INFO: task syz.0.753:9674 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.753       state:D stack:27016 pid:9674  tgid:9671  ppid:9528   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 ksys_sync+0x94/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5af0f8ebe9
RSP: 002b:00007f5af1d73038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f5af11c6180 RCX: 00007f5af0f8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5af11c6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5af11c6218 R14: 00007f5af11c6180 R15: 00007ffdca074188
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
6 locks held by kworker/u10:1/36:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff888136625918 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30
 #3: ffffffff99d59cf0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0xbb/0x420
 #4: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa5/0x2390
 #5: ffff888136627a98 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x602/0xc60
2 locks held by getty/5676:
 #0: ffff8881071ef0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc90001ba82f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
7 locks held by kworker/1:4/5914:
 #0: ffff888104ba9148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000388fbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888023c91198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff888109c1f198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #4: ffff8880221f2160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #5: ffff888110e55a20 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #6: ffff8880416ed2b0 (&ldev->lock){+.+.}-{4:4}, at: hidled_recv+0x83/0x370
2 locks held by syz-executor/6920:
1 lock held by syz.0.753/9674:
 #0: ffff88811b9320e0 (&type->s_umount_key#87){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.4.882/10216:
 #0: ffff88811b9320e0 (&type->s_umount_key#87){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.1.1230/12149:
2 locks held by syz.3.1231/12152:

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

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+0x3fc/0x770
 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: 12152 Comm: syz.3.1231 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:rep_movs_alternative+0x75/0x90
Code: 05 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 c3 cc cc cc cc 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc90007197958 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000001000 RCX: 00000000000001f7
RDX: 0000000000000001 RSI: 00007f37c91f7048 RDI: ffff88811c85e048
RBP: ffffc90007197b10 R08: ffff88811c85efff R09: 1ffff1102390bdff
R10: dffffc0000000000 R11: ffffed102390be00 R12: ffff88811c85e000
R13: 00007ffffffff000 R14: 00007f37c91f7000 R15: 0000000000001000
FS:  00007f37d3ea96c0(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f37c9bff000 CR3: 0000000049584000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 copy_folio_from_iter_atomic+0x39e/0x1910
 generic_perform_write+0x5df/0x900
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f37d2f8d69f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f37d3ea8df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f37d2f8d69f
RDX: 0000000001000000 RSI: 00007f37c8c00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000004462
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000003
R13: 00007f37d3ea8ef0 R14: 00007f37d3ea8eb0 R15: 00007f37c8c00000
 </TASK>
