================================ WARNING: inconsistent lock state 6.7.0-rc1-next-20231117-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.5/5118 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88803f6f2e58 (&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: 503068 hardirqs last enabled at (503067): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1386 [inline] hardirqs last enabled at (503067): [] finish_lock_switch kernel/sched/core.c:5153 [inline] hardirqs last enabled at (503067): [] finish_task_switch.isra.0+0x217/0xcb0 kernel/sched/core.c:5271 hardirqs last disabled at (503068): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (502846): [] tcp_close+0x3c/0xc0 net/ipv4/tcp.c:2922 softirqs last disabled at (502844): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (502844): [] release_sock+0x21/0x1f0 net/core/sock.c:3532 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.5/5118: #0: ffff88802674cd88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x58/0x4e0 net/netfilter/x_tables.c:1242 #1: ffff88807973c038 (&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: 1 PID: 5118 Comm: syz-executor.5 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:__kasan_slab_alloc+0x5a/0x90 mm/kasan/common.c:331 Code: 81 fa ff ff 1f 00 77 05 48 85 c0 75 19 41 8b 74 24 1c 40 0f b6 d5 48 89 df e8 32 2d 00 00 41 f6 44 24 09 10 74 1d 48 89 d8 5b <5d> 41 5c 41 5d c3 e8 0b 35 00 00 48 85 db 75 b8 5b 31 c0 5d 41 5c RSP: 0018:ffffc9000433f830 EFLAGS: 00000202 RAX: ffff888019342938 RBX: 0000000000000008 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed1003268528 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000007 R10: ffffed1003268527 R11: 0000000000000002 R12: ffff888013041280 R13: 0000000000000dc0 R14: 0000000000000008 R15: 0000000000000001 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:763 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x195/0x310 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0x4c/0x90 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] __vmalloc_area_node mm/vmalloc.c:3125 [inline] __vmalloc_node_range+0x3e8/0x1530 mm/vmalloc.c:3320 __vmalloc_node mm/vmalloc.c:3385 [inline] vzalloc+0x6b/0x80 mm/vmalloc.c:3458 alloc_counters net/ipv6/netfilter/ip6_tables.c:815 [inline] copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] do_ip6t_get_ctl+0x6b6/0xae0 net/ipv6/netfilter/ip6_tables.c:1669 nf_getsockopt+0x76/0xe0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x1f9/0x2b0 net/ipv6/ipv6_sockglue.c:1492 tcp_getsockopt+0x97/0xf0 net/ipv4/tcp.c:4340 do_sock_getsockopt+0x2e1/0x6c0 net/socket.c:2373 __sys_getsockopt+0x1a1/0x270 net/socket.c:2402 __do_sys_getsockopt net/socket.c:2412 [inline] __se_sys_getsockopt net/socket.c:2409 [inline] __x64_sys_getsockopt+0xbd/0x150 net/socket.c:2409 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: 0033:0x7fd139c7e68a Code: c4 c1 e0 1a 0d 00 00 04 00 89 01 e9 e0 fe ff ff e8 3b 05 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 b0 ff ff ff f7 RSP: 002b:00007fffb25259f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007fffb2525a80 RCX: 00007fd139c7e68a RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007fffb2525a1c R09: 0079746972756365 R10: 00007fffb2525a80 R11: 0000000000000216 R12: 00007fd139d77200 R13: 00007fffb2525a1c R14: 0000000000000000 R15: 00007fd139d78d00 ---------------- Code disassembly (best guess): 0: 81 fa ff ff 1f 00 cmp $0x1fffff,%edx 6: 77 05 ja 0xd 8: 48 85 c0 test %rax,%rax b: 75 19 jne 0x26 d: 41 8b 74 24 1c mov 0x1c(%r12),%esi 12: 40 0f b6 d5 movzbl %bpl,%edx 16: 48 89 df mov %rbx,%rdi 19: e8 32 2d 00 00 call 0x2d50 1e: 41 f6 44 24 09 10 testb $0x10,0x9(%r12) 24: 74 1d je 0x43 26: 48 89 d8 mov %rbx,%rax 29: 5b pop %rbx * 2a: 5d pop %rbp <-- trapping instruction 2b: 41 5c pop %r12 2d: 41 5d pop %r13 2f: c3 ret 30: e8 0b 35 00 00 call 0x3540 35: 48 85 db test %rbx,%rbx 38: 75 b8 jne 0xfffffff2 3a: 5b pop %rbx 3b: 31 c0 xor %eax,%eax 3d: 5d pop %rbp 3e: 41 5c pop %r12