INFO: task syz-executor:6901 blocked for more than 143 seconds.
      Tainted: G        W           syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:18856 pid:6901  tgid:6901  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common kernel/sched/completion.c:121 [inline]
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:153
 kthread_stop+0x194/0x5c0 kernel/kthread.c:790
 bch2_copygc_stop+0x4b/0x120 fs/bcachefs/movinggc.c:438
 __bch2_fs_read_only+0x47/0x5b0 fs/bcachefs/super.c:280
 bch2_fs_read_only+0x42a/0xb00 fs/bcachefs/super.c:366
 __bch2_fs_stop+0x100/0x900 fs/bcachefs/super.c:677
 generic_shutdown_super+0x135/0x2c0 fs/super.c:643
 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2618
 deactivate_locked_super+0xb9/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1375
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdc72d2ff17
RSP: 002b:00007fff4b2c7d88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fdc72db1c05 RCX: 00007fdc72d2ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff4b2c7e40
RBP: 00007fff4b2c7e40 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff4b2c8ed0
R13: 00007fdc72db1c05 R14: 0000000000000005 R15: 00007fff4b2c8f10
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Tainted: G        W           syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xf93/0xfe0 kernel/hung_task.c:491
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11954 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__sanitizer_cov_trace_switch+0x122/0x150 kernel/kcov.c:-1
Code: 28 4d 39 e5 77 8d 49 ff c7 4c 89 3b 4a 89 4c 33 08 4e 89 5c 33 10 4a 89 7c 33 18 4a 89 54 33 20 e9 6e ff ff ff 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 cc cc cc cc cc b9 05 00 00 00 48 85 c0 0f 85 2d
RSP: 0018:ffffc90004a9f440 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff888028e63880 RCX: 0000000000000005
RDX: ffffffff8aef0c49 RSI: ffffffff8f044060 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffff88802f5f5940 R09: 0000000000000003
R10: 0000000000000100 R11: 0000000000000003 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f978e927880(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f978dfa4000 CR3: 000000005853c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 mas_data_end lib/maple_tree.c:1461 [inline]
 mt_validate_nulls lib/maple_tree.c:7567 [inline]
 mt_validate+0x3eb9/0x4390 lib/maple_tree.c:7615
 validate_mm+0xb6/0x4b0 mm/vma.c:651
 __split_vma+0x89c/0x9e0 mm/vma.c:569
 vms_gather_munmap_vmas+0x2ea/0x12f0 mm/vma.c:1359
 do_vmi_align_munmap+0x271/0x440 mm/vma.c:1527
 do_vmi_munmap+0x253/0x2e0 mm/vma.c:1584
 __vm_munmap+0x23b/0x3d0 mm/vma.c:3155
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:1077
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f978ea8c097
Code: 73 01 c3 48 8b 0d 61 2d 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 31 2d 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffc15531cf8 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055e20e88e270 RCX: 00007f978ea8c097
RDX: 000055e20e88e258 RSI: 0000000000000200 RDI: 00007f978dfa5000
RBP: 000055e20e88acc0 R08: 0000000000000000 R09: 0000000000040000
R10: 000055e20e88acb0 R11: 0000000000000246 R12: 00007f978f1697c0
R13: 00007f978f16b39c R14: 0000000000000022 R15: 0000000000000001
 </TASK>