================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. swapper/0/0 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888022bea518 (&sighand->siglock){?.+.}-{2:2}, at: __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422 {HARDIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] class_spinlock_constructor include/linux/spinlock.h:530 [inline] ptrace_set_stopped kernel/ptrace.c:391 [inline] ptrace_attach+0x401/0x650 kernel/ptrace.c:478 __do_sys_ptrace+0x204/0x230 kernel/ptrace.c:1290 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x62/0x6a irq event stamp: 166162 hardirqs last enabled at (166161): [] cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388 hardirqs last disabled at (166162): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (166156): [] softirq_handle_end kernel/softirq.c:399 [inline] softirqs last enabled at (166156): [] __do_softirq+0x591/0x8d5 kernel/softirq.c:582 softirqs last disabled at (166151): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (166151): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (166151): [] irq_exit_rcu+0xb5/0x120 kernel/softirq.c:644 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); lock(&sighand->siglock); *** DEADLOCK *** 3 locks held by swapper/0/0: #0: ffff888075adc038 (&new_timer->it_lock){-...}-{2:2}, at: posix_timer_fn+0x2d/0x3d0 kernel/time/posix-timers.c:318 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: send_sigqueue+0x10c/0x840 kernel/signal.c:1978 #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #2: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __lock_task_sighand+0x3f/0x340 kernel/signal.c:1405 stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.7.0-rc1-next-20231117-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3970 [inline] valid_state kernel/locking/lockdep.c:4012 [inline] mark_lock_irq kernel/locking/lockdep.c:4215 [inline] mark_lock+0x91a/0xc50 kernel/locking/lockdep.c:4677 mark_usage kernel/locking/lockdep.c:4563 [inline] __lock_acquire+0x1347/0x3b10 kernel/locking/lockdep.c:5090 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162 __lock_task_sighand+0xc2/0x340 kernel/signal.c:1422 lock_task_sighand include/linux/sched/signal.h:748 [inline] send_sigqueue+0x1d4/0x840 kernel/signal.c:1996 posix_timer_event kernel/time/posix-timers.c:298 [inline] posix_timer_fn+0x181/0x3d0 kernel/time/posix-timers.c:324 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline] RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:113 Code: 08 ed c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 65 48 8b 05 c8 89 82 75 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 98 0a b9 00 fb f4 c3 0f 1f 40 00 0f b6 47 08 3c 01 74 0b 3c 02 74 05 8b 7f 04 eb RSP: 0018:ffffffff8cc07d68 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8a8118d5 RDX: 0000000000000001 RSI: ffff888143af5800 RDI: ffff888143af5864 RBP: ffff888143af5864 R08: 0000000000000001 R09: ffffed1017306dbd R10: ffff8880b9836deb R11: 0000000000000000 R12: ffff888141698000 R13: ffffffff8db1a5c0 R14: 0000000000000000 R15: 0000000000000000 acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:707 cpuidle_enter_state+0x83/0x500 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388 cpuidle_idle_call kernel/sched/idle.c:215 [inline] do_idle+0x314/0x3f0 kernel/sched/idle.c:312 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:410 rest_init+0x16f/0x2b0 init/main.c:730 arch_call_rest_init+0x13/0x30 init/main.c:827 start_kernel+0x39e/0x480 init/main.c:1072 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:555 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:536 secondary_startup_64_no_verify+0x166/0x16b ---------------- Code disassembly (best guess): 0: 08 ed or %ch,%ch 2: c3 ret 3: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 00 e: 66 90 xchg %ax,%ax 10: 65 48 8b 05 c8 89 82 mov %gs:0x758289c8(%rip),%rax # 0x758289e0 17: 75 18: 48 8b 00 mov (%rax),%rax 1b: a8 08 test $0x8,%al 1d: 75 0c jne 0x2b 1f: 66 90 xchg %ax,%ax 21: 0f 00 2d 98 0a b9 00 verw 0xb90a98(%rip) # 0xb90ac0 28: fb sti 29: f4 hlt * 2a: fa cli <-- trapping instruction 2b: c3 ret 2c: 0f 1f 40 00 nopl 0x0(%rax) 30: 0f b6 47 08 movzbl 0x8(%rdi),%eax 34: 3c 01 cmp $0x1,%al 36: 74 0b je 0x43 38: 3c 02 cmp $0x2,%al 3a: 74 05 je 0x41 3c: 8b 7f 04 mov 0x4(%rdi),%edi 3f: eb .byte 0xeb