INFO: task syz.6.1019:13998 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1019      state:D stack:28728 pid:13998 tgid:13995 ppid:13392  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 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+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8e1d9acb9
RSP: 002b:00007ff8e2d1a028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007ff8e2016090 RCX: 00007ff8e1d9acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ff8e2016090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8e2016128 R14: 00007ff8e2016090 R15: 00007ffcc1417148
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e341b60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u10:6/88:
 #0: ffff88823c63a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff88823c624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
3 locks held by kworker/u10:18/3923:
2 locks held by getty/5659:
 #0: ffff888113ffc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900033a02f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
3 locks held by kworker/1:12/8398:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}
, at: process_scheduled_works+0x9d4/0x17a0
 #1: 
ffffc90005eefbc0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8e3476b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
2 locks held by syz-executor/12527:
1 lock held by syz.6.1019/13998:
 #0: ffff888114fa60e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.1278/15457:
 #0: ffff888114fa60e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.1419/16282:
 #0: ffff888114fa60e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.1431/16351:
 #0: ffff888114fa60e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/16416:
 #0: ffff8881612d00e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
3 locks held by syz.5.1541/17261:
3 locks held by syz.6.1543/17277:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 17277 Comm: syz.6.1543 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:__add_to_free_list+0x70/0x3c0
Code: 8d 48 c1 e8 03 80 3c 10 00 74 0c 48 c7 c7 30 75 c5 8d e8 e3 1d 0d 00 4c 89 74 24 18 4d 8d ae 80 01 00 00 4c 6b f3 68 4c 89 e6 <48> 2b 35 99 f9 a8 0b 48 c1 fe 06 ba 17 00 00 00 4c 89 e7 e8 58 6b
RSP: 0018:ffffc90005507310 EFLAGS: 00000006
RAX: 1ffffffff1b8aea6 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffea0006cc5740 RDI: ffffea0006cc5740
RBP: 0000000000000001 R08: 0000000000000000 R09: ffff88823fff83d8
R10: dffffc0000000000 R11: ffffed1047fff139 R12: ffffea0006cc5740
R13: ffff88823fff8480 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f102d0636c0(0000) GS:ffff8882a9a08000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4b959ff000 CR3: 000000016b5ec000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 expand+0xa3/0x1b0
 __rmqueue_pcplist+0x100b/0x1c40
 get_page_from_freelist+0x91d/0x2580
 __alloc_frozen_pages_noprof+0x18d/0x380
 alloc_pages_mpol+0x232/0x4a0
 folio_alloc_mpol_noprof+0x39/0x70
 shmem_alloc_and_add_folio+0x445/0xf80
 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+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f102c15b58e
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:00007f102d062da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f102d0636c0 RCX: 00007f102c15b58e
RDX: 00000000013bd7ef RSI: 00007f1021e00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f102d062ee0 R14: 00007f102d062ea0 R15: 00007f1021e00000
 </TASK>
