INFO: task syz.4.682:8094 blocked for more than 140 seconds. Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.682 state:D stack:25952 pid:8094 tgid:8094 ppid:5847 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 __mutex_lock_common kernel/locking/mutex.c:665 [inline] __mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735 pipe_release+0x48/0x320 fs/pipe.c:727 __fput+0x23c/0xa50 fs/file_table.c:450 task_work_run+0x24f/0x310 kernel/task_work.c:239 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:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8c7f385d29 RSP: 002b:00007ffcbc75f3e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f8c7f577ba0 RCX: 00007f8c7f385d29 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f8c7f577ba0 R08: 00000000000000dc R09: 00007ffcbc75f6df R10: 00007f8c7f577ac0 R11: 0000000000000246 R12: 0000000000028a56 R13: 00007ffcbc75f4f0 R14: 0000000000000032 R15: ffffffffffffffff Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744 2 locks held by kworker/u8:3/52: 3 locks held by udevd/5206: 1 lock held by dhcpcd/5500: 2 locks held by getty/5590: #0: ffff888034fb20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by dhcpcd/5621: 1 lock held by syz-executor/5828: 1 lock held by syz-executor/5829: 1 lock held by syz-executor/5831: 1 lock held by syz-executor/5832: 1 lock held by syz-executor/5847: 1 lock held by udevd/6069: 1 lock held by udevd/6111: 1 lock held by syz.4.682/8094: #0: ffff88806e81a868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x320 fs/pipe.c:727 1 lock held by syz.4.682/8095: #0: ffff88806e81a868 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x2e/0x500 fs/splice.c:1292 1 lock held by syz.1.709/8180: 1 lock held by syz.1.709/8183: 2 locks held by syz-executor/8184: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __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:234 [inline] watchdog+0xff6/0x1040 kernel/hung_task.c:397 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 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 101 PID: 5646 Comm: dhcpcd Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline] RIP: 0010:trace_irq_enable+0x3/0x120 include/trace/events/preemptirq.h:40 Code: c7 05 15 2c 5c 7e 00 00 00 00 c3 cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 56 53 <66> 90 65 8b 05 50 aa 5c 7e 83 f8 08 73 3f 89 c3 48 89 d8 48 c1 e8 RSP: 0018:ffffc90003cbfeb8 EFLAGS: 00000002 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88802710bc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8bc8946f RBP: ffffc90003cbff48 R08: ffffffff8140c84a R09: 1ffff11004e21780 R10: dffffc0000000000 R11: ffffed1004e21781 R12: ffff88802710bc00 R13: 0000000000000000 R14: ffffc90003cbff58 R15: 000000000000010f FS: 00007f73590d2740(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005572f081e198 CR3: 0000000027e0c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on_prepare+0x18/0x30 kernel/trace/trace_preemptirq.c:62 exit_to_user_mode include/linux/entry-common.h:360 [inline] syscall_exit_to_user_mode+0x1cf/0x340 kernel/entry/common.c:220 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x5572c4cb4f1a Code: ff 80 bd a0 01 00 00 03 74 bc 48 8d 3d 74 a3 02 00 31 c0 e8 d0 12 00 00 eb ac 48 81 c4 a0 00 00 00 5b 5d 41 5c 41 5d 41 5e c3 <48> 8b 05 df 06 04 00 48 83 f8 05 74 1c 48 8b 05 d2 06 04 00 48 8d RSP: 002b:00007ffc28cfdaf8 EFLAGS: 00000246 ORIG_RAX: 000000000000010f RAX: 0000000000000000 RBX: 00005572f0811ee0 RCX: 00007f735919fad5 RDX: 00007ffc28cfdb00 RSI: 00007ffc28cfdc30 RDI: 0000000000000011 RBP: 00007ffc28cfe3e0 R08: 0000000000000008 R09: 0000000000000000 R10: 00007ffc28cfe3e0 R11: 0000000000000246 R12: 0000000000000000 R13: 00005572c4cf5610 R14: 00000000ffffffff R15: 0000000000000000