INFO: task syz.5.442:8630 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.442       state:D stack:15048 pid:8630  tgid:8629  ppid:6482   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5360 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
 __schedule_loop kernel/sched/core.c:7046 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7061
 __closure_sync+0x163/0x220 lib/closure.c:146
 closure_sync include/linux/closure.h:195 [inline]
 bch2_direct_IO_read fs/bcachefs/fs-io-direct.c:180 [inline]
 bch2_read_iter+0x1038/0x1440 fs/bcachefs/fs-io-direct.c:215
 new_sync_read fs/read_write.c:491 [inline]
 vfs_read+0x55a/0xa30 fs/read_write.c:572
 ksys_read+0x145/0x250 fs/read_write.c:715
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f995ef8eba9
RSP: 002b:00007f995d1f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f995f1d5fa0 RCX: 00007f995ef8eba9
RDX: 0000000000001000 RSI: 0000200000001400 RDI: 0000000000000004
RBP: 00007f995f011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f995f1d6038 R14: 00007f995f1d5fa0 R15: 00007ffdf6053578
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/31:
 #0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/1:1/43:
 #0: ffff88801a871548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
 #0: ffff88801a871548 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
 #1: ffffc90000b37ba0 ((work_completion)(&sbi->s_error_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
 #1: ffffc90000b37ba0 ((work_completion)(&sbi->s_error_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
 #2: ffff88802cc24088 (&sbi->sb_lock){++++}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2294 [inline]
 #2: ffff88802cc24088 (&sbi->sb_lock){++++}-{4:4}, at: f2fs_record_stop_reason fs/f2fs/super.c:4515 [inline]
 #2: ffff88802cc24088 (&sbi->sb_lock){++++}-{4:4}, at: f2fs_record_error_work+0x59/0x1d0 fs/f2fs/super.c:4667
2 locks held by kworker/u8:4/71:
2 locks held by getty/5623:
 #0: ffff88814cdb30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz.5.442/8630:
 #0: ffff8880241b5b38 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1232
2 locks held by syz-executor/10015:
 #0: ffff8880314920e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
 #0: ffff8880314920e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
 #0: ffff8880314920e0 (&type->s_umount_key#63){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505
 #1: ffffffff8e342180 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3820
1 lock held by syz.0.789/10684:
1 lock held by syz.2.794/10705:
 #0: ffffffff8e3422b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
 #0: ffffffff8e3422b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:957
2 locks held by udevadm/10741:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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:332 [inline]
 watchdog+0xf60/0xfa0 kernel/hung_task.c:495
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 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: 10741 Comm: udevadm Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d a4 ba 1e 0c 48 89 de 5b e9 03 5e 59 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 80 c3 92 65 8b 15 a8 c4
RSP: 0018:ffffc9000ad87588 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: d054b97e5c9ffb00
RDX: ffff88802db7dac0 RSI: ffffffff8c036ee0 RDI: ffffffff8c036ea0
RBP: ffff88801d608c30 R08: ffff88801d608c2f R09: 1ffff11003ac1185
R10: dffffc0000000000 R11: ffffed1003ac1186 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff822fc0b7 R15: ffff88801d608c28
FS:  0000000000000000(0000) GS:ffff8881259e8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa9c384be9c CR3: 000000000e138000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_read_unlock include/linux/rcupdate.h:869 [inline]
 page_table_check_clear+0x48c/0x700 mm/page_table_check.c:89
 ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
 get_and_clear_full_ptes include/linux/pgtable.h:736 [inline]
 zap_present_folio_ptes mm/memory.c:1628 [inline]
 zap_present_ptes mm/memory.c:1710 [inline]
 do_zap_pte_range mm/memory.c:1811 [inline]
 zap_pte_range mm/memory.c:1856 [inline]
 zap_pmd_range mm/memory.c:1948 [inline]
 zap_pud_range mm/memory.c:1977 [inline]
 zap_p4d_range mm/memory.c:1998 [inline]
 unmap_page_range+0x344b/0x4370 mm/memory.c:2019
 unmap_single_vma mm/memory.c:2062 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:2106
 exit_mmap+0x240/0xb40 mm/mmap.c:1280
 __mmput+0x118/0x430 kernel/fork.c:1148
 exit_mm+0x1da/0x2c0 kernel/exit.c:582
 do_exit+0x648/0x2300 kernel/exit.c:954
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
 __do_sys_exit_group kernel/exit.c:1118 [inline]
 __se_sys_exit_group kernel/exit.c:1116 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1116
 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa9c30f16c5
Code: Unable to access opcode bytes at 0x7fa9c30f169b.
RSP: 002b:00007fffae412598 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fa9c31f2fe8 RCX: 00007fa9c30f16c5
RDX: 00000000000000e7 RSI: fffffffffffffe60 RDI: 0000000000000000
RBP: 0000000000000001 R08: 00007fffae412530 R09: 0000000000000000
R10: 00007fffae4123e0 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa9c31f1680 R15: 00007fa9c31f3000
 </TASK>
vkms_vblank_simulate: vblank timer overrun