INFO: task syz-executor.3:24093 blocked for more than 143 seconds. Not tainted 6.9.0-syzkaller-08544-g4b377b4868ef #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28784 pid:24093 tgid:24080 ppid:5117 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0x17e8/0x4a50 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 vmsplice_to_pipe fs/splice.c:1555 [inline] __do_sys_vmsplice fs/splice.c:1624 [inline] __se_sys_vmsplice+0x5fd/0x1410 fs/splice.c:1598 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4c2ee7cee9 RSP: 002b:00007f4c2e9de0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000116 RAX: ffffffffffffffda RBX: 00007f4c2efac050 RCX: 00007f4c2ee7cee9 RDX: 0000000000000008 RSI: 0000000020000940 RDI: 0000000000000008 RBP: 00007f4c2eec949e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f4c2efac050 R15: 00007fffd6b22998 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4846: #0: ffff88802b3960a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031432f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 2 locks held by kworker/u8:16/8536: 1 lock held by syz-executor.3/24082: #0: ffff888023fce868 (&pipe->mutex){+.+.}-{3:3}, at: splice_file_to_pipe+0x2e/0x500 fs/splice.c:1292 1 lock held by syz-executor.3/24093: #0: ffff888023fce868 (&pipe->mutex){+.+.}-{3:3}, at: vmsplice_to_pipe fs/splice.c:1555 [inline] #0: ffff888023fce868 (&pipe->mutex){+.+.}-{3:3}, at: __do_sys_vmsplice fs/splice.c:1624 [inline] #0: ffff888023fce868 (&pipe->mutex){+.+.}-{3:3}, at: __se_sys_vmsplice+0x5fd/0x1410 fs/splice.c:1598 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 31 Comm: khungtaskd Not tainted 6.9.0-syzkaller-08544-g4b377b4868ef #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xfde/0x1020 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 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 24094 Comm: syz-executor.4 Not tainted 6.9.0-syzkaller-08544-g4b377b4868ef #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:__send_signal_locked+0xb3f/0xdc0 kernel/signal.c:1187 Code: fa e8 85 6b 00 00 31 db 4c 8b 6c 24 30 31 ff 44 89 fe e8 54 0a 3a 00 31 c9 45 85 ff 0f 95 c1 89 ef 4c 89 ee 4c 89 e2 45 89 f0 5c 78 00 00 89 d8 48 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d c3 RSP: 0018:ffffc90010ba7bb0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888020dfda00 RSI: 0000000000000001 RDI: 0000000000000021 RBP: 0000000000000021 R08: 0000000000000000 R09: 0000000000000000 R10: ffff8880820f6560 R11: ffffed101041ecb1 R12: ffff888020dfda00 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00005555844b2480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558b4f1da8 CR3: 000000007473e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_send_sig_info kernel/signal.c:1301 [inline] group_send_sig_info+0x292/0x310 kernel/signal.c:1453 bpf_send_signal_common+0x2dd/0x430 kernel/trace/bpf_trace.c:881 ____bpf_send_signal_thread kernel/trace/bpf_trace.c:898 [inline] bpf_send_signal_thread+0x16/0x20 kernel/trace/bpf_trace.c:896 bpf_prog_b7be628660dc1b90+0x22/0x28 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline] bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2444 trace_sys_exit include/trace/events/syscalls.h:44 [inline] syscall_exit_work+0x171/0x190 kernel/entry/common.c:169 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x273/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0b08a7a667 Code: 0b e9 68 fe ff ff 48 83 c4 18 48 8d 3d f2 01 c6 00 5b 5d 41 5c 41 5d 41 5e 41 5f e9 b3 68 fd ff 0f 1f 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 66 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffd4021a1c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: 0000000000000d5f RBX: 00007ffd4021a330 RCX: 00007f0b08a7a667 RDX: 00007ffd4021a200 RSI: 00007ffd4021a330 RDI: 0000000000000021 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd4021a817 R10: 0000000000000008 R11: 0000000000000202 R12: 00007ffd4021aa10 R13: 00007f0b09761000 R14: 00007f0b097816c0 R15: 00007ffd4021a818