INFO: task bch-copygc/loop:5855 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc5-syzkaller-00006-g56e6a3499e14 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:bch-copygc/loop state:D stack:17040 pid:5855  tgid:5855  ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 __closure_sync+0x259/0x2f0 lib/closure.c:146
 bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:239 [inline]
 __bch2_write+0x562a/0x5dd0 fs/bcachefs/io_write.c:1501
 bch2_write+0x9b5/0x1760 fs/bcachefs/io_write.c:1631
 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:426
 move_write fs/bcachefs/move.c:133 [inline]
 bch2_moving_ctxt_do_pending_writes+0x44c/0x8d0 fs/bcachefs/move.c:164
 bch2_move_ratelimit+0x76c/0xeb0 fs/bcachefs/move.c:492
 bch2_evacuate_bucket+0x26b3/0x3610 fs/bcachefs/move.c:702
 bch2_copygc+0x42c1/0x4c90 fs/bcachefs/movinggc.c:240
 bch2_copygc_thread+0x736/0xc10 fs/bcachefs/movinggc.c:381
 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: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
7 locks held by kworker/u8:7/5014:
2 locks held by getty/5585:
 #0: ffff8880307270a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002fd62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc5-syzkaller-00006-g56e6a3499e14 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 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:234 [inline]
 watchdog+0xff6/0x1040 kernel/hung_task.c:397
 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: 6428 Comm: syz-executor419 Not tainted 6.13.0-rc5-syzkaller-00006-g56e6a3499e14 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:mark_usage kernel/locking/lockdep.c:4670 [inline]
RIP: 0010:__lock_acquire+0xc41/0x2100 kernel/locking/lockdep.c:5180
Code: 13 84 c0 0f 85 50 0d 00 00 41 8b 07 a9 00 00 18 00 0f 84 e1 04 00 00 4c 89 ef 48 89 ee ba 08 00 00 00 e8 92 65 00 00 45 31 f6 <85> c0 0f 84 da 07 00 00 48 c7 c0 c0 b9 3a 9a 48 c1 e8 03 48 bf 00
RSP: 0000:ffffc90004fd7c70 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffffffff93c60aa6 RCX: ffffffff817b274a
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff942a4880
RBP: ffff88807e8e4708 R08: ffffffff942a4887 R09: 1ffffffff2854910
R10: dffffc0000000000 R11: fffffbfff2854911 R12: ffff88807e8e46c4
R13: ffff88807e8e3c00 R14: 0000000000000000 R15: ffff88807e8e4728
FS:  000055556f410380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c022e2000 CR3: 0000000075458000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 vma_end_read+0x35/0x170 include/linux/mm.h:740
 do_user_addr_fault arch/x86/mm/fault.c:1340 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x4c8/0x8b0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f0c09b76cc6
Code: f0 72 6e 48 63 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
RSP: 002b:00007ffd39078e70 EFLAGS: 00010206
RAX: 0000000000ce2001 RBX: 00007ffd39078f10 RCX: 00000000000000d7
RDX: 0000000000000015 RSI: 0000000000000001 RDI: 00007ffd39078fb0
RBP: 0000000000000102 R08: 00007f0c01600000 R09: 0000000000ce2000
R10: 0000000000000000 R11: 00007ffd39078f20 R12: 0000000000000001
R13: 00007f0c09c03800 R14: 0000000000000000 R15: 00007ffd39078fb0
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.144 msecs