================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.0/8594 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88805f5ce5d8 (&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: 1994 hardirqs last enabled at (1993): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1386 [inline] hardirqs last enabled at (1993): [] finish_lock_switch kernel/sched/core.c:5153 [inline] hardirqs last enabled at (1993): [] finish_task_switch.isra.0+0x217/0xcb0 kernel/sched/core.c:5271 hardirqs last disabled at (1994): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (516): [] softirq_handle_end kernel/softirq.c:399 [inline] softirqs last enabled at (516): [] __do_softirq+0x591/0x8d5 kernel/softirq.c:582 softirqs last disabled at (503): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (503): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (503): [] 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 *** 4 locks held by syz-executor.0/8594: #0: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: is_bpf_text_address+0x30/0x1a0 kernel/bpf/core.c:733 #1: ffff88807bec81b0 (&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: 8594 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: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:finish_task_switch.isra.0+0x220/0xcb0 kernel/sched/core.c:5273 Code: 90 0a 00 00 44 8b 0d 27 ca bd 0d 45 85 c9 0f 85 bc 01 00 00 48 89 df e8 ce f8 ff ff e8 29 7c 33 00 fb 65 48 8b 1d b0 6f a8 7e <48> 8d bb d8 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc90015db7680 EFLAGS: 00000206 RAX: 00000000000007c9 RBX: ffff888019aabb80 RCX: 1ffffffff1e31619 RDX: 0000000000000000 RSI: ffffffff8accbfe0 RDI: ffffffff8b2f1520 RBP: ffffc90015db76c8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f18e357 R11: 0000000000000001 R12: ffff8880b983d478 R13: ffff888015285940 R14: ffff88807d4df200 R15: ffff8880b993c700 context_switch kernel/sched/core.c:5402 [inline] __schedule+0xf1d/0x5c00 kernel/sched/core.c:6726 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7046 irqentry_exit+0x36/0x80 kernel/entry/common.c:432 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:650 RIP: 0010:lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5721 Code: c1 05 fa 0c 9a 7e 83 f8 01 0f 85 c4 02 00 00 9c 58 f6 c4 02 0f 85 af 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc90015db7940 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff92002bb6f2a RCX: 000000008a5acf67 RDX: 0000000000000001 RSI: ffffffff8accc2e0 RDI: ffffffff8b2f1520 RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff23e33e8 R10: ffffffff91f19f47 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8cfad060 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:301 [inline] rcu_read_lock include/linux/rcupdate.h:747 [inline] is_bpf_text_address+0x36/0x1a0 kernel/bpf/core.c:733 kernel_text_address kernel/extable.c:125 [inline] kernel_text_address+0x85/0xf0 kernel/extable.c:94 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x78/0xe0 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0xbe/0x170 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x24/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc_node_track_caller+0x5a/0x90 mm/slab_common.c:1027 memdup_user+0x2a/0xd0 mm/util.c:197 strndup_user+0x74/0xe0 mm/util.c:256 copy_mount_string fs/namespace.c:3572 [inline] __do_sys_mount fs/namespace.c:3876 [inline] __se_sys_mount fs/namespace.c:3863 [inline] __x64_sys_mount+0x181/0x310 fs/namespace.c:3863 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: 0033:0x7fecf7a7e1ea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007fecf86f6ee8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fecf86f6f80 RCX: 00007fecf7a7e1ea RDX: 00000000200004c0 RSI: 00000000200003c0 RDI: 00007fecf86f6f40 RBP: 00000000200004c0 R08: 00007fecf86f6f80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000200003c0 R13: 00007fecf86f6f40 R14: 00000000000004b5 R15: 00000000200006c0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 00 00 add %al,(%rax) 2: 44 8b 0d 27 ca bd 0d mov 0xdbdca27(%rip),%r9d # 0xdbdca30 9: 45 85 c9 test %r9d,%r9d c: 0f 85 bc 01 00 00 jne 0x1ce 12: 48 89 df mov %rbx,%rdi 15: e8 ce f8 ff ff call 0xfffff8e8 1a: e8 29 7c 33 00 call 0x337c48 1f: fb sti 20: 65 48 8b 1d b0 6f a8 mov %gs:0x7ea86fb0(%rip),%rbx # 0x7ea86fd8 27: 7e * 28: 48 8d bb d8 15 00 00 lea 0x15d8(%rbx),%rdi <-- trapping instruction 2f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 36: fc ff df 39: 48 89 fa mov %rdi,%rdx 3c: 48 rex.W 3d: c1 .byte 0xc1