INFO: task syz.2.279:7404 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.279       state:D stack:24960 pid:7404  tgid:7403  ppid:7105   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0f5339c799
RSP: 002b:00007f0f542ee028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f0f53615fa0 RCX: 00007f0f5339c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f0f53615fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0f53616038 R14: 00007f0f53615fa0 R15: 00007ffe1aeb3958
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5634:
 #0: ffff8881792350a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by syz-executor/5810:
3 locks held by syz-executor/5815:
2 locks held by syz-executor/5816:
3 locks held by syz-executor/6279:
4 locks held by syz-executor/6314:
2 locks held by syz-executor/6329:
3 locks held by syz-executor/6898:
2 locks held by syz-executor/6930:
4 locks held by syz-executor/7084:
1 lock held by syz.2.279/7404:
 #0: ffff8881755460e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.339/7708:
 #0: ffff88801b2900e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.412/8010:
 #0: ffff8881755460e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.6.451/8205:
 #0: ffff888021f940e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.525/8499:
 #0: ffff888113c220e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.539/8566:
 #0: ffff8881755460e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.3.540/8572:

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

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+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: 8572 Comm: syz.3.540 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:shmem_get_folio_gfp+0x3d0/0x1670
Code: 60 ba ff 41 83 ff ef 0f 85 30 06 00 00 e8 08 5c ba ff 44 8b 3c 24 e9 bd fd ff ff 48 8b 44 24 60 42 80 3c 28 00 48 8b 6c 24 50 <74> 08 48 89 ef e8 76 a5 24 00 48 c7 45 00 00 00 00 00 48 8b 7c 24
RSP: 0018:ffffc90003bf79e0 EFLAGS: 00000246
RAX: 1ffff9200077ef5b RBX: 0000000000000000 RCX: ffff88816bc63a80
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003bf7ad8 R08: ffff88816bc63a80 R09: 0000000000000003
R10: 0000000000000406 R11: 0000000000000002 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000010 R15: 0000000000000003
FS:  00007fbaa72146c0(0000) GS:ffff8882a9459000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba9d3bd000 CR3: 0000000034dfe000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 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+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbaa635cfce
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:00007fbaa7213da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbaa72146c0 RCX: 00007fbaa635cfce
RDX: 00000000013bd7ef RSI: 00007fba9c000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007fbaa7213ee0 R14: 00007fbaa7213ea0 R15: 00007fba9c000000
 </TASK>
