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Message-Id: <201603111945.FHI64215.JVOFLHQFOMOSFt@I-love.SAKURA.ne.jp>
Date: Fri, 11 Mar 2016 19:45:29 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: mhocko@...nel.org, akpm@...ux-foundation.org
Cc: torvalds@...ux-foundation.org, hannes@...xchg.org, mgorman@...e.de,
rientjes@...gle.com, hillf.zj@...baba-inc.com,
kamezawa.hiroyu@...fujitsu.com, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] OOM detection rework v4
(Posting as a reply to this thread.)
I was trying to test side effect of "oom, oom_reaper: disable oom_reaper for
oom_kill_allocating_task" compared to "oom: clear TIF_MEMDIE after oom_reaper
managed to unmap the address space" using a reproducer shown below.
---------- Reproducer start ----------
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sched.h>
#include <sys/prctl.h>
#include <signal.h>
static char buffer[4096] = { };
static int file_io(void *unused)
{
const int fd = open(buffer, O_WRONLY | O_CREAT | O_APPEND, 0600);
sleep(2);
while (write(fd, buffer, sizeof(buffer)) > 0);
close(fd);
return 0;
}
int main(int argc, char *argv[])
{
int i;
if (chdir("/tmp"))
return 1;
for (i = 0; i < 64; i++)
if (fork() == 0) {
static cpu_set_t set = { { 1 } };
const int fd = open("/proc/self/oom_score_adj", O_WRONLY);
write(fd, "1000", 4);
close(fd);
sched_setaffinity(0, sizeof(set), &set);
snprintf(buffer, sizeof(buffer), "file_io.%02u", i);
prctl(PR_SET_NAME, (unsigned long) buffer, 0, 0, 0);
for (i = 0; i < 16; i++)
clone(file_io, malloc(1024) + 1024, CLONE_VM, NULL);
while (1)
pause();
}
{ /* A dummy process for invoking the OOM killer. */
char *buf = NULL;
unsigned long i;
unsigned long size = 0;
prctl(PR_SET_NAME, (unsigned long) "memeater", 0, 0, 0);
for (size = 1048576; size < 512UL * (1 << 30); size <<= 1) {
char *cp = realloc(buf, size);
if (!cp) {
size >>= 1;
break;
}
buf = cp;
}
sleep(4);
for (i = 0; i < size; i += 4096)
buf[i] = '\0'; /* Will cause OOM due to overcommit */
}
kill(-1, SIGKILL);
return * (char *) NULL; /* Not reached. */
}
---------- Reproducer end ----------
The characteristic of this reproducer is that the OOM killer chooses the same mm
for multiple times due to clone(!CLONE_SIGHAND && CLONE_VM) and the OOM reaper
happily skips reaping that mm due to marking that mm_struct as MMF_OOM_KILLED or
marking only first victim's signal_struct as OOM_SCORE_ADJ_MIN, which means that
nobody can unlock TIF_MEMDIE when non-first victim cannot terminate.
But the problem I can hit trivially is that kswapd got stuck at unkillable lock
when all allocating tasks are waiting at congestion_wait(). This situation resembles
http://lkml.kernel.org/r/201602092349.ACG81273.OSVtMJQHLOFOFF@I-love.SAKURA.ne.jp
but not looping at too_many_isolated() in shrink_inactive_list().
I don't know what is happening.
Complete log is at http://I-love.SAKURA.ne.jp/tmp/serial-20160311.txt.xz .
---------- console log start ----------
[ 81.282661] memeater invoked oom-killer: gfp_mask=0x24280ca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), order=0, oom_score_adj=0
[ 81.297589] memeater cpuset=/ mems_allowed=0
[ 81.303615] CPU: 2 PID: 1239 Comm: memeater Tainted: G W 4.5.0-rc7-next-20160310 #103
(...snipped...)
[ 81.456295] Out of memory: Kill process 1240 (file_io.00) score 999 or sacrifice child
[ 81.459768] Killed process 1240 (file_io.00) total-vm:4308kB, anon-rss:84kB, file-rss:0kB, shmem-rss:0kB
[ 81.682547] ksmtuned invoked oom-killer: gfp_mask=0x24084c0(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO), order=0, oom_score_adj=0
[ 81.703992] ksmtuned cpuset=/ mems_allowed=0
[ 81.709402] CPU: 1 PID: 2330 Comm: ksmtuned Tainted: G W 4.5.0-rc7-next-20160310 #103
(...snipped...)
