INFO: task syz.3.996:12273 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.996       state:D stack:24696 pid:12273 tgid:12266 ppid:11025  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x15f/0x560
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa64479ce59
RSP: 002b:00007fa645716028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fa644a15fa0 RCX: 00007fa64479ce59
RDX: 0000000000000000 RSI: 0000200000000280 RDI: ffffffff80000701
RBP: 00007fa644832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa644a16038 R14: 00007fa644a15fa0 R15: 00007fffdf21a408
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by dhcpcd/5358:
 #0: ffffffff8fdd1b00 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x32b/0x1b30
2 locks held by getty/5441:
 #0: ffff88816ce0f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/5612:
1 lock held by udevd/5620:
 #0: ffff88823c63aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
2 locks held by syz-executor/5875:
5 locks held by kworker/u8:4/7556:
 #0: ffff8881012b5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900071b7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8fdc2e28 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffffffff8fdd1b00 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0xe5/0x9e0
 #4: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
1 lock held by syz.3.996/12273:
 #0: ffff8881ba9a40d8 (&type->s_umount_key#53){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/13672:
2 locks held by syz-executor/14749:
 #0: ffffffff8f540fa8 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8fdd1b00 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x883/0x1bb0
2 locks held by syz.2.1388/14772:
2 locks held by syz.5.1389/14795:

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

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+0x389/0x470
 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: 5044 Comm: syslogd 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:memcg_rstat_updated+0x27/0x200
Code: 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 48 85 f6 0f 84 d4 01 00 00 48 89 f3 49 89 fe 49 bc 00 00 00 00 00 fc ff df <89> d6 e8 12 8a 85 ff 49 81 c6 58 07 00 00 4c 89 f0 48 c1 e8 03 42
RSP: 0018:ffffc9000487f758 EFLAGS: 00000002
RAX: 1ffff110204db46b RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881026d9c00
RBP: 0000000000000000 R08: ffffea00046cfd87 R09: 1ffffd40008d9fb0
R10: dffffc0000000000 R11: fffff940008d9fb1 R12: dffffc0000000000
R13: ffffffff933bb000 R14: ffff8881026d9c00 R15: ffff8881026d9c00
FS:  00007fb67e3c8380(0000) GS:ffff88818dc87000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30022ff8 CR3: 000000016eba0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 count_memcg_events+0xc5/0x280
 memcg1_commit_charge+0xcc/0x290
 charge_memcg+0x216/0x2b0
 __mem_cgroup_charge+0x25/0x80
 shmem_alloc_and_add_folio+0x7cd/0xf80
 shmem_get_folio_gfp+0x5a9/0x1670
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2e2/0x8f0
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x15f/0x560
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb67e51cbf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe5079e5a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fb67e51cbf2
RDX: 000000000000005e RSI: 0000561c25e69c50 RDI: 0000000000000003
RBP: 0000561c25e69c50 R08: 000000000000c000 R09: 0000000000000000
R10: 0000561c25e69f00 R11: 0000000000000246 R12: 000000000000005e
R13: 00007fb67e3c8300 R14: 0000000000000004 R15: 0000561c25e69a60
 </TASK>
