INFO: task syz-executor:11517 blocked for more than 143 seconds.
      Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21392 pid:11517 tgid:11517 ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5367 [inline]
 __schedule+0x1ac3/0x5090 kernel/sched/core.c:6748
 __schedule_loop kernel/sched/core.c:6825 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6840
 schedule_timeout+0xb1/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x360/0x630 kernel/sched/completion.c:148
 kthread_stop+0x1a1/0x640 kernel/kthread.c:791
 bch2_copygc_stop+0x4f/0x150 fs/bcachefs/movinggc.c:413
 __bch2_fs_read_only+0x47/0x450 fs/bcachefs/super.c:265
 bch2_fs_read_only+0xc80/0x1360 fs/bcachefs/super.c:356
 __bch2_fs_stop+0x107/0x5b0 fs/bcachefs/super.c:634
 generic_shutdown_super+0x139/0x2d0 fs/super.c:642
 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2312
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x422/0x4c0 fs/namespace.c:1435
 task_work_run+0x251/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f353df8e497
RSP: 002b:00007fff9cb46508 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f353e00e08c RCX: 00007f353df8e497
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff9cb465c0
RBP: 00007fff9cb465c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff9cb47650
R13: 00007f353e00e08c R14: 00000000000567e5 R15: 00007fff9cb47690
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8eb3a760 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6761
1 lock held by udevd/5197:
 #0: ffff8880b8739958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:595
2 locks held by getty/5579:
 #0: ffff88803506a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x53d/0x16b0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/11517:
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
 #1: ffff888045280278 (&c->state_lock){+.+.}-{4:4}, at: __bch2_fs_stop+0xff/0x5b0 fs/bcachefs/super.c:633
1 lock held by syz.4.909/13222:
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.1.925/13539:
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
2 locks held by syz.9.956/14125:
 #0: ffff8880281d4420 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x220 fs/splice.c:1157
 #1: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #1: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.7.958/14134:
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.2.1104/15408:
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805cb480e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
2 locks held by syz-executor/15817:
 #0: ffff8880674780e0 (&type->s_umount_key#59){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff8880674780e0 (&type->s_umount_key#59){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff8880674780e0 (&type->s_umount_key#59){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
 #1: ffffffff8eb3fb40 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3774
3 locks held by syz.7.1222/16123:
 #0: ffff8881437e0360 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_set_status+0x2b/0x800 drivers/block/loop.c:1261
 #1: ffff88814376dc88 (&q->q_usage_counter(io)#24){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:928 [inline]
 #1: ffff88814376dc88 (&q->q_usage_counter(io)#24){++++}-{0:0}, at: loop_set_status+0x213/0x800 drivers/block/loop.c:1277
 #2: ffff88814376dcc0 (&q->q_usage_counter(queue)#8){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:928 [inline]
 #2: ffff88814376dcc0 (&q->q_usage_counter(queue)#8){+.+.}-{0:0}, at: loop_set_status+0x213/0x800 drivers/block/loop.c:1277
1 lock held by dhcpcd/16176:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
 watchdog+0x1058/0x10a0 kernel/hung_task.c:399
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 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: 16123 Comm: syz.7.1222 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:record_print_text+0xb0/0x430 kernel/printk/printk.c:1439
Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 a3 c2 86 00 4c 8b 33 4d 8d 66 10 4c 89 e0 48 c1 e8 03 42 0f b6 04 38 <84> c0 0f 85 02 03 00 00 41 0f b7 04 24 48 89 44 24 38 48 8d 7b 10
RSP: 0018:ffffc9000479e940 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffc9000479ebe0 RCX: 0000000000080000
RDX: ffffc9000c54a000 RSI: 000000000000e660 RDI: 000000000000e661
RBP: ffffc9000479ea70 R08: ffffffff81a21d99 R09: ffffffff81a3734d
R10: 0000000000000003 R11: ffff88802b083c00 R12: ffffc9000479eb70
R13: 1ffff920008f3d34 R14: ffffc9000479eb60 R15: dffffc0000000000
FS:  00007f2c0a3c96c0(0000) GS:ffff88812525a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1eda93d3b0 CR3: 000000003e632000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 printk_get_next_message+0x65b/0x8b0 kernel/printk/printk.c:3006
 console_emit_next_record kernel/printk/printk.c:3074 [inline]
 console_flush_all+0x56b/0xec0 kernel/printk/printk.c:3208
 __console_flush_and_unlock kernel/printk/printk.c:3267 [inline]
 console_unlock+0x151/0x3b0 kernel/printk/printk.c:3307
 vprintk_emit+0x732/0xa10 kernel/printk/printk.c:2432
 _printk+0xd5/0x120 kernel/printk/printk.c:2457
 set_capacity_and_notify+0x215/0x2d0 block/genhd.c:93
 loop_set_size drivers/block/loop.c:234 [inline]
 loop_set_status+0x496/0x800 drivers/block/loop.c:1292
 lo_ioctl+0xcef/0x2870 drivers/block/loop.c:-1
 blkdev_ioctl+0x5df/0x710 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2c0958d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2c0a3c9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2c097a5fa0 RCX: 00007f2c0958d169
RDX: 0000200000000140 RSI: 0000000000004c02 RDI: 0000000000000005
RBP: 00007f2c0960e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2c097a5fa0 R15: 00007ffefc483c78
 </TASK>