INFO: task bch-copygc/loop:5257 blocked for more than 143 seconds.
      Not tainted 6.11.0-syzkaller-05591-g2a17bb8c204f #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:bch-copygc/loop state:D stack:18928 pid:5257  tgid:5257  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 __closure_sync+0x259/0x2f0 lib/closure.c:146
 bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:238 [inline]
 __bch2_write+0x55a7/0x5d20 fs/bcachefs/io_write.c:1506
 bch2_write+0x947/0x1670 fs/bcachefs/io_write.c:1633
 closure_queue include/linux/closure.h:270 [inline]
 closure_call include/linux/closure.h:432 [inline]
 bch2_data_update_read_done+0x22e/0x330 fs/bcachefs/data_update.c:423
 move_write fs/bcachefs/move.c:133 [inline]
 bch2_moving_ctxt_do_pending_writes+0x44c/0x8d0 fs/bcachefs/move.c:164
 bkey_nocow_lock fs/bcachefs/data_update.c:71 [inline]
 bch2_data_update_init+0x15e5/0x67b0 fs/bcachefs/data_update.c:628
 bch2_move_extent+0xfea/0x2b40 fs/bcachefs/move.c:313
 bch2_evacuate_bucket+0x2336/0x34d0 fs/bcachefs/move.c:753
 bch2_copygc+0x3a03/0x4650 fs/bcachefs/movinggc.c:234
 bch2_copygc_thread+0x737/0xc20 fs/bcachefs/movinggc.c:375
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e938b60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e938b60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e938b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701
2 locks held by getty/4983:
 #0: ffff88814bf6c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz-executor402/6083:

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-05591-g2a17bb8c204f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 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:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6084 Comm: syz-executor402 Not tainted 6.11.0-syzkaller-05591-g2a17bb8c204f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0033:0x7f18c6107cfb
Code: cd 48 01 c1 49 39 4f 08 72 4c 8d 4d ff 85 ed 74 33 66 0f 1f 44 00 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 47 0f b6 0c 08 <45> 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01 49 89 47 10 83
RSP: 002b:00007ffcde7b8170 EFLAGS: 00000202
RAX: 00000000001898e6 RBX: 00007ffcde7b8210 RCX: 0000000000000053
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007ffcde7b82b0
RBP: 0000000000000102 R08: 00007f18bdc00000 R09: 0000000000000000
R10: 0000000000000000 R11: 00007ffcde7b8220 R12: 0000000000000001
R13: 00007f18c618b020 R14: 0000000000000000 R15: 00007ffcde7b82b0
FS:  000055556596b380 GS:  0000000000000000