INFO: task kworker/u4:8:2426 blocked for more than 143 seconds.
Not tainted 6.8.0-rc7-syzkaller-00231-g09e5c48fea17 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:8 state:D stack:19832 pid:2426 tgid:2426 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:2)
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6874
rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1ae/0x200 kernel/locking/rwsem.c:1306
f2fs_down_write fs/f2fs/f2fs.h:2138 [inline]
f2fs_balance_fs+0x500/0x730 fs/f2fs/segment.c:437
f2fs_write_inode+0x3f0/0x470 fs/f2fs/inode.c:794
write_inode fs/fs-writeback.c:1473 [inline]
__writeback_single_inode+0x69f/0xfd0 fs/fs-writeback.c:1690
writeback_sb_inodes+0x8e3/0x1220 fs/fs-writeback.c:1916
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:1987
wb_writeback+0x461/0xc80 fs/fs-writeback.c:2094
wb_check_background_flush fs/fs-writeback.c:2164 [inline]
wb_do_writeback fs/fs-writeback.c:2252 [inline]
wb_workfn+0xc33/0xfb0 fs/fs-writeback.c:2279
process_one_work kernel/workqueue.c:2633 [inline]
process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
Showing all locks held in the system:
3 locks held by kworker/u4:0/11:
1 lock held by khungtaskd/29:
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
4 locks held by kworker/u4:8/2426:
#0: ffff888018acdd38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#0: ffff888018acdd38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#1: ffffc90009a17d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#1: ffffc90009a17d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#2: ffff88807c0660e0 (&type->s_umount_key#78){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:561
#3: ffff88802cdf92a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2138 [inline]
#3: ffff88802cdf92a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x500/0x730 fs/f2fs/segment.c:437
2 locks held by kworker/u4:9/2479:
#0: ffff8880b953c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
#1: ffff8880b9528988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988
2 locks held by getty/4813:
#0: ffff88801ddf00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.4/5088:
5 locks held by syz-executor.2/1892:
1 lock held by udevd/1912:
#0: ffff88801d09ce40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:859 [inline]
#0: ffff88801d09ce40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf1/0x7c0 mm/readahead.c:225
2 locks held by udevd/1921:
#0: ffff8880b953c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
#1: ffff8880b9528988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988
1 lock held by syz-executor.3/4512:
1 lock held by syz-executor.0/4518:
#0: ffffffff8e136578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#0: ffffffff8e136578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:995
5 locks held by syz-executor.4/4552:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc7-syzkaller-00231-g09e5c48fea17 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
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:222 [inline]
watchdog+0xfaf/0xff0 kernel/hung_task.c:379
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11 Comm: kworker/u4:0 Not tainted 6.8.0-rc7-syzkaller-00231-g09e5c48fea17 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__lock_acquire+0x6a2/0x1fd0 kernel/locking/lockdep.c:5087
Code: 00 00 00 00 00 fc ff df 90 0f 0b 90 90 90 31 db 48 81 c3 c5 00 00 00 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 6c 11 00 00 <4a> 8d 04 f6 48 89 44 24 48 40 84 ed 4c 8b 74 24 20 0f 84 3c 04 00
RSP: 0018:ffffc900001078d0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff9293fdad RCX: ffffffff817122c9
RDX: dffffc0000000000 RSI: ffff88801729c640 RDI: ffffffff92c58420
RBP: 0000000000000002 R08: ffffffff92c58427 R09: 1ffffffff258b084
R10: dffffc0000000000 R11: fffffbfff258b085 R12: 0000000000000000
R13: ffff88801729bb80 R14: 000000000000000a R15: ffff88801729c6b0
FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f64422d66e4 CR3: 0000000021aac000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
rcu_read_lock include/linux/rcupdate.h:750 [inline]
batadv_nc_process_nc_paths+0xd6/0x3a0 net/batman-adv/network-coding.c:687
batadv_nc_worker+0x52c/0x610 net/batman-adv/network-coding.c:735
process_one_work kernel/workqueue.c:2633 [inline]
process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243