INFO: task syz.3.330:9659 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.330       state:D stack:24648 pid:9659  tgid:9657  ppid:8183   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: 0033:0x7f4ed958ec29
RSP: 002b:00007f4eda4d6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f4ed97d5fa0 RCX: 00007f4ed958ec29
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000005
RBP: 00007f4ed9611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4ed97d6038 R14: 00007f4ed97d5fa0 R15: 00007ffe21fec2d8
 </TASK>
INFO: task syz.3.330:9672 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.330       state:D stack:26096 pid:9672  tgid:9657  ppid:8183   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_shutdown+0x111/0x5c0
 __f2fs_ioctl+0x41a8/0xb610
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ed958ec29
RSP: 002b:00007f4eda4b5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4ed97d6090 RCX: 00007f4ed958ec29
RDX: 0000200000000080 RSI: 000000008004587d RDI: 0000000000000009
RBP: 00007f4ed9611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4ed97d6128 R14: 00007f4ed97d6090 R15: 00007ffe21fec2d8
 </TASK>
INFO: task syz.3.330:9673 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.330       state:D stack:25896 pid:9673  tgid:9657  ppid:8183   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_shutdown+0x111/0x5c0
 __f2fs_ioctl+0x41a8/0xb610
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ed958ec29
RSP: 002b:00007f4eda494038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4ed97d6180 RCX: 00007f4ed958ec29
RDX: 0000200000000080 RSI: 000000008004587d RDI: 0000000000000004
RBP: 00007f4ed9611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4ed97d6218 R14: 00007f4ed97d6180 R15: 00007ffe21fec2d8
 </TASK>
INFO: task syz.3.330:9676 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.330       state:D stack:24648 pid:9676  tgid:9657  ppid:8183   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_shutdown+0x111/0x5c0
 __f2fs_ioctl+0x41a8/0xb610
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ed958ec29
RSP: 002b:00007f4eda473038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4ed97d6270 RCX: 00007f4ed958ec29
RDX: 0000200000000080 RSI: 000000008004587d RDI: 000000000000000b
RBP: 00007f4ed9611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4ed97d6308 R14: 00007f4ed97d6270 R15: 00007ffe21fec2d8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u10:1/36:
 #0: ffff8881026fc948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900006afbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8881087420e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
1 lock held by klogd/5286:
2 locks held by getty/5675:
 #0: ffff888021e930a0 (&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
1 lock held by syz.3.330/9659:
 #0: ffff888108742428 (sb_writers#16){.+.+}-{0:0}, at: vfs_write+0x211/0xb30
1 lock held by syz.3.330/9672:
 #0: ffff888108742428 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200
1 lock held by syz.3.330/9673:
 #0: ffff888108742428 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200
1 lock held by syz.3.330/9676:
 #0: ffff888108742428 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200
2 locks held by f2fs_ckpt-7:3/9668:
1 lock held by dhcpcd/9818:
 #0: ffff888034a7e808 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: sock_close+0x9b/0x240
2 locks held by syz-executor/9969:
1 lock held by syz-executor/12550:
1 lock held by syz.0.628/12811:
2 locks held by syz.8.625/12815:
2 locks held by dhcpcd/12825:
1 lock held by udevadm/12853:
1 lock held by dhcpcd-run-hook/12854:

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

NMI backtrace for cpu 0
CPU: 0 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+0x439/0x7d0
 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: 12825 Comm: dhcpcd 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:__rcu_read_lock+0x2a/0x60
Code: f3 0f 1e fa 53 65 48 8b 1c 25 08 e0 a0 92 48 81 c3 44 04 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 18 ff 03 8b 03 3d 00 00 00 40 7d 07 5b c3 cc cc cc cc cc
RSP: 0018:ffffc900031af228 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffff88801cafa104 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: ffffffff82142b96 RDI: ffffc900031af308
RBP: dffffc0000000000 R08: ffffc900031af3d0 R09: 0000000000000007
R10: ffffc900031af358 R11: ffffffff81ac3b00 R12: 1ffff92000635e61
R13: ffffc900031af340 R14: ffffc900031af308 R15: ffffc900031afa58
FS:  00007fb48d4aa740(0000) GS:ffff8881a3c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb48d683b90 CR3: 000000003e8a8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unwind_next_frame+0x9e/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kmem_cache_free+0x2f6/0x400
 __put_anon_vma+0x12b/0x2d0
 unlink_anon_vmas+0x503/0x670
 free_pgtables+0x72b/0x9c0
 vms_clear_ptes+0x424/0x540
 vms_complete_munmap_vmas+0x206/0x8a0
 do_vmi_align_munmap+0x358/0x420
 do_vmi_munmap+0x253/0x2e0
 __vm_munmap+0x23b/0x3d0
 __x64_sys_munmap+0x60/0x70
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb48d683b97
Code: b8 09 00 00 00 0f 05 48 3d 00 f0 ff ff 76 0c f7 d8 89 05 dc 46 01 00 48 83 c8 ff c3 0f 1f 80 00 00 00 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d b9 46 01 00 f7 d8 89 01 48 83
RSP: 002b:00007ffe30ba0a58 EFLAGS: 00000202 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055d03c8902f0 RCX: 00007fb48d683b97
RDX: 0000000000000001 RSI: 0000000000023910 RDI: 00007fb48d481000
RBP: 00007ffe30ba0b50 R08: 0000000000000000 R09: f61cf8b096178e41
R10: 00007ffe30ba09e0 R11: 0000000000000202 R12: 00007fb48d697000
R13: 0000000000000000 R14: 000055d03c8902f0 R15: 0000000000000000
 </TASK>
