syzbot has found a reproducer for the following issue on: HEAD commit: b423f5a9a61f Merge tag 'acpi-6.12-rc5' of git://git.kernel.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1393565f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=fd919c0fc1af4272 dashboard link: https://syzkaller.appspot.com/bug?extid=58928048fd1416f1457c compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=122f04a7980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132cbe40580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/49d1d501eff9/disk-b423f5a9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f973ba06cb5d/vmlinux-b423f5a9.xz kernel image: https://storage.googleapis.com/syzbot-assets/a97302c30f3f/bzImage-b423f5a9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+58928048fd1416f1457c@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor295:5876 blocked for more than 143 seconds. Not tainted 6.12.0-rc4-syzkaller-00245-gb423f5a9a61f #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor295 state:D stack:25360 pid:5876 tgid:5876 ppid:5861 flags:0x00024002 Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x185a/0x4b70 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2591 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 io_wq_exit_workers io_uring/io-wq.c:1249 [inline] io_wq_put_and_exit+0x344/0x720 io_uring/io-wq.c:1277 io_uring_clean_tctx+0x168/0x1e0 io_uring/tctx.c:193 io_uring_cancel_generic+0x76a/0x820 io_uring/io_uring.c:3219 io_uring_files_cancel include/linux/io_uring.h:20 [inline] do_exit+0x6a8/0x28e0 kernel/exit.c:895 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdf6e9370f9 RSP: 002b:00007ffcae28c868 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdf6e9370f9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fdf6e9b22d0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf6e9b22d0 R13: 0000000000000000 R14: 00007fdf6e9b2d40 R15: 00007fdf6e908280 </TASK> INFO: task syz-executor295:5878 blocked for more than 145 seconds. Not tainted 6.12.0-rc4-syzkaller-00245-gb423f5a9a61f #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor295 state:D stack:25136 pid:5878 tgid:5878 ppid:5859 flags:0x00024002 Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x185a/0x4b70 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2591 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 io_wq_exit_workers io_uring/io-wq.c:1249 [inline] io_wq_put_and_exit+0x344/0x720 io_uring/io-wq.c:1277 io_uring_clean_tctx+0x168/0x1e0 io_uring/tctx.c:193 io_uring_cancel_generic+0x76a/0x820 io_uring/io_uring.c:3219 io_uring_files_cancel include/linux/io_uring.h:20 [inline] do_exit+0x6a8/0x28e0 kernel/exit.c:895 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdf6e9370f9 RSP: 002b:00007ffcae28c868 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdf6e9370f9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fdf6e9b22d0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf6e9b22d0 R13: 0000000000000000 R14: 00007fdf6e9b2d40 R15: 00007fdf6e908280 </TASK> INFO: task syz-executor295:5880 blocked for more than 147 seconds. Not tainted 6.12.0-rc4-syzkaller-00245-gb423f5a9a61f #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor295 state:D stack:25744 pid:5880 tgid:5880 ppid:5855 flags:0x00024002 Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x185a/0x4b70 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2591 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 io_wq_exit_workers io_uring/io-wq.c:1249 [inline] io_wq_put_and_exit+0x344/0x720 io_uring/io-wq.c:1277 io_uring_clean_tctx+0x168/0x1e0 io_uring/tctx.c:193 io_uring_cancel_generic+0x76a/0x820 io_uring/io_uring.c:3219 io_uring_files_cancel include/linux/io_uring.h:20 [inline] do_exit+0x6a8/0x28e0 kernel/exit.c:895 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdf6e9370f9 RSP: 002b:00007ffcae28c868 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdf6e9370f9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fdf6e9b22d0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf6e9b22d0 R13: 0000000000000000 R14: 00007fdf6e9b2d40 R15: 00007fdf6e908280 </TASK> INFO: task syz-executor295:5884 blocked for more than 148 seconds. Not tainted 6.12.0-rc4-syzkaller-00245-gb423f5a9a61f #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor295 state:D stack:25744 pid:5884 tgid:5884 ppid:5856 flags:0x00024002 Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x185a/0x4b70 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2591 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 io_wq_exit_workers io_uring/io-wq.c:1249 [inline] io_wq_put_and_exit+0x344/0x720 io_uring/io-wq.c:1277 io_uring_clean_tctx+0x168/0x1e0 io_uring/tctx.c:193 io_uring_cancel_generic+0x76a/0x820 io_uring/io_uring.c:3219 io_uring_files_cancel include/linux/io_uring.h:20 [inline] do_exit+0x6a8/0x28e0 kernel/exit.c:895 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdf6e9370f9 RSP: 002b:00007ffcae28c868 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdf6e9370f9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fdf6e9b22d0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf6e9b22d0 R13: 0000000000000000 R14: 00007fdf6e9b2d40 R15: 00007fdf6e908280 </TASK> INFO: task syz-executor295:5887 blocked for more than 150 seconds. Not tainted 6.12.0-rc4-syzkaller-00245-gb423f5a9a61f #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor295 state:D stack:25360 pid:5887 tgid:5887 ppid:5862 flags:0x00024002 Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x185a/0x4b70 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2591 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 io_wq_exit_workers io_uring/io-wq.c:1249 [inline] io_wq_put_and_exit+0x344/0x720 io_uring/io-wq.c:1277 io_uring_clean_tctx+0x168/0x1e0 io_uring/tctx.c:193 io_uring_cancel_generic+0x76a/0x820 io_uring/io_uring.c:3219 io_uring_files_cancel include/linux/io_uring.h:20 [inline] do_exit+0x6a8/0x28e0 kernel/exit.c:895 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdf6e9370f9 RSP: 002b:00007ffcae28c868 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdf6e9370f9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fdf6e9b22d0 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf6e9b22d0 R13: 0000000000000000 R14: 00007fdf6e9b2d40 R15: 00007fdf6e908280 </TASK> Showing all locks held in the system: 3 locks held by kworker/u8:0/11: 1 lock held by khungtaskd/30: #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 3 locks held by kworker/u8:2/35: 3 locks held by kworker/u8:3/52: 3 locks held by kworker/u8:5/148: 2 locks held by getty/5585: #0: ffff88803153f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by iou-wrk-5876/5877: 1 lock held by iou-wrk-5878/5881: 3 locks held by kworker/u8:1/5879: 1 lock held by iou-wrk-5880/5882: 1 lock held by iou-wrk-5884/5885: 1 lock held by iou-wrk-5887/5888: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc4-syzkaller-00245-gb423f5a9a61f #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: 5888 Comm: iou-wrk-5887 Not tainted 6.12.0-rc4-syzkaller-00245-gb423f5a9a61f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:unwind_next_frame+0x17b5/0x22d0 arch/x86/kernel/unwind_orc.c:664 Code: 01 c6 49 8d 55 40 4c 89 ef e8 37 0e 00 00 84 c0 0f 84 66 01 00 00 49 bc 00 00 00 00 00 fc ff df 48 8b 44 24 20 42 0f b6 04 20 <84> c0 0f 85 36 08 00 00 48 8b 6c 24 08 8b 84 24 84 00 00 00 39 45 RSP: 0018:ffffc900041771d0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffffff90add366 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffc90004170000 RDI: ffffc90004177658 RBP: dffffc0000000000 R08: ffffc90004177658 R09: 0000000000000000 R10: ffffc900041772f0 R11: fffff5200082ee60 R12: dffffc0000000000 R13: ffffc900041772a0 R14: ffffffff81fb4fe6 R15: ffffc900041772f0 FS: 000055559112e380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a37bfd3600 CR3: 0000000032e0a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
