INFO: task kworker/u8:7:2444 blocked for more than 143 seconds.
Not tainted 6.9.0-rc6-next-20240503-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:7 state:D stack:13560 pid:2444 tgid:2444 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-bcachefs-1)
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a50 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
__closure_sync+0x259/0x2f0 lib/closure.c:135
closure_sync include/linux/closure.h:194 [inline]
__bch2_write+0x5458/0x5bd0 fs/bcachefs/io_write.c:1497
bch2_write+0x947/0x1640 fs/bcachefs/io_write.c:1621
closure_queue include/linux/closure.h:257 [inline]
closure_call include/linux/closure.h:390 [inline]
bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:460 [inline]
__bch2_writepage+0x1416/0x2b50 fs/bcachefs/fs-io-buffered.c:607
write_cache_pages+0xd0/0x230 mm/page-writeback.c:2590
bch2_writepages+0x14f/0x380 fs/bcachefs/fs-io-buffered.c:650
do_writepages+0x359/0x870 mm/page-writeback.c:2633
__writeback_single_inode+0x165/0x10b0 fs/fs-writeback.c:1651
writeback_sb_inodes+0x99c/0x1380 fs/fs-writeback.c:1947
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2018
wb_writeback+0x495/0xd40 fs/fs-writeback.c:2129
wb_check_background_flush fs/fs-writeback.c:2199 [inline]
wb_do_writeback fs/fs-writeback.c:2287 [inline]
wb_workfn+0xc58/0x1090 fs/fs-writeback.c:2314
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e333de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:327 [inline]
#0: ffffffff8e333de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:839 [inline]
#0: ffffffff8e333de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u8:7/2444:
#0: ffff888018ef6148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff888018ef6148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc90009c8fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc90009c8fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffff888022c8a0e0 (&type->s_umount_key#43){.+.+}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562
2 locks held by getty/4848:
#0: ffff888015fc50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.9.0-rc6-next-20240503-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xfde/0x1020 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4524 Comm: syslogd Not tainted 6.9.0-rc6-next-20240503-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:223 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4774 [inline]
RIP: 0010:__lock_acquire+0x5ab/0x1fd0 kernel/locking/lockdep.c:5087
Code: 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 39 12 00 00 0f b6 2b 48 8b 44 24 20 0f b6 04 10 84 c0 0f 85 49 12 00 00 41 8b 1f <81> e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 80 a5 fa 92 be
RSP: 0018:ffffc900031e7190 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 00000000000c00ac RCX: ffffffff817273cb
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff92faa590
RBP: 0000000000000000 R08: ffffffff92faa597 R09: 1ffffffff25f54b2
R10: dffffc0000000000 R11: fffffbfff25f54b3 R12: 0000000000000001
R13: ffff888030b20000 R14: 0000000000000005 R15: ffff888030b20b28
FS: 00007f359ac60380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5dbbf9601d CR3: 000000002d6ea000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
do_write_seqcount_begin_nested include/linux/seqlock.h:469 [inline]
do_write_seqcount_begin include/linux/seqlock.h:495 [inline]
psi_account_irqtime+0x1b2/0x5d0 kernel/sched/psi.c:1016
update_rq_clock_task kernel/sched/core.c:726 [inline]
update_rq_clock+0x22b/0x8a0 kernel/sched/core.c:770
__schedule+0x432/0x4a50 kernel/sched/core.c:6658
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
schedule_timeout+0xb0/0x310 kernel/time/timer.c:2557
__skb_wait_for_more_packets+0x399/0x600 net/core/datagram.c:121
__unix_dgram_recvmsg+0x34a/0x12f0 net/unix/af_unix.c:2396
sock_recvmsg_nosec net/socket.c:1046 [inline]
sock_recvmsg+0x22f/0x280 net/socket.c:1068
sock_read_iter+0x2ca/0x3e0 net/socket.c:1138
new_sync_read fs/read_write.c:395 [inline]
vfs_read+0x9c4/0xbd0 fs/read_write.c:476
ksys_read+0x1a0/0x2c0 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f359adb4b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffdbf998368 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f359adb4b6a
RDX: 00000000000000ff RSI: 000055bb1a851950 RDI: 0000000000000000
RBP: 000055bb1a851910 R08: 0000000000000001 R09: 0000000000000000
R10: 00007f359af533a3 R11: 0000000000000246 R12: 000055bb1a8519ac
R13: 000055bb1a851950 R14: 0000000000000000 R15: 00007f359af97a80
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.783 msecs