INFO: task syz.3.1288:17468 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1288      state:D stack:25320 pid:17468 tgid:17441 ppid:16624  task_flags:0x400140 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
 drop_caches_sysctl_handler+0x97/0x170
 proc_sys_call_handler+0x4cb/0x700
 iter_file_splice_write+0x99b/0x1100
 direct_splice_actor+0x101/0x160
 splice_direct_to_actor+0x53a/0xc70
 do_splice_direct+0x195/0x290
 do_sendfile+0x535/0x7c0
 __se_sys_sendfile64+0xdf/0x1a0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffaa0f9acb9
RSP: 002b:00007ffaa1dee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ffaa1216090 RCX: 00007ffaa0f9acb9
RDX: 0000200000002080 RSI: 000000000000000b RDI: 000000000000000c
RBP: 00007ffaa1008bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000023b R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffaa1216128 R14: 00007ffaa1216090 R15: 00007fffcf1b3348
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5637:
 #0: ffff8881739340a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
4 locks held by syz-executor/13374:
2 locks held by syz.3.1288/17468:
 #0: ffff888104b86420 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160
 #1: ffff8881103e00e0 (&type->s_umount_key#94){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.1357/18332:
 #0: ffff8881103e00e0 (&type->s_umount_key#94){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.1571/20160:
 #0: ffff8881103e00e0 (&type->s_umount_key#94){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.1734/20902:
 #0: ffff888021356420 (sb_writers#25){++++}-{0:0}, at: mnt_want_write+0x41/0x90
1 lock held by syz.9.1739/20896:
2 locks held by dhcpcd/20903:

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

NMI backtrace for cpu 1
CPU: 1 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 20896 Comm: syz.9.1739 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:debug_check_no_obj_freed+0x1f1/0x550
Code: 0f 84 44 03 00 00 49 89 ee 49 c1 ee 03 41 80 3c 16 00 74 12 48 89 ef e8 9d 1b 87 fd 48 ba 00 00 00 00 00 fc ff df 48 8b 45 00 <48> 89 04 24 4c 8d 7d 18 4c 89 f8 48 c1 e8 03 80 3c 10 00 74 12 4c
RSP: 0018:ffffc90007ecf450 EFLAGS: 00000046
RAX: ffff888109869888 RBX: 0000000000000004 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90007ecf3c0
RBP: ffff88816b02a460 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000fd9e78 R12: ffff888119ac2000
R13: ffff888119ac1000 R14: 1ffff1102d60548c R15: ffff888192e47250
FS:  00007f25056fa6c0(0000) GS:ffff88818e326000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ab7477690 CR3: 0000000115542000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 free_unref_folios+0x4d6/0x14d0
 folios_put_refs+0x58a/0x680
 shmem_undo_range+0x529/0x1570
 shmem_evict_inode+0x240/0x9e0
 evict+0x61e/0xb10
 __dentry_kill+0x209/0x660
 finish_dput+0xc9/0x480
 __fput+0x691/0xa70
 fput_close_sync+0x11f/0x240
 __x64_sys_close+0x7e/0x110
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f250475b58e
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:00007f25056f9da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f25056fa6c0 RCX: 00007f250475b58e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f25056f9ee0 R14: 00007f25056f9ea0 R15: 00007f24fa400000
 </TASK>
