INFO: task kworker/u4:5:960 blocked for more than 143 seconds.
Not tainted 6.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:5 state:D stack:20984 pid:960 tgid:960 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:1)
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/u4:2/37:
4 locks held by kworker/u4:5/960:
#0: ffff888018ad1d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#0: ffff888018ad1d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#1: ffffc90003d4fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#1: ffffc90003d4fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#2: ffff888037a500e0 (&type->s_umount_key#88){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:561
#3: ffff88803a7752a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2138 [inline]
#3: ffff88803a7752a8 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x500/0x730 fs/f2fs/segment.c:437
2 locks held by getty/4809:
#0: ffff88802a76b0a0 (&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.3/5094:
6 locks held by syz-executor.1/6341:
4 locks held by syz-executor.1/6642:
1 lock held by syz-executor.2/9103:
#0: ffff8880b943c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
1 lock held by syz-executor.0/9118:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6341 Comm: syz-executor.1 Not tainted 6.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:lock_acquire+0x25a/0x530 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 c4 24 81 00 f6 44 24 61 02 0f 85 8e 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90015706720 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92002ae0cf0 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8baac7c0 RDI: ffffffff8bfd9960
RBP: ffffc90015706868 R08: ffffffff92c5853f R09: 1ffffffff258b0a7
R10: dffffc0000000000 R11: fffffbfff258b0a8 R12: 1ffff92002ae0cec
R13: dffffc0000000000 R14: ffffc90015706780 R15: 0000000000000246
FS: 00007f685f1de6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f190868c000 CR3: 000000007efaa000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
down_read+0xb1/0xa40 kernel/locking/rwsem.c:1526
check_valid_map fs/f2fs/gc.c:985 [inline]
gc_data_segment fs/f2fs/gc.c:1534 [inline]
do_garbage_collect+0x21e7/0x80a0 fs/f2fs/gc.c:1763
f2fs_gc+0xeda/0x3140 fs/f2fs/gc.c:1866
f2fs_balance_fs+0x549/0x730 fs/f2fs/segment.c:439
f2fs_map_blocks+0x3ad8/0x43c0 fs/f2fs/data.c:1826
f2fs_expand_inode_data+0x5d0/0xb70 fs/f2fs/file.c:1739
f2fs_fallocate+0x407/0x6b0 fs/f2fs/file.c:1834
vfs_fallocate+0x564/0x6c0 fs/open.c:328
do_vfs_ioctl+0x22f4/0x2b60 fs/ioctl.c:850
__do_sys_ioctl fs/ioctl.c:869 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:857
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f685e47dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f685f1de0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f685e5abf80 RCX: 00007f685e47dda9
RDX: 0000000020000100 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 00007f685e4ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f685e5abf80 R15: 00007ffd997c17e8