INFO: task kworker/u10:1:37 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:1   state:D stack:21992 pid:37    tgid:37    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:8)
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
 __writeback_inodes_wb+0x111/0x240
 wb_writeback+0x459/0xad0
 wb_workfn+0xaee/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.9.1231:13272 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.1231      state:D stack:24856 pid:13272 tgid:13271 ppid:12542  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 wb_wait_for_completion+0x372/0x690
 sync_inodes_sb+0x1de/0xbd0
 __iterate_supers+0x13d/0x290
 ksys_sync+0xa0/0x170
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f489559acb9
RSP: 002b:00007f48937f6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f4895815fa0 RCX: 00007f489559acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f4895815fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4895816038 R14: 00007f4895815fa0 R15: 00007ffc7cae57d8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:1/37:
 #0: ffff8881622b8948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90000ad7bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff8881a7b140e0 (&type->s_umount_key#72){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff8881a82d81c8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
2 locks held by getty/5637:
 #0: ffff88816f5b50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
5 locks held by syz.8.1074/12081:
2 locks held by syz.9.1231/13272:
 #0: ffff8881a7b140e0 (&type->s_umount_key#72){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
 #1: ffff88816d116820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c2/0xbd0
2 locks held by syz.6.1420/14634:
 #0: ffff8881a7b140e0 (&type->s_umount_key#72){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
 #1: ffff88816d116820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c2/0xbd0
2 locks held by syz.1.1646/15719:
 #0: ffff8881a7b140e0 (&type->s_umount_key#72){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
 #1: ffff88816d116820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c2/0xbd0
1 lock held by syz.4.1830/16945:
2 locks held by syz.8.1834/16972:
2 locks held by syz.8.1834/16975:
2 locks held by syz.7.1835/16974:

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

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: 12081 Comm: syz.8.1074 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_pc+0x0/0x70
Code: 89 fb e8 23 00 00 00 48 8b 3d 74 3c 15 0c 48 89 de 5b e9 83 ca 5b 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 0d 58 06 0d 11 65 8b 15 79 06 0d
RSP: 0018:ffffc900037d7480 EFLAGS: 00000246
RAX: ffffffff834f6d05 RBX: 0000000000000004 RCX: 0000000000000002
RDX: ffff88816e151d40 RSI: 0000000000000000 RDI: 00000000000000ff
RBP: 0000000000000000 R08: 00000000000001ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888197928000 R14: 0000000000000000 R15: 1ffff11032f25002
FS:  00007fc21028a6c0(0000) GS:ffff8882a9926000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8527bd000 CR3: 000000016e03a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dtSplitRoot+0x77f/0x16c0
 dtInsert+0xedd/0x5de0
 jfs_rename+0x89d/0x1830
 vfs_rename+0xa96/0xeb0
 do_renameat2+0x548/0x900
 __x64_sys_rename+0x82/0x90
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc20f39acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc21028a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007fc20f615fa0 RCX: 00007fc20f39acb9
RDX: 0000000000000000 RSI: 0000200000000a00 RDI: 00002000000009c0
RBP: 00007fc20f408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc20f616038 R14: 00007fc20f615fa0 R15: 00007ffc594b1988
 </TASK>
