================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. udevd/5937 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888038a84a18 (&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: 574 hardirqs last enabled at (573): [] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] hardirqs last enabled at (573): [] read_seqbegin include/linux/seqlock.h:847 [inline] hardirqs last enabled at (573): [] zone_span_seqbegin include/linux/memory_hotplug.h:134 [inline] hardirqs last enabled at (573): [] page_outside_zone_boundaries mm/page_alloc.c:450 [inline] hardirqs last enabled at (573): [] bad_range+0x262/0x440 mm/page_alloc.c:469 hardirqs last disabled at (574): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (0): [] copy_process+0x244c/0x9770 kernel/fork.c:2466 softirqs last disabled at (0): [<0000000000000000>] 0x0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sighand->siglock); lock(&sighand->siglock); *** DEADLOCK *** 4 locks held by udevd/5937: #0: ffff888021043658 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:663 [inline] #0: ffff888021043658 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1e2/0x950 mm/memory.c:5506 #1: ffff8880289fc1b0 (&new_timer->it_lock){-...}-{2:2}, at: posix_timer_fn+0x2d/0x3d0 kernel/time/posix-timers.c:318 #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: send_sigqueue+0x10c/0x840 kernel/signal.c:1978 #3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #3: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __lock_task_sighand+0x3f/0x340 kernel/signal.c:1405 stack backtrace: CPU: 0 PID: 5937 Comm: udevd 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:check_kcov_mode kernel/kcov.c:175 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x2d/0x60 kernel/kcov.c:207 Code: fa 65 48 8b 15 a4 ad 7b 7e 65 8b 05 a5 ad 7b 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 fc 15 00 00 85 c0 74 2b <8b> 82 d8 15 00 00 83 f8 02 75 20 48 8b 8a e0 15 00 00 8b 92 dc 15 RSP: 0000:ffffc90014eff3c8 EFLAGS: 00000246 RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffffff813a4872 RDX: ffff888023538000 RSI: ffffffff813a3671 RDI: 0000000000000005 RBP: ffffc90014effb60 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: dffffc0000000000 R12: ffffc90014ef8000 R13: ffffc90014f00000 R14: ffffc90014effb68 R15: ffffc90014effa90 unwind_next_frame+0x51/0x2390 arch/x86/kernel/unwind_orc.c:476 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 save_stack+0x15e/0x1f0 mm/page_owner.c:130 __set_page_owner+0x1f/0x60 mm/page_owner.c:196 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa16/0x3690 mm/page_alloc.c:3344 __alloc_pages+0x22d/0x2400 mm/page_alloc.c:4600 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 vma_alloc_folio+0xad/0x220 mm/mempolicy.c:2172 wp_page_copy mm/memory.c:3125 [inline] do_wp_page+0xd8d/0x36b0 mm/memory.c:3516 handle_pte_fault mm/memory.c:5060 [inline] __handle_mm_fault+0x1d7d/0x3d70 mm/memory.c:5185 handle_mm_fault+0x476/0xa00 mm/memory.c:5350 do_user_addr_fault+0x309/0x1000 arch/x86/mm/fault.c:1364 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7fd96bec72a4 Code: c0 02 49 8b 0c c6 64 8b 34 25 18 00 00 00 85 f6 75 22 48 39 cd 75 0c 48 8d 3d 24 e6 0e 00 e9 66 fe ff ff 48 c1 ea 0c 48 31 ca <48> 89 55 10 49 89 2c c6 eb 3c 89 d8 48 c1 ea 0c 48 89 ce 49 8d 3c RSP: 002b:00007ffea9239540 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000002 RCX: 0000563776322d60 RDX: 0000563215454e73 RSI: 0000000000000000 RDI: 0000563776313a60 RBP: 0000563776313a50 R08: 0000000000000007 R09: 6346bdd1638743bd R10: 4d9d393bdc8b9ffe R11: 0000000000000007 R12: 0000000000000000 R13: 0000563776313a70 R14: 00007fd96bff1aa0 R15: 00005637762ce910 ---------------- Code disassembly (best guess): 0: fa cli 1: 65 48 8b 15 a4 ad 7b mov %gs:0x7e7bada4(%rip),%rdx # 0x7e7badad 8: 7e 9: 65 8b 05 a5 ad 7b 7e mov %gs:0x7e7bada5(%rip),%eax # 0x7e7badb5 10: a9 00 01 ff 00 test $0xff0100,%eax 15: 48 8b 34 24 mov (%rsp),%rsi 19: 74 0f je 0x2a 1b: f6 c4 01 test $0x1,%ah 1e: 74 35 je 0x55 20: 8b 82 fc 15 00 00 mov 0x15fc(%rdx),%eax 26: 85 c0 test %eax,%eax 28: 74 2b je 0x55 * 2a: 8b 82 d8 15 00 00 mov 0x15d8(%rdx),%eax <-- trapping instruction 30: 83 f8 02 cmp $0x2,%eax 33: 75 20 jne 0x55 35: 48 8b 8a e0 15 00 00 mov 0x15e0(%rdx),%rcx 3c: 8b .byte 0x8b 3d: 92 xchg %eax,%edx 3e: dc .byte 0xdc 3f: 15 .byte 0x15