[ 81.928733] Out of memory: Kill process 1248 (file_io.00) score 1000 or sacrifice child
[ 81.932194] Killed process 1248 (file_io.00) total-vm:4308kB, anon-rss:104kB, file-rss:1044kB, shmem-rss:0kB
(...snipped...)
[ 136.837273] Node 0 DMA free:3864kB min:60kB low:72kB high:84kB active_anon:9504kB inactive_anon:84kB active_file:140kB inactive_file:448kB unevictable:0kB isolated(anon):0kB isolated(file):0kB
present:15988kB managed:15904kB mlocked:0kB dirty:448kB writeback:0kB mapped:172kB shmem:84kB slab_reclaimable:164kB slab_unreclaimable:692kB kernel_stack:448kB pagetables:156kB unstable:0kB
bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:4244 all_unreclaimable? yes
[ 136.858075] lowmem_reserve[]: 0 953 953 953
[ 136.860609] Node 0 DMA32 free:3648kB min:3780kB low:4752kB high:5724kB active_anon:783216kB inactive_anon:6376kB active_file:33388kB inactive_file:40292kB unevictable:0kB isolated(anon):0kB
isolated(file):128kB present:1032064kB managed:980816kB mlocked:0kB dirty:40232kB writeback:120kB mapped:34720kB shmem:6628kB slab_reclaimable:10528kB slab_unreclaimable:39068kB kernel_stack:20512kB
pagetables:8000kB unstable:0kB bounce:0kB free_pcp:1648kB local_pcp:116kB free_cma:0kB writeback_tmp:0kB pages_scanned:964952 all_unreclaimable? yes
[ 136.880330] lowmem_reserve[]: 0 0 0 0
[ 136.883137] Node 0 DMA: 28*4kB (UE) 15*8kB (UE) 9*16kB (UME) 1*32kB (M) 2*64kB (UE) 2*128kB (UE) 0*256kB 2*512kB (UE) 2*1024kB (UE) 0*2048kB 0*4096kB = 3864kB
[ 136.890862] Node 0 DMA32: 860*4kB (UME) 16*8kB (UME) 1*16kB (M) 0*32kB 1*64kB (M) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 3648kB
(...snipped...)
[ 143.721805] kswapd0 D ffff880039ffb760 0 52 2 0x00000000
[ 143.724711] ffff880039ffb760 ffff88003bb5e140 ffff880039ff4000 ffff880039ffc000
[ 143.727782] ffff88003a2c3850 ffff88003a2c3868 ffff880039ffb958 0000000000000001
[ 143.730815] ffff880039ffb778 ffffffff81666600 ffff880039ff4000 ffff880039ffb7d8
[ 143.733839] Call Trace:
[ 143.735190] [<ffffffff81666600>] schedule+0x30/0x80
[ 143.737387] [<ffffffff8166a066>] rwsem_down_read_failed+0xd6/0x140
[ 143.739964] [<ffffffff81323708>] call_rwsem_down_read_failed+0x18/0x30
[ 143.742944] [<ffffffff810b888b>] down_read_nested+0x3b/0x50
[ 143.745315] [<ffffffffa0242c5b>] ? xfs_ilock+0x4b/0xe0 [xfs]
[ 143.747737] [<ffffffffa0242c5b>] xfs_ilock+0x4b/0xe0 [xfs]
[ 143.750071] [<ffffffffa022d2d0>] xfs_map_blocks+0x80/0x150 [xfs]
[ 143.752534] [<ffffffffa022e27b>] xfs_do_writepage+0x15b/0x500 [xfs]
[ 143.755230] [<ffffffffa022e656>] xfs_vm_writepage+0x36/0x70 [xfs]
[ 143.757959] [<ffffffff8115356f>] pageout.isra.43+0x18f/0x240
[ 143.760382] [<ffffffff81154ed3>] shrink_page_list+0x803/0xae0
[ 143.762785] [<ffffffff8115590b>] shrink_inactive_list+0x1fb/0x460
[ 143.765347] [<ffffffff81156516>] shrink_zone_memcg+0x5b6/0x780
[ 143.767801] [<ffffffff811567b4>] shrink_zone+0xd4/0x2f0
[ 143.770084] [<ffffffff81157661>] kswapd+0x441/0x830
[ 143.772193] [<ffffffff81157220>] ? mem_cgroup_shrink_node_zone+0xb0/0xb0
[ 143.774941] [<ffffffff8109181e>] kthread+0xee/0x110
[ 143.777025] [<ffffffff8166b6f2>] ret_from_fork+0x22/0x50
[ 143.779276] [<ffffffff81091730>] ? kthread_create_on_node+0x230/0x230
(...snipped...)
