INFO: task syz-executor:10239 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21768 pid:10239 tgid:10239 ppid:1      task_flags:0x40014c flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 io_schedule+0x80/0xd0
 folio_wait_bit_common+0x6b0/0xb80
 __filemap_get_folio+0x139/0xaf0
 truncate_inode_pages_range+0x3ed/0xda0
 evict+0x517/0x9c0
 evict_inodes+0x64c/0x6d0
 generic_shutdown_super+0x9a/0x2c0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5655b8ec29
RSP: 002b:00007ffdc33949b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f5655c11c52 RCX: 00007f5655b8ec29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000002 R08: 00007ffdc3392757 R09: 00007ffdc3395c70
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdc3395c70
R13: 00007f5655c11c2d R14: 0000555590c754a8 R15: 00007ffdc3397e30
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e33d320 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5676:
 #0: ffff888109ed50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
6 locks held by kworker/u8:4/8669:
 #0: ffff88801baff148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90003defba0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f7322d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x820
 #3: ffff888031eb70e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x10a/0x3d0
 #4: ffff888031eb6250 (&devlink->lock_key#29){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x11c/0x3d0
 #5: ffffffff8e342c80 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570
3 locks held by kworker/0:7/8864:
 #0: ffff88801ac75948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90003fdfba0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8e342db8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by syz-executor/10239:
 #0: ffff88810a63e0e0 (&type->s_umount_key#79){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by dhcpcd/13044:
 #0: ffff888123cb1408 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by syz.8.981/14621:
 #0: ffffffff8e342db8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14638 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kmem_cache_free+0xbc/0x690
Code: 00 00 49 01 c5 0f 1f 44 00 00 41 0f b6 45 33 c1 e0 18 45 31 e4 3d 00 00 00 f5 4d 0f 44 e5 48 89 5c 24 18 66 90 4d 8b 44 24 38 <49> 83 f8 02 0f 92 c0 44 08 c0 a8 01 0f 84 3a 05 00 00 41 f6 c0 02
RSP: 0018:ffffc90002bcf498 EFLAGS: 00000246
RAX: 00000000f5000000 RBX: ffff88810aee7150 RCX: ffff888100014280
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88810aee7320 R08: ffff88810af2e801 R09: 1ffff110045ada24
R10: dffffc0000000000 R11: ffffed10045ada25 R12: ffffea00042bb9c0
R13: ffffea00042bb9c0 R14: ffff888100014280 R15: ffffffff8212536c
FS:  0000000000000000(0000) GS:ffff8880b83fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056254e7be000 CR3: 000000002887c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unlink_anon_vmas+0x2cc/0x670
 free_pgtables+0x72b/0x9c0
 exit_mmap+0x43c/0xb40
 __mmput+0x118/0x430
 exec_mmap+0x6ac/0x7d0
 begin_new_exec+0x12d6/0x2160
 load_elf_binary+0x998/0x2740
 bprm_execve+0x99c/0x1450
 do_execveat_common+0x510/0x6a0
 __x64_sys_execve+0x94/0xb0
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f455e194ef7
Code: Unable to access opcode bytes at 0x7f455e194ecd.
RSP: 002b:00007ffc622b6778 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000056254e7bdf58 RCX: 00007f455e194ef7
RDX: 000056254e7bdf78 RSI: 000056254e7bdf58 RDI: 000056254e7be000
RBP: 000056254e7be000 R08: fefefefefefefeff R09: ffffffffff000000
R10: 000000005e16fb00 R11: 0000000000000246 R12: 000056254e7bdf78
R13: 00007f455e342904 R14: 000056254e7bdf78 R15: 0000000000000000
 </TASK>
