================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. syz-executor.0/8859 [HC0[0]:SC0[0]:HE1:SE1] takes: ffff8880804fc0d8 (&sighand->siglock){?.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff8880804fc0d8 (&sighand->siglock){?.-.}-{2:2}, at: class_spinlock_constructor include/linux/spinlock.h:530 [inline] ffff8880804fc0d8 (&sighand->siglock){?.-.}-{2:2}, at: ptrace_set_stopped kernel/ptrace.c:391 [inline] ffff8880804fc0d8 (&sighand->siglock){?.-.}-{2:2}, at: ptrace_attach+0x401/0x650 kernel/ptrace.c:478 {IN-HARDIRQ-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_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 debug_lockdep_rcu_enabled+0x18/0x30 kernel/rcu/update.c:320 rcu_read_unlock include/linux/rcupdate.h:776 [inline] pfn_valid include/linux/mmzone.h:2038 [inline] page_table_check_clear mm/page_table_check.c:68 [inline] __page_table_check_pte_clear+0x492/0x5a0 mm/page_table_check.c:158 page_table_check_pte_clear include/linux/page_table_check.h:49 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1301 [inline] zap_pte_range mm/memory.c:1444 [inline] zap_pmd_range mm/memory.c:1587 [inline] zap_pud_range mm/memory.c:1616 [inline] zap_p4d_range mm/memory.c:1637 [inline] unmap_page_range+0x1860/0x2b60 mm/memory.c:1658 unmap_single_vma+0x194/0x2b0 mm/memory.c:1704 unmap_vmas+0x22f/0x490 mm/memory.c:1748 exit_mmap+0x1c1/0xb60 mm/mmap.c:3274 __mmput+0x12a/0x4d0 kernel/fork.c:1367 mmput+0x62/0x70 kernel/fork.c:1389 exit_mm kernel/exit.c:567 [inline] do_exit+0x9a1/0x2ad0 kernel/exit.c:858 do_group_exit+0xd3/0x2a0 kernel/exit.c:1021 get_signal+0x2395/0x2770 kernel/signal.c:2902 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11e/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x62/0x6a irq event stamp: 1491 hardirqs last enabled at (1491): [] irqentry_exit+0x3b/0x80 kernel/entry/common.c:435 hardirqs last disabled at (1490): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (1394): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (1394): [] fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline] softirqs last enabled at (1394): [] fpu_clone+0x342/0xb60 arch/x86/kernel/fpu/core.c:634 softirqs last disabled at (1392): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (1392): [] fpregs_lock arch/x86/include/asm/fpu/api.h:72 [inline] softirqs last disabled at (1392): [] fpu_clone+0x2d7/0xb60 arch/x86/kernel/fpu/core.c:630 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); lock(&sighand->siglock); *** DEADLOCK *** 2 locks held by syz-executor.0/8859: #0: ffff88801f38bb48 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: class_mutex_intr_constructor include/linux/mutex.h:225 [inline] #0: ffff88801f38bb48 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: ptrace_attach+0x1eb/0x650 kernel/ptrace.c:455 #1: ffffffff8cc0a098 (tasklist_lock){++++}-{2:2}, at: class_write_lock_constructor include/linux/spinlock.h:564 [inline] #1: ffffffff8cc0a098 (tasklist_lock){++++}-{2:2}, at: ptrace_attach+0x2c3/0x650 kernel/ptrace.c:464 stack backtrace: CPU: 1 PID: 8859 Comm: syz-executor.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:4586 [inline] __lock_acquire+0x919/0x3b10 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 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 RIP: 0033:0x7f064167cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 RSP: 002b:00007f06423e20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000065 RAX: ffffffffffffffda RBX: 00007f064179bf80 RCX: 00007f064167cae9 RDX: 0000000000000000 RSI: 0000000000000256 RDI: 0000000000000010 RBP: 00007f06416c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f064179bf80 R15: 00007ffe0ff7b7a8