340/0x340 > [ 8625.378163] nfsctl_transaction_write+0x70/0xa0 > [ 8625.379447] vfs_write+0x141/0x520 > [ 8625.380495] ksys_write+0xc9/0x170 > [ 8625.381521] ? __ia32_sys_read+0x50/0x50 > [ 8625.382670] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.384058] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.385502] do_syscall_64+0x30/0x40 > [ 8625.386588] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.388003] RIP: 0033:0x7fe96d5fef07 > [ 8625.389065] RSP: 002b:00007fff59408048 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000001 > [ 8625.391099] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fe96= d5fef07 > [ 8625.393014] RDX: 0000000000000002 RSI: 000055bad3d218b0 RDI: 000000000= 0000001 > [ 8625.394923] RBP: 000055bad3d218b0 R08: 00007fe96d6b3000 R09: 00007fe96= d6b3080 > [ 8625.396833] R10: 00007fe96d6b2f80 R11: 0000000000000246 R12: 000000000= 0000002 > [ 8625.398737] R13: 00007fe96d6f45a0 R14: 0000000000000002 R15: 00007fe96= d6f47a0 > [ 8625.400743] INFO: task cat:234578 blocked for more than 1212 seconds. > [ 8625.402472] Not tainted 5.10.0-00574-gc310db27923f-dirty #159 > [ 8625.404213] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable= s this message. > [ 8625.406275] task:cat state:D stack: 0 pid:234578 ppid:2= 34556 flags:0x00000080 > [ 8625.408493] Call Trace: > [ 8625.409341] __schedule+0x726/0x1010 > [ 8625.410447] ? io_schedule_timeout+0xb0/0xb0 > [ 8625.411726] schedule+0x88/0x1a0 > [ 8625.412739] schedule_preempt_disabled+0x11/0x20 > [ 8625.414076] __mutex_lock+0x3d4/0xc50 > [ 8625.415181] ? nfsd_pool_stats_open+0xea/0x2b0 > [ 8625.416469] ? mutex_trylock+0x180/0x180 > [ 8625.417662] ? __lock_release+0x12f/0x290 > [ 8625.418857] ? lock_downgrade+0x90/0x90 > [ 8625.420020] ? apparmor_file_alloc_security+0x530/0x530 > [ 8625.421497] ? do_raw_spin_lock+0x11a/0x1b0 > [ 8625.422732] ? nfsd_pool_stats_open+0xb6/0x2b0 > [ 8625.424036] nfsd_pool_stats_open+0xea/0x2b0 > [ 8625.425288] do_dentry_open+0x2cc/0x760 > [ 8625.426437] ? nfssvc_encode_voidres+0x10/0x10 > [ 8625.427747] do_open+0x2bb/0x4b0 > [ 8625.428773] path_openat+0x1c8/0x2d0 > [ 8625.429877] ? do_tmpfile+0x1e0/0x1e0 > [ 8625.431003] ? __lock_acquire+0x537/0x940 > [ 8625.432228] do_filp_open+0x125/0x240 > [ 8625.433348] ? may_open_dev+0x50/0x50 > [ 8625.434506] ? page_counter_try_charge+0x4e/0x110 > [ 8625.435881] ? files_cgroup_alloc_fd+0xdb/0xf0 > [ 8625.437183] ? files_cgroup_unalloc_fd+0x60/0x60 > [ 8625.438543] ? do_raw_spin_unlock+0x99/0x100 > [ 8625.439807] ? _raw_spin_unlock+0x1f/0x30 > [ 8625.440996] ? alloc_fd+0x1b1/0x330 > [ 8625.442091] do_sys_openat2+0x2ca/0x470 > [ 8625.443254] ? file_open_root+0x210/0x210 > [ 8625.444463] ? syscall_trace_enter.constprop.0+0x158/0x1e0 > [ 8625.445994] ? lock_downgrade+0x90/0x90 > [ 8625.447156] ? __ia32_compat_sys_newfstatat+0x60/0x60 > [ 8625.448590] ? up_read+0x18c/0x500 > [ 8625.449661] __x64_sys_openat+0xce/0x140 > [ 8625.450839] ? __x64_sys_open+0x130/0x130 > [ 8625.452030] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.453438] ? ktime_get_coarse_real_ts64+0xfe/0x110 > [ 8625.454834] ? ktime_get_coarse_real_ts64+0xa2/0x110 > [ 8625.456262] do_syscall_64+0x30/0x40 > [ 8625.457350] entry_SYSCALL_64_after_hwframe+0x67/0xd1 > [ 8625.458771] RIP: 0033:0x7f8928fdebbb > [ 8625.459860] RSP: 002b:00007ffe1206d900 EFLAGS: 00000246 ORIG_RAX: 0000= 000000000101 > [ 8625.461864] RAX: ffffffffffffffda RBX: 0000562cbd47263c RCX: 00007f892= 8fdebbb > [ 8625.463784] RDX: 0000000000000000 RSI: 00007ffe1206fd14 RDI: 00000000f= fffff9c > [ 8625.465681] RBP: 00007ffe1206fd14 R08: 0000000000000000 R09: 000000000= 0000000 > [ 8625.467577] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000= 0000000 > [ 8625.469443] R13: 0000000000020000 R14: 00007f892911ea80 R15: 0000562cb= d475a58 > [ 8625.471499] > Showing all locks held in the system: > [ 8625.473315] 4 locks held by systemd/1: > [ 8625.474375] #0: ffff888114161438 (sb_writers#8){.