INFO: task syz.9.392:8981 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.392       state:D stack:24648 pid:8981  tgid:8980  ppid:8507   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 wait_for_completion+0x2bf/0x5d0
 f2fs_issue_checkpoint+0x376/0x570
 f2fs_do_sync_file+0x869/0x1860
 f2fs_file_write_iter+0x753/0x2410
 vfs_write+0x5c9/0xb30
 __x64_sys_pwrite64+0x193/0x220
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f390158ebe9
RSP: 002b:00007f39023f2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f39017c5fa0 RCX: 00007f390158ebe9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000005
RBP: 00007f3901611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 00007f39017c6038 R14: 00007f39017c5fa0 R15: 00007ffdc6b377e8
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u9:1/28:
 #0: 
ffff8881001d4948
 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000061fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8881061460e0 (&type->s_umount_key#71){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5676:
 #0: ffff888106d440a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900028382f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/8735:
 #0: ffffffff8e88e5c8 (bio_slab_lock){+.+.}-{4:4}, at: bioset_exit+0x44a/0x690
 #1: ffffffff8e13f880 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570
1 lock held by syz.9.392/8981:
 #0: ffff888106146428 (sb_writers#19){++++}-{0:0}, at: vfs_write+0x211/0xb30
2 locks held by f2fs_ckpt-7:9/8991:
2 locks held by syz-executor/11264:
 #0: ffff888039d6e0e0 (&type->s_umount_key#71){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8e13f880 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570
3 locks held by syz.7.701/11818:
 #0: ffff88803b2aa0e0 (&type->s_umount_key#53/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970
 #1: ffffffff8e12e1c0 (console_lock){+.+.}-{0:0}, at: ktime_get+0x3e/0x1f0
 #2: ffff88802ae0e118 (&xfs_nondir_ilock_class){++++}-{4:4}, at: d_splice_alias_ops+0x80/0x360

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

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+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 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: 11818 Comm: syz.7.701 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+0x11/0x70
Code: 5b e9 43 9d 58 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 a0 92 <65> 8b 15 08 d2 e0 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc9000383f030 EFLAGS: 00000246
RAX: ffffffff84ab3f22 RBX: ffff888021f77800 RCX: ffff888025f73980
RDX: ffffffff84ab3cd2 RSI: ffffffff8e89ba40 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888025f73980 R09: 0000000000000003
R10: 000000000000000d R11: 0000000000000002 R12: ffffc9000383f5a0
R13: 1ffff92000707eb4 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f7a648946c0(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a64873d58 CR3: 000000012e4c8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 blk_mq_issue_direct+0x502/0x660
 blk_mq_dispatch_queue_requests+0x6fe/0x800
 blk_mq_flush_plug_list+0x432/0x550
 __blk_flush_plug+0x3d3/0x4b0
 blk_finish_plug+0x5e/0x90
 __iomap_dio_rw+0x14f3/0x1e30
 iomap_dio_rw+0x45/0xb0
 xfs_file_dio_write_aligned+0x157/0x1b0
 xfs_file_write_iter+0x8b2/0xa60
 iter_file_splice_write+0x975/0x10e0
 direct_splice_actor+0x101/0x160
 splice_direct_to_actor+0x5a8/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0x13e/0x190
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7a6398ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7a64894038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f7a63bc5fa0 RCX: 00007f7a6398ebe9
RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000009
RBP: 00007f7a63a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000ff7e82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7a63bc6038 R14: 00007f7a63bc5fa0 R15: 00007ffd8e003cc8
 </TASK>