[ 144.479298] file_io.00 D ffff88003ac97cb8 0 1248 1 0x00100084
[ 144.482410] ffff88003ac97cb8 ffff88003b8760c0 ffff88003658c040 ffff88003ac98000
[ 144.485513] ffff88003a280ac8 0000000000000246 ffff88003658c040 00000000ffffffff
[ 144.488618] ffff88003ac97cd0 ffffffff81666600 ffff88003a280ac0 ffff88003ac97ce0
[ 144.491661] Call Trace:
[ 144.492921] [<ffffffff81666600>] schedule+0x30/0x80
[ 144.495066] [<ffffffff81666909>] schedule_preempt_disabled+0x9/0x10
[ 144.497582] [<ffffffff816684bf>] mutex_lock_nested+0x14f/0x3a0
[ 144.500060] [<ffffffffa0237eef>] ? xfs_file_buffered_aio_write+0x5f/0x1f0 [xfs]
[ 144.503077] [<ffffffff810bd130>] ? __lock_acquire+0x8c0/0x1f50
[ 144.505494] [<ffffffffa0237eef>] xfs_file_buffered_aio_write+0x5f/0x1f0 [xfs]
[ 144.508375] [<ffffffff8111dfca>] ? __audit_syscall_entry+0xaa/0xf0
[ 144.510996] [<ffffffffa023810a>] xfs_file_write_iter+0x8a/0x150 [xfs]
[ 144.514521] [<ffffffff811bf327>] __vfs_write+0xc7/0x100
[ 144.517230] [<ffffffff811bfedd>] vfs_write+0x9d/0x190
[ 144.519407] [<ffffffff811df5da>] ? __fget_light+0x6a/0x90
[ 144.521772] [<ffffffff811c0713>] SyS_write+0x53/0xd0
[ 144.523909] [<ffffffff8100364d>] do_syscall_64+0x5d/0x180
[ 144.526145] [<ffffffff8166b57f>] entry_SYSCALL64_slow_path+0x25/0x25
(...snipped...)
[ 145.684411] kworker/3:3 D ffff88000e987878 0 2329 2 0x00000080
[ 145.684415] Workqueue: events_freezable_power_ disk_events_workfn
[ 145.684416] ffff88000e987878 ffff880037d76140 ffff88000e980100 ffff88000e988000
[ 145.684417] ffff88000e9878b0 ffff88003d6d02c0 00000000fffd9bc4 ffff88003ffdf100
[ 145.684417] ffff88000e987890 ffffffff81666600 ffff88003d6d02c0 ffff88000e987938
[ 145.684418] Call Trace:
[ 145.684419] [<ffffffff81666600>] schedule+0x30/0x80
[ 145.684419] [<ffffffff8166a687>] schedule_timeout+0x117/0x1c0
[ 145.684420] [<ffffffff810bc306>] ? mark_held_locks+0x66/0x90
[ 145.684421] [<ffffffff810def90>] ? init_timer_key+0x40/0x40
[ 145.684422] [<ffffffff810e5e17>] ? ktime_get+0xa7/0x130
[ 145.684423] [<ffffffff81665b41>] io_schedule_timeout+0xa1/0x110
[ 145.684424] [<ffffffff81160ccd>] congestion_wait+0x7d/0xd0
[ 145.684425] [<ffffffff810b63a0>] ? wait_woken+0x80/0x80
[ 145.684426] [<ffffffff8114a602>] __alloc_pages_nodemask+0xb42/0xd50
[ 145.684427] [<ffffffff810bc300>] ? mark_held_locks+0x60/0x90
[ 145.684428] [<ffffffff81193a26>] alloc_pages_current+0x96/0x1b0
[ 145.684430] [<ffffffff812e1b3d>] ? bio_alloc_bioset+0x20d/0x2d0
[ 145.684431] [<ffffffff812e2e74>] bio_copy_kern+0xc4/0x180
