INFO: task syz.1.2172:22467 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2172      state:D stack:21992 pid:22467 tgid:22466 ppid:21452  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f741099cdd9
RSP: 002b:00007f7411782028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f7410c15fa0 RCX: 00007f741099cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f7410a32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7410c16038 R14: 00007f7410c15fa0 R15: 00007fff8cb188e8
 </TASK>
INFO: task syz.3.2174:22473 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2174      state:D stack:26296 pid:22473 tgid:22472 ppid:20714  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f324059cdd9
RSP: 002b:00007f32414b2028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f3240815fa0 RCX: 00007f324059cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007f3240632d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3240816038 R14: 00007f3240815fa0 R15: 00007ffc8e0eb2c8
 </TASK>
INFO: task syz.6.2175:22570 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2175      state:D stack:24696 pid:22570 tgid:22569 ppid:22479  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2fe319cdd9
RSP: 002b:00007f2fe400e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2fe3415fa0 RCX: 00007f2fe319cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007f2fe3232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2fe3416038 R14: 00007f2fe3415fa0 R15: 00007ffdd49e4678
 </TASK>

Showing all locks held in the system:
6 locks held by kworker/u8:1/13:
 #0: ffff8881012b5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90000127c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8fdbfc88 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffff888111769128 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420
 #4: ffff888111768258 (&devlink->lock_key#66){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420
 #5: ffffffff8fdce940 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x257/0x2f0
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by dhcpcd/5355:
 #0: ffff888169d426e8 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: netlink_dump+0xe2/0xe10
 #1: ffffffff8fdce940 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200
2 locks held by getty/5438:
 #0: ffff888174e7d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by kworker/1:7/7402:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90003617c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff888169d12230 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
3 locks held by syz-executor/21176:
1 lock held by syz.1.2172/22467:
 #0: ffff888021dfc0d8 (&type->s_umount_key#104){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.2174/22473:
 #0: ffff888021dfc0d8 (&type->s_umount_key#104){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.2175/22570:
 #0: ffff888021dfc0d8 (&type->s_umount_key#104){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.2180/22784:
 #0: ffff888021dfc0d8 (&type->s_umount_key#104){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.2266/23661:
 #0: ffff888021dfc0d8 (&type->s_umount_key#104){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.2279/23740:
 #0: ffff888021dfc0d8 (&type->s_umount_key#104){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.2358/24169:
 #0: ffff888021dfc0d8 (&type->s_umount_key#104){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.2449/24453:
 #0: ffff888021dfc0d8 (&type->s_umount_key#104){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz-executor/25149:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 25172 Comm: syz.3.2619 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+0x49/0x70
Code: 81 fa 00 01 00 00 75 35 83 b9 cc 16 00 00 00 74 2c 8b 91 a8 16 00 00 83 fa 02 75 21 48 8b 91 b0 16 00 00 48 8b 32 48 8d 7e 01 <8b> 89 ac 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 e9 8f 03
RSP: 0018:ffffc900218e7958 EFLAGS: 00000246
RAX: ffffffff84b00343 RBX: 0000000000000000 RCX: ffff88819d510000
RDX: ffffc90037e0c000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900218e7b10 R08: ffff88819b8764c7 R09: 1ffff1103370ec98
R10: dffffc0000000000 R11: ffffed103370ec99 R12: 0000000000001000
R13: ffffea00006f0380 R14: 0000000000001000 R15: dffffc0000000000
FS:  00007fb7496ae6c0(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb73f7bd000 CR3: 00000001bdc62000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 copy_folio_from_iter_atomic+0xe3/0x1ad0
 generic_perform_write+0x5d9/0x8f0
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb74875d60e
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:00007fb7496adda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb7496ae6c0 RCX: 00007fb74875d60e
RDX: 00000000013bd7ef RSI: 00007fb73e400000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007fb7496adee0 R14: 00007fb7496adea0 R15: 00007fb73e400000
 </TASK>
