INFO: task syz.3.697:16874 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc7-syzkaller-00191-gfda5e3f28400 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.697       state:D stack:28208 pid:16874 tgid:16633 ppid:14309  flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
 __mutex_lock_common kernel/locking/mutex.c:665 [inline]
 __mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
 fdget_pos+0x254/0x320 fs/file.c:1192
 class_fd_pos_constructor include/linux/file.h:85 [inline]
 ksys_write+0x7c/0x2b0 fs/read_write.c:722
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08c9185d29
RSP: 002b:00007f08c9f6c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f08c9376080 RCX: 00007f08c9185d29
RDX: 0000000000000003 RSI: 0000000020000000 RDI: 0000000000000006
RBP: 00007f08c9201b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f08c9376080 R15: 00007ffd8196b1c8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc7-syzkaller-00191-gfda5e3f28400 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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+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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16864 Comm: bch-copygc/loop Not tainted 6.13.0-rc7-syzkaller-00191-gfda5e3f28400 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:bch2_btree_path_verify_level+0x0/0x1970 fs/bcachefs/btree_iter.c:140
Code: 80 e1 07 fe c1 38 c1 0f 8c 7d fb ff ff 4c 89 f7 e8 c5 99 e8 fd e9 70 fb ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc9000d3f6be8 EFLAGS: 00000202
RAX: ffffffff841a9c19 RBX: 0000000000000149 RCX: ffff888072780000
RDX: 0000000000000002 RSI: ffff888065874360 RDI: ffff888065874000
RBP: 0000000000000068 R08: ffffffff841a9bd4 R09: 0000000000000000
R10: ffffc9000d3f6a40 R11: fffff52001a7ed4d R12: 0000000000000002
R13: ffff888065874000 R14: 1ffff1100cb0e86f R15: ffff888065874360
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a9c1249950 CR3: 000000000e736000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 bch2_btree_path_verify+0xb0/0x300 fs/bcachefs/btree_iter.c:232
 bch2_btree_iter_peek_node+0x131/0xed0 fs/bcachefs/btree_iter.c:1899
 bch2_backpointer_get_node+0x2d2/0x880 fs/bcachefs/backpointers.c:369
 bch2_evacuate_bucket+0x12fd/0x3610 fs/bcachefs/move.c:772
 bch2_copygc+0x42c1/0x4c90 fs/bcachefs/movinggc.c:240
 bch2_copygc_thread+0x736/0xc10 fs/bcachefs/movinggc.c:381
 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
 </TASK>