[ 145.684433] [<ffffffff812edb20>] blk_rq_map_kern+0x70/0x130
[ 145.684435] [<ffffffff8145255d>] scsi_execute+0x12d/0x160
[ 145.684436] [<ffffffff81452684>] scsi_execute_req_flags+0x84/0xf0
[ 145.684438] [<ffffffffa01ed762>] sr_check_events+0xb2/0x2a0 [sr_mod]
[ 145.684440] [<ffffffffa01e1163>] cdrom_check_events+0x13/0x30 [cdrom]
[ 145.684441] [<ffffffffa01edba5>] sr_block_check_events+0x25/0x30 [sr_mod]
[ 145.684442] [<ffffffff812f928b>] disk_check_events+0x5b/0x150
[ 145.684443] [<ffffffff812f9397>] disk_events_workfn+0x17/0x20
[ 145.684445] [<ffffffff8108b4c5>] process_one_work+0x1a5/0x400
[ 145.684446] [<ffffffff8108b461>] ? process_one_work+0x141/0x400
[ 145.684448] [<ffffffff8108b846>] worker_thread+0x126/0x490
[ 145.684449] [<ffffffff81665ec1>] ? __schedule+0x311/0xa20
[ 145.684450] [<ffffffff8108b720>] ? process_one_work+0x400/0x400
[ 145.684451] [<ffffffff8109181e>] kthread+0xee/0x110
[ 145.684452] [<ffffffff8166b6f2>] ret_from_fork+0x22/0x50
[ 145.684453] [<ffffffff81091730>] ? kthread_create_on_node+0x230/0x230
(...snipped...)
[ 208.035194] Node 0 DMA free:3864kB min:60kB low:72kB high:84kB active_anon:9504kB inactive_anon:84kB active_file:140kB inactive_file:448kB unevictable:0kB isolated(anon):0kB isolated(file):0kB
present:15988kB managed:15904kB mlocked:0kB dirty:448kB writeback:0kB mapped:172kB shmem:84kB slab_reclaimable:164kB slab_unreclaimable:692kB kernel_stack:448kB pagetables:156kB unstable:0kB
bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:4244 all_unreclaimable? yes
[ 208.051970] lowmem_reserve[]: 0 953 953 953
[ 208.054174] Node 0 DMA32 free:3648kB min:3780kB low:4752kB high:5724kB active_anon:783216kB inactive_anon:6376kB active_file:33388kB inactive_file:40292kB unevictable:0kB isolated(anon):0kB
isolated(file):128kB present:1032064kB managed:980816kB mlocked:0kB dirty:40232kB writeback:120kB mapped:34724kB shmem:6628kB slab_reclaimable:10528kB slab_unreclaimable:39064kB kernel_stack:20512kB
pagetables:8000kB unstable:0kB bounce:0kB free_pcp:1644kB local_pcp:108kB free_cma:0kB writeback_tmp:0kB pages_scanned:1882904 all_unreclaimable? yes
[ 208.072237] lowmem_reserve[]: 0 0 0 0
[ 208.074340] Node 0 DMA: 28*4kB (UE) 15*8kB (UE) 9*16kB (UME) 1*32kB (M) 2*64kB (UE) 2*128kB (UE) 0*256kB 2*512kB (UE) 2*1024kB (UE) 0*2048kB 0*4096kB = 3864kB
[ 208.080915] Node 0 DMA32: 860*4kB (UME) 16*8kB (UME) 1*16kB (M) 0*32kB 1*64kB (M) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 3648kB
(...snipped...)
[ 290.388544] INFO: task kswapd0:52 blocked for more than 120 seconds.
