INFO: task syz-executor.1:5294 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:23728 pid:5294  tgid:5294  ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 __bch2_fs_stop+0x45c/0x540 fs/bcachefs/super.c:630
 generic_shutdown_super+0x159/0x3d0 fs/super.c:642
 bch2_kill_sb+0x3b/0x50 fs/bcachefs/fs.c:2037
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa9fae7e1d7
RSP: 002b:00007ffe0ce81eb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa9fae7e1d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe0ce81f70
RBP: 00007ffe0ce81f70 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe0ce83020
R13: 00007fa9faed9636 R14: 000000000005aa0f R15: 0000000000000003
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
3 locks held by kworker/1:1/45:
 #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206
 #1: ffffc90000b57d80 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207
 #2: ffff8880b933ec18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
2 locks held by kworker/u8:7/2886:
2 locks held by getty/4841:
 #0: ffff88802b1640a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201
2 locks held by syz-fuzzer/5083:
1 lock held by syz-executor.1/5294:
 #0: ffff88807c9b20e0 (&type->s_umount_key#94){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88807c9b20e0 (&type->s_umount_key#94){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88807c9b20e0 (&type->s_umount_key#94){++++}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:505
1 lock held by syz-executor.4/9321:
4 locks held by syz-executor.0/10587:
1 lock held by syz-executor.2/10596:
 #0: ffffffff8dbbd0b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:323

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

NMI backtrace for cpu 1
CPU: 1 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf86/0x1240 kernel/hung_task.c:379
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 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 PID: 5083 Comm: syz-fuzzer Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:unwind_next_frame+0x11ff/0x23a0 arch/x86/kernel/unwind_orc.c:672
Code: 50 00 49 39 ef 0f 83 b5 0a 00 00 e8 6b fc 50 00 bf 01 00 00 00 e8 21 a1 20 00 31 ff 65 8b 1d 50 f0 c6 7e 89 de e8 51 f7 50 00 <85> db 0f 84 7f 0a 00 00 bb 01 00 00 00 e9 3b ee ff ff e8 3a fc 50
RSP: 0018:ffffc9000320f0d8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000080000000 RCX: ffffffff813ce8ff
RDX: ffff888077288000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc9000320ff28 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffffc90003208000
R13: ffffc90003210000 R14: ffffc9000320ff30 R15: ffffc9000320ff18
FS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa512ad9000 CR3: 000000004f8f2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 save_stack+0x162/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x8d/0x400 mm/page_owner.c:297
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1088 [inline]
 free_unref_folios+0x991/0x1310 mm/page_alloc.c:2632
 folios_put_refs+0x487/0x6d0 mm/swap.c:1024
 free_pages_and_swap_cache+0x36d/0x510 mm/swap_state.c:329
 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
 tlb_flush_mmu+0xe9/0x590 mm/mmu_gather.c:373
 zap_pte_range mm/memory.c:1691 [inline]
 zap_pmd_range mm/memory.c:1730 [inline]
 zap_pud_range mm/memory.c:1759 [inline]
 zap_p4d_range mm/memory.c:1780 [inline]
 unmap_page_range+0x2042/0x41e0 mm/memory.c:1801
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1847
 unmap_vmas+0x22f/0x490 mm/memory.c:1891
 exit_mmap+0x1b8/0xb20 mm/mmap.c:3341
 __mmput+0x12a/0x4d0 kernel/fork.c:1346
 mmput+0x62/0x70 kernel/fork.c:1368
 exit_mm kernel/exit.c:565 [inline]
 do_exit+0x9b7/0x2ba0 kernel/exit.c:861
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1023
 __do_sys_exit_group kernel/exit.c:1034 [inline]
 __se_sys_exit_group kernel/exit.c:1032 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x472e0b
Code: Unable to access opcode bytes at 0x472de1.
RSP: 002b:000000c0008759c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000472e0b
RDX: 0000000000000002 RSI: 000000000065ba80 RDI: 0000000000000001
RBP: 000000c0008759d8 R08: 0000000000000000 R09: 000000c00011c028
R10: 0000000000000001 R11: 0000000000000202 R12: 0000000000000000
R13: 000000c001154c00 R14: 000000c0000061a0 R15: 000000000000003d
 </TASK>