INFO: task syz.3.1457:13902 blocked for more than 143 seconds.
      Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1457      state:D stack:23344 pid:13902 tgid:13900 ppid:13105  task_flags:0x400140 flags:0x00024006
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 io_schedule+0x80/0xd0
 folio_wait_bit_common+0x6b0/0xb90
 migrate_pages_batch+0x15c9/0x3620
 migrate_pages+0x2038/0x2930
 compact_zone+0x23e1/0x4ab0
 sysctl_compaction_handler+0x3a4/0x7b0
 proc_sys_call_handler+0x4c6/0x700
 iter_file_splice_write+0x93a/0x1000
 direct_splice_actor+0x101/0x160
 splice_direct_to_actor+0x5a8/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0xd9/0x190
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe8598ebe9
RSP: 002b:00007fbe867b0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fbe85bb5fa0 RCX: 00007fbe8598ebe9
RDX: 00002000000000c0 RSI: 000000000000000c RDI: 000000000000000d
RBP: 00007fbe85a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000fffffff2 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbe85bb6038 R14: 00007fbe85bb5fa0 R15: 00007ffe603a15f8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/0:2/1273:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90007807bc0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by dhcpcd/5593:
2 locks held by getty/5673:
 #0: ffff888020db00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029032f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by udevd/5853:
 #0: ffff888021bc0358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.3.1457/13902:
 #0: ffff8881091f4428 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160
1 lock held by syz.7.1567/14711:
 #0: ffff888021bc0358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ac/0x340
1 lock held by syz.2.2046/18540:
1 lock held by syz.4.2048/18553:
 #0: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by dhcpcd-run-hook/18570:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #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: 18533 Comm: syz.6.2045 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #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:filter_irq_stacks+0x3c/0xa0
Code: 89 fe 41 89 f4 31 db 49 bd 00 00 00 00 00 fc ff df 49 89 ff 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 e4 d1 76 00 <49> 8b 04 de 48 3d 30 02 00 81 0f 93 c1 48 3d 70 16 00 81 0f 92 c2
RSP: 0018:ffffc9000329f6a8 EFLAGS: 00000246
RAX: 1ffff92000653ef4 RBX: 0000000000000004 RCX: 0000000000000001
RDX: 0000000000002000 RSI: 000000000000000c RDI: ffffc9000329f780
RBP: ffffc9000329f870 R08: 0000000000000000 R09: ffffffff81cea1f6
R10: ffffc9000329f658 R11: ffffffff81ac3890 R12: 000000000000000c
R13: dffffc0000000000 R14: ffffc9000329f780 R15: ffffc9000329f7a0
FS:  00007f2838b456c0(0000) GS:ffff8881a3c24000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b02aeb3a18 CR3: 0000000106ece000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 stack_depot_save_flags+0x40/0x860
 save_stack+0x103/0x1f0
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc4/0xd30
 vfree+0x25a/0x400
 kcov_close+0x28/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2837d8ebe9
Code: Unable to access opcode bytes at 0x7f2837d8ebbf.
RSP: 002b:00007f2838b450e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f2837fb6098 RCX: 00007f2837d8ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2837fb6098
RBP: 00007f2837fb6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2837fb6128 R14: 00007ffc96672480 R15: 00007ffc96672568
 </TASK>
