INFO: task kworker/u10:4:12569 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:4   state:D stack:22072 pid:12569 tgid:12569 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:4)
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 jfs_commit_inode+0x1ca/0x530
 jfs_write_inode+0x145/0x220
 __writeback_single_inode+0x7e1/0x1230
 writeback_sb_inodes+0x92c/0x1820
 wb_writeback+0x445/0xad0
 wb_workfn+0x3f8/0xef0
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.4.1753:22442 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1753      state:D stack:28728 pid:22442 tgid:22433 ppid:19967  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 path_openat+0xb53/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde69b9acb9
RSP: 002b:00007fde6aa92028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fde69e16090 RCX: 00007fde69b9acb9
RDX: 0000000000101042 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007fde69c08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fde69e16128 R14: 00007fde69e16090 R15: 00007ffffcafb4a8
 </TASK>
INFO: task syz.4.1753:22447 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1753      state:D stack:28728 pid:22447 tgid:22433 ppid:19967  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 wb_wait_for_completion+0x372/0x690
 __writeback_inodes_sb_nr+0x24b/0x2c0
 sync_filesystem+0xa3/0x230
 jfs_reconfigure+0xc6/0xa00
 reconfigure_super+0x227/0x8a0
 path_mount+0xd3e/0x1000
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde69b9bf4a
RSP: 002b:00007fde6aa70e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fde6aa70ee0 RCX: 00007fde69b9bf4a
RDX: 0000200000000180 RSI: 0000200000000080 RDI: 0000000000000000
RBP: 0000200000000180 R08: 00007fde6aa70ee0 R09: 0000000003a424bc
R10: 0000000003a424bc R11: 0000000000000246 R12: 0000200000000080
R13: 00007fde6aa70ea0 R14: 0000000000000000 R15: 0000200000004fc0
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by udevd/5281:
2 locks held by getty/5658:
 #0: ffff888114e440a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
1 lock held by udevd/11912:
 #0: ffff88812103a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
3 locks held by kworker/u10:4/12569:
 #0: ffff888161eb7148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900035f7bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff8881b93a81c8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
4 locks held by syz.4.1753/22434:
2 locks held by syz.4.1753/22442:
 #0: ffff888113bbc420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b93a8578 (&type->i_mutex_dir_key#9){++++}-{4:4}, at: path_openat+0xb53/0x3e20
1 lock held by syz.4.1753/22447:
 #0: ffff888113bbc0e0 (&type->s_umount_key#51){++++}-{4:4}, at: path_mount+0xcf8/0x1000
1 lock held by syz.6.1940/23576:
 #0: ffff888113bbc0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/23614:
1 lock held by syz.4.1985/24260:
 #0: ffff888113bbc0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x289/0x3d0
2 locks held by syz.5.2131/25813:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 25813 Comm: syz.5.2131 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:__sanitizer_cov_trace_const_cmp8+0x36/0x90
Code: 08 e2 0c 11 65 8b 15 29 e2 0c 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 6c 16 00 00 00 74 4e 8b 91 48 16 00 00 <83> fa 03 75 43 48 8b 91 50 16 00 00 44 8b 89 4c 16 00 00 49 c1 e1
RSP: 0018:ffffc9000814f738 EFLAGS: 00000246
RAX: ffffffff8205788b RBX: 0000000000000000 RCX: ffff8881116c57c0
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000814f870 R08: ffffea0006b60307 R09: 1ffffd4000d6c060
R10: dffffc0000000000 R11: fffff94000d6c061 R12: 1ffff92001029ef4
R13: dffffc0000000000 R14: ffffea0006b60300 R15: 0000000000001a88
FS:  00007f33c6f916c0(0000) GS:ffff8882a9928000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa87de1198 CR3: 000000019649c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 shmem_add_to_page_cache+0x28b/0xbd0
 shmem_alloc_and_add_folio+0x869/0xf80
 shmem_get_folio_gfp+0x5a9/0x1670
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2e2/0x8f0
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f33c615b58e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f33c6f90da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f33c6f916c0 RCX: 00007f33c615b58e
RDX: 0000000002000000 RSI: 00007f33bbe00000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007f33c6f90ee0 R14: 00007f33c6f90ea0 R15: 00007f33bbe00000
 </TASK>