[ 290.391197] Tainted: G W 4.5.0-rc7-next-20160310 #103
[ 290.393979] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 290.397150] kswapd0 D ffff880039ffb760 0 52 2 0x00000000
[ 290.400194] ffff880039ffb760 ffff88003bb5e140 ffff880039ff4000 ffff880039ffc000
[ 290.403394] ffff88003a2c3850 ffff88003a2c3868 ffff880039ffb958 0000000000000001
[ 290.406715] ffff880039ffb778 ffffffff81666600 ffff880039ff4000 ffff880039ffb7d8
[ 290.409874] Call Trace:
[ 290.411242] [<ffffffff81666600>] schedule+0x30/0x80
[ 290.413423] [<ffffffff8166a066>] rwsem_down_read_failed+0xd6/0x140
[ 290.416100] [<ffffffff81323708>] call_rwsem_down_read_failed+0x18/0x30
[ 290.418835] [<ffffffff810b888b>] down_read_nested+0x3b/0x50
[ 290.421278] [<ffffffffa0242c5b>] ? xfs_ilock+0x4b/0xe0 [xfs]
[ 290.423672] [<ffffffffa0242c5b>] xfs_ilock+0x4b/0xe0 [xfs]
[ 290.426042] [<ffffffffa022d2d0>] xfs_map_blocks+0x80/0x150 [xfs]
[ 290.428569] [<ffffffffa022e27b>] xfs_do_writepage+0x15b/0x500 [xfs]
[ 290.431173] [<ffffffffa022e656>] xfs_vm_writepage+0x36/0x70 [xfs]
[ 290.433753] [<ffffffff8115356f>] pageout.isra.43+0x18f/0x240
[ 290.436135] [<ffffffff81154ed3>] shrink_page_list+0x803/0xae0
[ 290.438583] [<ffffffff8115590b>] shrink_inactive_list+0x1fb/0x460
[ 290.441090] [<ffffffff81156516>] shrink_zone_memcg+0x5b6/0x780
[ 290.443500] [<ffffffff811567b4>] shrink_zone+0xd4/0x2f0
[ 290.445703] [<ffffffff81157661>] kswapd+0x441/0x830
[ 290.447973] [<ffffffff81157220>] ? mem_cgroup_shrink_node_zone+0xb0/0xb0
[ 290.450676] [<ffffffff8109181e>] kthread+0xee/0x110
[ 290.452780] [<ffffffff8166b6f2>] ret_from_fork+0x22/0x50
[ 290.455018] [<ffffffff81091730>] ? kthread_create_on_node+0x230/0x230
[ 290.457910] 1 lock held by kswapd0/52:
[ 290.459813] #0: (&xfs_nondir_ilock_class){++++--}, at: [<ffffffffa0242c5b>] xfs_ilock+0x4b/0xe0 [xfs]
(...snipped...)
[ 336.562747] Node 0 DMA free:3864kB min:60kB low:72kB high:84kB active_anon:9504kB inactive_anon:84kB active_file:140kB inactive_file:448kB unevictable:0kB isolated(anon):0kB isolated(file):0kB
present:15988kB managed:15904kB mlocked:0kB dirty:448kB writeback:0kB mapped:172kB shmem:84kB slab_reclaimable:164kB slab_unreclaimable:692kB kernel_stack:448kB pagetables:156kB unstable:0kB
bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:4244 all_unreclaimable? yes
[ 336.589823] lowmem_reserve[]: 0 953 953 953
[ 336.593296] Node 0 DMA32 free:3776kB min:3780kB low:4752kB high:5724kB active_anon:783216kB inactive_anon:6376kB active_file:33388kB inactive_file:40292kB unevictable:0kB isolated(anon):0kB
isolated(file):128kB present:1032064kB managed:980816kB mlocked:0kB dirty:40232kB writeback:120kB mapped:34724kB shmem:6628kB slab_reclaimable:10528kB slab_unreclaimable:39192kB kernel_stack:20416kB
pagetables:8000kB unstable:0kB bounce:0kB free_pcp:1520kB local_pcp:100kB free_cma:0kB writeback_tmp:0kB pages_scanned:1001584 all_unreclaimable? yes
[ 336.618011] lowmem_reserve[]: 0 0 0 0
[ 336.620073] Node 0 DMA: 28*4kB (UE) 15*8kB (UE) 9*16kB (UME) 1*32kB (M) 2*64kB (UE) 2*128kB (UE) 0*256kB 2*512kB (UE) 2*1024kB (UE) 0*2048kB 0*4096kB = 3864kB
[ 336.626844] Node 0 DMA32: 860*4kB (UME) 18*8kB (UME) 8*16kB (UM) 0*32kB 1*64kB (M) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 3776kB
(...snipped...)