+.+}-{0:0}, at: file= name_create+0xbf/0x260 > [ 8625.476573] #1: ffff8881145253d8 (&type->i_mutex_dir_key#6/1){+.+.}-{= 3:3}, at: filename_create+0xf7/0x260 > [ 8625.479010] #2: ffffffff946870e8 (cgroup_mutex){+.+.}-{3:3}, at: cgro= up_kn_lock_live+0x85/0x280 > [ 8625.481258] #3: ffffffff94788f10 (shrinker_rwsem){++++}-{3:3}, at: al= loc_shrinker_info+0x23/0x150 > [ 8625.483525] 1 lock held by khungtaskd/37: > [ 8625.484635] #0: ffffffff945890a0 (rcu_read_lock){....}-{1:2}, at: deb= ug_show_all_locks+0x28/0x20a > [ 8625.486948] 2 locks held by fsstress/234266: > [ 8625.488148] #0: ffff88810b329438 (sb_writers#13){.+.+}-{0:0}, at: __s= e_sys_copy_file_range+0x127/0x2f0 > [ 8625.490569] #1: ffff88800c8c5300 (&sb->s_type->i_mutex_key#16){++++}-= {3:3}, at: nfs_start_io_read+0x25/0x90 > [ 8625.493059] 2 locks held by fsstress/234268: > [ 8625.494229] #0: ffff88810b329438 (sb_writers#13){.+.+}-{0:0}, at: __s= e_sys_copy_file_range+0x127/0x2f0 > [ 8625.496557] #1: ffff888114ccdbb8 (&sb->s_type->i_mutex_key#16){++++}-= {3:3}, at: nfs_start_io_read+0x25/0x90 > [ 8625.499025] 2 locks held by fsstress/234271: > [ 8625.500191] #0: ffff88810b329438 (sb_writers#13){.+.+}-{0:0}, at: ope= n_last_lookups+0x670/0x690 > [ 8625.502667] #1: ffff88810ae6dbb8 (&type->i_mutex_dir_key#7){++++}-{3:= 3}, at: open_last_lookups+0x63b/0x690 > [ 8625.505150] 2 locks held by fsstress/234283: > [ 8625.506341] #0: ffff888111e53268 (&pipe->mutex/1){+.+.}-{3:3}, at: do= _splice+0x3a3/0x800 > [ 8625.508438] #1: ffff8881144eed28 (&sb->s_type->i_mutex_key#16){++++}-= {3:3}, at: nfs_start_io_read+0x25/0x90 > [ 8625.510917] 3 locks held by bash/234291: > [ 8625.512026] #0: ffff888102fe1438 (sb_writers#3){.+.+}-{0:0}, at: ksys= _write+0xc9/0x170 > [ 8625.514093] #1: ffffffff94788f10 (shrinker_rwsem){++++}-{3:3}, at: sh= rink_slab+0xa9/0x1d0 > [ 8625.516246] #2: ffff88810b3290e0 (&type->s_umount_key#51){++++}-{3:3}= , at: super_cache_scan+0x41/0x2c0 > [ 8625.518631] 2 locks held by bash/234303: > [ 8625.519758] #0: ffff888107df1438 (sb_writers#11){.+.+}-{0:0}, at: ksy= s_write+0xc9/0x170 > [ 8625.521829] #1: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.523922] 2 locks held by bash/234377: > [ 8625.525016] #0: ffff888107df1438 (sb_writers#11){.+.+}-{0:0}, at: ksy= s_write+0xc9/0x170 > [ 8625.527097] #1: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.529207] 2 locks held by bash/234550: > [ 8625.530310] #0: ffff888107df1438 (sb_writers#11){.+.+}-{0:0}, at: ksy= s_write+0xc9/0x170 > [ 8625.532393] #1: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_s= vc+0xc6/0x3c0 > [ 8625.534409] 1 lock held by cat/234560: > [ 8625.535482] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.537599] 1 lock held by cat/234574: > [ 8625.538663] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.540736] 1 lock held by cat/234575: > [ 8625.541785] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_p= ool_stats_open+0xea/0x2b0 > [ 8625.543998] 1 lock held by cat/234576: > [ 8625.545064] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_n= rthreads+0xbf/0x210 > [ 8625.547185] 3 locks held by bash/234577: > [ 8625.548285] #0: ffff888107df1438 (sb_writers#11){.