INFO: task syz.3.171:5991 blocked for more than 150 seconds.
      Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.171       state:D stack:21664 pid:5991  tgid:5991  ppid:5237   flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 pipe_release+0x48/0x320 fs/pipe.c:727
 __fput+0x23f/0x880 fs/file_table.c:431
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2e4b7dff9
RSP: 002b:00007ffe61947738 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fe2e4d37a80 RCX: 00007fe2e4b7dff9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fe2e4d37a80 R08: 0000000000000006 R09: 00007ffe61947a2f
R10: 00000000003ffbb8 R11: 0000000000000246 R12: 000000000001383c
R13: 00007ffe61947840 R14: 0000000000000032 R15: ffffffffffffffff
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/u8:1/12:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
8 locks held by udevd/4690:
2 locks held by getty/4989:
 #0: ffff88802e6e10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz.3.171/5991:
 #0: ffff8880791f6468 (&pipe->mutex){+.+.}-{3:3}, at: pipe_release+0x48/0x320 fs/pipe.c:727
1 lock held by syz.3.171/5992:
 #0: ffff8880791f6468 (&pipe->mutex){+.+.}-{3:3}, at: splice_file_to_pipe+0x2e/0x500 fs/splice.c:1292

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4690 Comm: udevd Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:net_tx_action+0x0/0xa50 net/core/dev.c:5259
Code: e4 fe ff ff f3 0f 1e fa e8 6d 11 ff f7 e9 c0 eb ff ff e8 83 10 31 02 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc90000007e38 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 0000000000000100 RCX: ffffffff81579385
RDX: 0000000000000000 RSI: ffffffff8c60fb00 RDI: ffffffff8c60fac0
RBP: ffffc90000007f50 R08: ffffffff901d11af R09: 1ffffffff203a235
R10: dffffc0000000000 R11: ffffffff8995d600 R12: 1ffffffff1cc141a
R13: 0000000000000002 R14: ffffffff8e60a0d0 R15: 0000000000000003
FS:  00007fa887bedc80(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557134dff680 CR3: 000000007a274000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:syscall_enter_from_user_mode_work include/linux/entry-common.h:167 [inline]
RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline]
RIP: 0010:do_syscall_64+0xbc/0x230 arch/x86/entry/common.c:79
Code: ed 00 00 00 48 8b 7d 08 e8 f1 64 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 61 27 d6 f5 90 90 e8 0a 27 d6 f5 fb 49 8b 54 24 08 <f6> c2 3f 74 0e 4c 89 f7 4c 89 fe e8 94 21 b8 f5 49 89 c7 90 90 41
RSP: 0018:ffffc9000324ff10 EFLAGS: 00000282
RAX: 7645437019528800 RBX: ffffc9000324ff10 RCX: ffffffff9a3d3903
RDX: 0000000000000002 RSI: ffffffff8c0acac0 RDI: ffffffff8c60fb20
RBP: ffffc9000324ff48 R08: ffffffff901d11af R09: 1ffffffff203a235
R10: dffffc0000000000 R11: fffffbfff203a236 R12: ffff88807a433c00
R13: 0000000000000000 R14: ffffc9000324ff58 R15: 00000000000000e8
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa887d23457
Code: 73 01 c3 48 8b 0d d1 d9 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 76 48 8b 15 a2 d9 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe8a43df98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 00007ffe8a43e098 RCX: 00007fa887d23457
RDX: 0000000000000008 RSI: 00007ffe8a43e098 RDI: 000000000000000b
RBP: 000000000000000b R08: 000000000ef2817d R09: 7fffffffffffffff
R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000bb8
R13: 0000000200000001 R14: 0000000000000001 R15: 0000000000000000
 </TASK>