[ 393.774051] kswapd0 D ffff880039ffb760 0 52 2 0x00000000
[ 393.777018] ffff880039ffb760 ffff88003bb5e140 ffff880039ff4000 ffff880039ffc000
[ 393.779986] ffff88003a2c3850 ffff88003a2c3868 ffff880039ffb958 0000000000000001
[ 393.783000] ffff880039ffb778 ffffffff81666600 ffff880039ff4000 ffff880039ffb7d8
[ 393.785958] Call Trace:
[ 393.787191] [<ffffffff81666600>] schedule+0x30/0x80
[ 393.789198] [<ffffffff8166a066>] rwsem_down_read_failed+0xd6/0x140
[ 393.791707] [<ffffffff81323708>] call_rwsem_down_read_failed+0x18/0x30
[ 393.794364] [<ffffffff810b888b>] down_read_nested+0x3b/0x50
[ 393.796634] [<ffffffffa0242c5b>] ? xfs_ilock+0x4b/0xe0 [xfs]
[ 393.798952] [<ffffffffa0242c5b>] xfs_ilock+0x4b/0xe0 [xfs]
[ 393.801274] [<ffffffffa022d2d0>] xfs_map_blocks+0x80/0x150 [xfs]
[ 393.803709] [<ffffffffa022e27b>] xfs_do_writepage+0x15b/0x500 [xfs]
[ 393.806254] [<ffffffffa022e656>] xfs_vm_writepage+0x36/0x70 [xfs]
[ 393.808718] [<ffffffff8115356f>] pageout.isra.43+0x18f/0x240
[ 393.811002] [<ffffffff81154ed3>] shrink_page_list+0x803/0xae0
[ 393.813415] [<ffffffff8115590b>] shrink_inactive_list+0x1fb/0x460
[ 393.815834] [<ffffffff81156516>] shrink_zone_memcg+0x5b6/0x780
[ 393.818316] [<ffffffff811567b4>] shrink_zone+0xd4/0x2f0
[ 393.820472] [<ffffffff81157661>] kswapd+0x441/0x830
[ 393.822658] [<ffffffff81157220>] ? mem_cgroup_shrink_node_zone+0xb0/0xb0
[ 393.825463] [<ffffffff8109181e>] kthread+0xee/0x110
[ 393.827626] [<ffffffff8166b6f2>] ret_from_fork+0x22/0x50
[ 393.829824] [<ffffffff81091730>] ? kthread_create_on_node+0x230/0x230
(...snipped...)
[ 395.000240] file_io.00 D ffff88003ac97cb8 0 1248 1 0x00100084
[ 395.003355] ffff88003ac97cb8 ffff88003b8760c0 ffff88003658c040 ffff88003ac98000
[ 395.006582] ffff88003a280ac8 0000000000000246 ffff88003658c040 00000000ffffffff
[ 395.010026] ffff88003ac97cd0 ffffffff81666600 ffff88003a280ac0 ffff88003ac97ce0
[ 395.013010] Call Trace:
[ 395.014201] [<ffffffff81666600>] schedule+0x30/0x80
[ 395.016248] [<ffffffff81666909>] schedule_preempt_disabled+0x9/0x10
[ 395.018824] [<ffffffff816684bf>] mutex_lock_nested+0x14f/0x3a0
[ 395.021194] [<ffffffffa0237eef>] ? xfs_file_buffered_aio_write+0x5f/0x1f0 [xfs]
[ 395.024197] [<ffffffff810bd130>] ? __lock_acquire+0x8c0/0x1f50
[ 395.026672] [<ffffffffa0237eef>] xfs_file_buffered_aio_write+0x5f/0x1f0 [xfs]
[ 395.029525] [<ffffffff8111dfca>] ? __audit_syscall_entry+0xaa/0xf0
[ 395.032029] [<ffffffffa023810a>] xfs_file_write_iter+0x8a/0x150 [xfs]
[ 395.034589] [<ffffffff811bf327>] __vfs_write+0xc7/0x100
[ 395.036723] [<ffffffff811bfedd>] vfs_write+0x9d/0x190
[ 395.038841] [<ffffffff811df5da>] ? __fget_light+0x6a/0x90
[ 395.041069] [<ffffffff811c0713>] SyS_write+0x53/0xd0
[ 395.043258] [<ffffffff8100364d>] do_syscall_64+0x5d/0x180
[ 395.045511] [<ffffffff8166b57f>] entry_SYSCALL64_slow_path+0x25/0x25
(...snipped...)
