Warning: Permanently added '10.128.1.19' (ED25519) to the list of known hosts. [ 411.190343][T29835] [ 411.192760][T29835] ================================ [ 411.197845][T29835] WARNING: inconsistent lock state [ 411.202929][T29835] 6.7.0-rc1-syzkaller #0 Not tainted [ 411.208253][T29835] -------------------------------- [ 411.213600][T29835] inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. [ 411.220583][T29835] syz-executor193/29835 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 411.227670][T29835] ffff888106a81a58 (&sighand->siglock){?.-.}-{2:2}, at: ptrace_attach+0x18b/0x2a0 [ 411.236927][T29835] {IN-HARDIRQ-W} state was registered at: [ 411.242610][T29835] lock_acquire+0xcd/0x2d0 [ 411.247246][T29835] _raw_spin_lock_irqsave+0x3a/0x50 [ 411.252678][T29835] __lock_task_sighand+0x67/0x1a0 [ 411.257761][T29835] send_sigqueue+0xac/0x350 [ 411.262398][T29835] posix_timer_fn+0x58/0xc0 [ 411.266978][T29835] __hrtimer_run_queues+0x199/0x330 [ 411.272313][T29835] hrtimer_interrupt+0xfd/0x230 [ 411.277390][T29835] __sysvec_apic_timer_interrupt+0x7e/0x1b0 [ 411.283337][T29835] sysvec_apic_timer_interrupt+0x8b/0xb0 [ 411.289193][T29835] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 411.295222][T29835] _raw_spin_unlock_irqrestore+0x31/0x70 [ 411.300994][T29835] do_timer_settime+0xe7/0x110 [ 411.305805][T29835] __x64_sys_timer_settime+0xee/0x110 [ 411.311228][T29835] do_syscall_64+0x40/0xe0 [ 411.315779][T29835] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 411.321720][T29835] irq event stamp: 299 [ 411.325837][T29835] hardirqs last enabled at (299): [] _raw_spin_unlock_irqrestore+0x4e/0x70 [ 411.336057][T29835] hardirqs last disabled at (298): [] _raw_spin_lock_irqsave+0x4e/0x50 [ 411.346164][T29835] softirqs last enabled at (234): [] fpu_clone+0xf9/0x2e0 [ 411.354912][T29835] softirqs last disabled at (232): [] fpu_clone+0xcc/0x2e0 [ 411.363806][T29835] [ 411.363806][T29835] other info that might help us debug this: [ 411.372090][T29835] Possible unsafe locking scenario: [ 411.372090][T29835] [ 411.379591][T29835] CPU0 [ 411.382928][T29835] ---- [ 411.386175][T29835] lock(&sighand->siglock); [ 411.390947][T29835] [ 411.394379][T29835] lock(&sighand->siglock); [ 411.399192][T29835] [ 411.399192][T29835] *** DEADLOCK *** [ 411.399192][T29835] [ 411.407391][T29835] 2 locks held by syz-executor193/29835: [ 411.413080][T29835] #0: ffff888104e8d688 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: ptrace_attach+0xad/0x2a0 [ 411.423456][T29835] #1: ffffffff82406098 (tasklist_lock){++++}-{2:2}, at: ptrace_attach+0x12e/0x2a0 [ 411.433046][T29835] [ 411.433046][T29835] stack backtrace: [ 411.438942][T29835] CPU: 0 PID: 29835 Comm: syz-executor193 Not tainted 6.7.0-rc1-syzkaller #0 [ 411.447659][T29835] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 [ 411.457677][T29835] Call Trace: [ 411.461110][T29835] [ 411.464018][T29835] dump_stack_lvl+0x5c/0xb0 [ 411.468489][T29835] mark_lock+0x698/0x7d0 [ 411.473048][T29835] ? select_task_rq_fair+0x1f8/0x1560 [ 411.478569][T29835] ? find_held_lock+0x2b/0x80 [ 411.483395][T29835] __lock_acquire+0x399/0x1ab0 [ 411.488124][T29835] ? do_raw_spin_unlock+0x53/0xa0 [ 411.493116][T29835] ? _raw_spin_unlock_irqrestore+0x3b/0x70 [ 411.499157][T29835] ? try_to_wake_up+0x8a/0x7f0 [ 411.503898][T29835] lock_acquire+0xcd/0x2d0 [ 411.508371][T29835] ? ptrace_attach+0x18b/0x2a0 [ 411.513276][T29835] ? _raw_spin_unlock_irqrestore+0x4e/0x70 [ 411.519157][T29835] ? lockdep_hardirqs_on+0x7b/0xc0 [ 411.524322][T29835] _raw_spin_lock+0x2e/0x40 [ 411.528789][T29835] ? ptrace_attach+0x18b/0x2a0 [ 411.533651][T29835] ptrace_attach+0x18b/0x2a0 [ 411.538304][T29835] __do_sys_ptrace+0xa1/0x150 [ 411.543341][T29835] do_syscall_64+0x40/0xe0 [ 411.547906][T29835] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 411.554002][T29835] RIP: 0033:0x7faaba080f89 [ 411.558481][T29835] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 [ 411.578398][T29835] RSP: 002b:00007faaba042238 EFLAGS: 00000246 ORIG_RAX: 0000000000000065 [ 411.586963][T29835] RAX: ffffffffffffffda RBX: 00007faa