+.+}-{0:0}, at: ksy= s_write+0xc9/0x170 > [ 8625.550368] #1: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_s= vc+0xc6/0x3c0 > [ 8625.552346] #2: ffffffff94788f10 (shrinker_rwsem){++++}-{3:3}, at: un= register_shrinker+0x47/0x120 > [ 8625.554653] 1 lock held by cat/234578: > [ 8625.555698] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_p= ool_stats_open+0xea/0x2b0 > [ 8625.557931] 1 lock held by cat/234579: > [ 8625.558999] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_p= ool_stats_open+0xea/0x2b0 > [ 8625.561223] 2 locks held by bash/234581: > [ 8625.562312] #0: ffff888107df1438 (sb_writers#11){.+.+}-{0:0}, at: ksy= s_write+0xc9/0x170 > [ 8625.564375] #1: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.566443] 1 lock held by cat/234582: > [ 8625.567499] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_p= ool_stats_open+0xea/0x2b0 > [ 8625.569738] 1 lock held by cat/234583: > [ 8625.570796] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.572877] 1 lock held by cat/234584: > [ 8625.573936] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_n= rthreads+0xbf/0x210 > [ 8625.576035] 1 lock held by cat/234588: > [ 8625.577100] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.579200] 1 lock held by cat/234590: > [ 8625.580268] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.582306] 1 lock held by cat/234596: > [ 8625.583342] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_p= ool_stats_open+0xea/0x2b0 > [ 8625.585518] 1 lock held by cat/234597: > [ 8625.586567] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.588611] 2 locks held by bash/234600: > [ 8625.589671] #0: ffff888107df1438 (sb_writers#11){.+.+}-{0:0}, at: ksy= s_write+0xc9/0x170 > [ 8625.591708] #1: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.593764] 1 lock held by cat/234602: > [ 8625.594839] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_n= rthreads+0xbf/0x210 > [ 8625.596969] 1 lock held by cat/234604: > [ 8625.598031] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: write_= versions+0x21/0x60 > [ 8625.600053] 1 lock held by cat/234605: > [ 8625.601150] #0: ffffffff94a4bbe8 (nfsd_mutex){+.+.}-{3:3}, at: nfsd_n= rthreads+0xbf/0x210 >=20 > [ 8625.603802] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D >=20 > [ 8625.605721] Kernel panic - not syncing: hung_task: blocked tasks > [ 8625.607247] CPU: 1 PID: 37 Comm: khungtaskd Not tainted 5.10.0-00574-g= c310db27923f-dirty #159 > [ 8625.609294] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIO= S rel-1.14.0-0-g155821a1990b-prebuilt.qe > mu.org 04/01/2014 > [ 8625.611997] Call Trace: > [ 8625.612744] dump_stack+0x9a/0xd0 > [ 8625.613696] panic+0x219/0x3e5 > [ 8625.614562] ? __warn_printk+0xf7/0xf7 > [ 8625.615601] ? debug_show_all_locks+0x1cb/0x20a > [ 8625.616822] check_hung_uninterruptible_tasks.cold+0x4d/0x75 > [ 8625.618267] ? check_hung_uninterruptible_tasks+0x330/0x330 > [ 8625.619673] watchdog+0xe3/0xf0 > [ 8625.620568] kthread+0x1c4/0x210 > [ 8625.621479] ? kthread_parkme+0x40/0x40 > [ 8625.622524] ret_from_fork+0x1f/0x30 > [ 8625.623556] Kernel Offset: 0x10200000 from 0xffffffff81000000 (relocat= ion range: 0xffffffff80000000-0xffffffff > bfffffff) > [ 8625.626030] ---[ end Kernel panic - not syncing: hung_task: blocked ta= sks ]--- >=20 > View: https://bugzilla.kernel.org/show_bug.cgi?id=3D219550#c0 > You can reply to this message to join the discussion. --=20 Jeff Layton