INFO: task kworker/u10:5:6397 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:5   state:D stack:21032 pid:6397  tgid:6397  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:1)
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 f2fs_down_write_trace+0x3e/0x1d0
 f2fs_balance_fs+0x60e/0x840
 f2fs_write_inode+0x3fb/0x5f0
 __writeback_single_inode+0x75a/0x11a0
 writeback_sb_inodes+0x992/0x1a20
 __writeback_inodes_wb+0x111/0x240
 wb_writeback+0x46a/0xb70
 wb_workfn+0xb4c/0xf50
 process_scheduled_works+0xb6e/0x18c0
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: 
ffffffff8e75e520
 (
rcu_read_lock
){....}-{1:3}
, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5631:
 #0: 
ffff8881104100a0
 (
&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
4 locks held by kworker/u10:5/6397:
 #0: 
ffff888162a98948
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_scheduled_works+0xa52/0x18c0
 #1: 
ffffc900082dfc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88811aa6c0e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff88811aa71518 (&sbi->gc_lock){+.+.}-{4:4}
, at: f2fs_down_write_trace+0x3e/0x1d0
8 locks held by syz.1.38944/19617:
2 locks held by syz.5.39676/4995:
 #0: ffff88811aa6c0e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
 #1: ffff88816c418820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c2/0xbd0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 19617 Comm: syz.1.38944 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:unwind_next_frame+0x1aaa/0x23c0
Code: 84 0e 01 48 c7 c7 e0 a2 c9 8b be 70 03 00 00 48 c7 c2 80 a3 c9 8b e8 75 3b 2b 00 48 c7 c7 20 e5 75 8e 4c 89 fe e8 e6 21 2b 00 <e8> e1 d1 34 00 89 d8 48 81 c4 98 00 00 00 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc90000a07df8 EFLAGS: 00000286
RAX: 6076542ef47aa100 RBX: ffffffff90a6d701 RCX: 0000000080000101
RDX: 0000000000000006 RSI: ffffffff8e167b01 RDI: ffffffff8c27bf00
RBP: dffffc0000000000 R08: ffffc90000a08f28 R09: 0000000000000000
R10: ffffc90000a07f18 R11: fffff52000140fe5 R12: ffffc90000a08f38
R13: ffffc90000a01000 R14: ffffc90000a07ec8 R15: ffffffff81767e95
FS:  00007f05c2dc86c0(0000) GS:ffff8882a9460000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012a0 CR3: 0000000177ae2000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x35c/0x760
 cfg80211_inform_single_bss_data+0x952/0x1b70
 cfg80211_inform_bss_data+0x266/0x3c40
 cfg80211_inform_bss_frame_data+0x3c7/0x760
 ieee80211_bss_info_update+0x794/0xa40
 ieee80211_scan_rx+0x552/0xa40
 ieee80211_rx_list+0x29e5/0x3710
 ieee80211_rx_napi+0x1b1/0x3e0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x2da/0x4b0
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:console_flush_all+0x801/0xb20
Code: ff ff e8 a2 f0 20 00 90 0f 0b 90 e9 85 fc ff ff e8 94 f0 20 00 e8 8f 91 09 0a 48 85 db 74 c0 e8 85 f0 20 00 fb 48 8b 5c 24 08 <48> 8b 44 24 20 42 80 3c 20 00 4c 8b 74 24 18 74 08 4c 89 f7 e8 56
RSP: 0018:ffffc900067ae260 EFLAGS: 00000246
RAX: ffffffff81a4b10b RBX: ffffc900067ae3c0 RCX: 0000000000080000
RDX: ffffc90021a2d000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900067ae370 R08: ffffffff90119ab7 R09: 1ffffffff2023356
R10: dffffc0000000000 R11: fffffbfff2023357 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff8f00aae0
 console_unlock+0xd1/0x1c0
 vprintk_emit+0x485/0x560
 _printk+0xdd/0x130
 f2fs_printk+0x48a/0x520
 f2fs_iget+0x23d0/0x5dc0
 do_garbage_collect+0x2cf2/0x7080
 f2fs_gc+0xca2/0x2570
 f2fs_balance_fs+0x657/0x840
 f2fs_punch_hole+0x34a/0x490
 f2fs_fallocate+0x536/0x9b0
 vfs_fallocate+0x669/0x7e0
 madvise_vma_behavior+0x2b76/0x4300
 madvise_walk_vmas+0x573/0xae0
 madvise_do_behavior+0x386/0x540
 do_madvise+0x1fa/0x2e0
 __x64_sys_madvise+0xa6/0xc0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f05c1f9c799
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:00007f05c2dc8028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f05c2215fa0 RCX: 00007f05c1f9c799
RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000200000000000
RBP: 00007f05c2032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f05c2216038 R14: 00007f05c2215fa0 R15: 00007fff6fad15d8
 </TASK>