[ 446.012823] kworker/3:3 D ffff88000e987878 0 2329 2 0x00000080
[ 446.015632] Workqueue: events_freezable_power_ disk_events_workfn
[ 446.018103] ffff88000e987878 ffff88003cc0c040 ffff88000e980100 ffff88000e988000
[ 446.021099] ffff88000e9878b0 ffff88003d6d02c0 0000000100016c95 ffff88003ffdf100
[ 446.024247] ffff88000e987890 ffffffff81666600 ffff88003d6d02c0 ffff88000e987938
[ 446.027332] Call Trace:
[ 446.028568] [<ffffffff81666600>] schedule+0x30/0x80
[ 446.030748] [<ffffffff8166a687>] schedule_timeout+0x117/0x1c0
[ 446.033122] [<ffffffff810bc306>] ? mark_held_locks+0x66/0x90
[ 446.035466] [<ffffffff810def90>] ? init_timer_key+0x40/0x40
[ 446.037756] [<ffffffff810e5e17>] ? ktime_get+0xa7/0x130
[ 446.039960] [<ffffffff81665b41>] io_schedule_timeout+0xa1/0x110
[ 446.042385] [<ffffffff81160ccd>] congestion_wait+0x7d/0xd0
[ 446.044651] [<ffffffff810b63a0>] ? wait_woken+0x80/0x80
[ 446.046817] [<ffffffff8114a602>] __alloc_pages_nodemask+0xb42/0xd50
[ 446.049395] [<ffffffff810bc300>] ? mark_held_locks+0x60/0x90
[ 446.051700] [<ffffffff81193a26>] alloc_pages_current+0x96/0x1b0
[ 446.054089] [<ffffffff812e1b3d>] ? bio_alloc_bioset+0x20d/0x2d0
[ 446.056515] [<ffffffff812e2e74>] bio_copy_kern+0xc4/0x180
[ 446.058737] [<ffffffff812edb20>] blk_rq_map_kern+0x70/0x130
[ 446.061105] [<ffffffff8145255d>] scsi_execute+0x12d/0x160
[ 446.063334] [<ffffffff81452684>] scsi_execute_req_flags+0x84/0xf0
[ 446.065810] [<ffffffffa01ed762>] sr_check_events+0xb2/0x2a0 [sr_mod]
[ 446.068343] [<ffffffffa01e1163>] cdrom_check_events+0x13/0x30 [cdrom]
[ 446.070897] [<ffffffffa01edba5>] sr_block_check_events+0x25/0x30 [sr_mod]
[ 446.073569] [<ffffffff812f928b>] disk_check_events+0x5b/0x150
[ 446.075895] [<ffffffff812f9397>] disk_events_workfn+0x17/0x20
[ 446.078340] [<ffffffff8108b4c5>] process_one_work+0x1a5/0x400
[ 446.080696] [<ffffffff8108b461>] ? process_one_work+0x141/0x400
[ 446.083069] [<ffffffff8108b846>] worker_thread+0x126/0x490
[ 446.085395] [<ffffffff81665ec1>] ? __schedule+0x311/0xa20
[ 446.087587] [<ffffffff8108b720>] ? process_one_work+0x400/0x400
[ 446.089996] [<ffffffff8109181e>] kthread+0xee/0x110
[ 446.092242] [<ffffffff8166b6f2>] ret_from_fork+0x22/0x50
[ 446.094527] [<ffffffff81091730>] ? kthread_create_on_node+0x230/0x230
---------- console log end ----------
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