BUG: spinlock bad magic on CPU#1, BUG: spinlock bad magic on CPU#1, syz.3.20/6131 lock: 0xffff888046117940, .magic: ffffffff, .owner: /-1, .owner_cpu: -1 CPU: 1 UID: 0 PID: 6131 Comm: syz.3.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 spin_bug kernel/locking/spinlock_debug.c:78 [inline] debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline] do_raw_spin_lock.cold+0x37/0x3c kernel/locking/spinlock_debug.c:115 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:156 [inline] _raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:181 __wake_up_common_lock kernel/sched/wait.c:124 [inline] __wake_up_sync_key+0x1c/0x50 kernel/sched/wait.c:188 sock_def_write_space_wfree net/core/sock.c:3780 [inline] sock_wfree+0x5c9/0x7f0 net/core/sock.c:2734 skb_release_head_state+0x35f/0x400 net/core/skbuff.c:1166 skb_release_all net/core/skbuff.c:1186 [inline] __kfree_skb net/core/skbuff.c:1202 [inline] sk_skb_reason_drop+0xc4/0x1b0 net/core/skbuff.c:1241 kfree_skb_reason include/linux/skbuff.h:1329 [inline] kfree_skb include/linux/skbuff.h:1338 [inline] xfrmi_xmit+0xd5c/0x23f0 net/xfrm/xfrm_interface_core.c:589 __netdev_start_xmit include/linux/netdevice.h:5457 [inline] netdev_start_xmit include/linux/netdevice.h:5466 [inline] xmit_one net/core/dev.c:4068 [inline] dev_hard_start_xmit+0x121/0x760 net/core/dev.c:4084 __dev_queue_xmit+0x1bef/0x48d0 net/core/dev.c:5088 dev_queue_xmit include/linux/netdevice.h:3485 [inline] neigh_connected_output+0x3b5/0x5d0 net/core/neighbour.c:1662 neigh_output include/net/neighbour.h:554 [inline] ip6_finish_output2+0xbd8/0x1f10 net/ipv6/ip6_output.c:138 __ip6_finish_output+0x34e/0xdf0 net/ipv6/ip6_output.c:210 ip6_finish_output net/ipv6/ip6_output.c:221 [inline] NF_HOOK_COND include/linux/netfilter.h:314 [inline] ip6_output+0x2a1/0xa50 net/ipv6/ip6_output.c:248 dst_output include/net/dst.h:471 [inline] NF_HOOK include/linux/netfilter.h:325 [inline] ndisc_send_skb+0xa8e/0x1bf0 net/ipv6/ndisc.c:513 ndisc_send_rs+0x129/0x680 net/ipv6/ndisc.c:724 addrconf_rs_timer+0x424/0x880 net/ipv6/addrconf.c:4099 call_timer_fn+0x198/0x5f0 kernel/time/timer.c:1749 expire_timers kernel/time/timer.c:1800 [inline] __run_timers+0x757/0xb00 kernel/time/timer.c:2375 __run_timer_base kernel/time/timer.c:2387 [inline] __run_timer_base kernel/time/timer.c:2379 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2396 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2406 handle_softirqs+0x216/0xa20 kernel/softirq.c:669 __do_softirq kernel/softirq.c:703 [inline] invoke_softirq kernel/softirq.c:542 [inline] __irq_exit_rcu+0x178/0x220 kernel/softirq.c:786 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:220 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:229 Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 8a 1b f7 f5 48 89 df e8 12 72 f7 f5 e8 8d 86 24 f6 fb bf 01 00 00 00 c2 3a e6 f5 65 48 83 3d 51 64 c8 09 00 74 06 5b e9 01 4d 00 00 RSP: 0018:ffffc90003487c28 EFLAGS: 00000206 RAX: 0000000000000517 RBX: ffffffff90cc2ac0 RCX: 0000000000000080 RDX: 0000000000000001 RSI: ffffffff8e629989 RDI: 0000000000000001 RBP: 0000000000000060 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880247aa000 R13: 000000004ce5e1cb R14: ffffffff8be39d00 R15: 0000000000000019 pci_user_write_config_dword+0x150/0x230 drivers/pci/access.c:278 proc_bus_pci_write+0x531/0x5e0 drivers/pci/proc.c:173 pde_write fs/proc/inode.c:330 [inline] proc_reg_write+0x240/0x330 fs/proc/inode.c:342 vfs_write+0x2aa/0x1050 fs/read_write.c:685 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1f2d39fb19 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1f2e2a6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1f2d625fa0 RCX: 00007f1f2d39fb19 RDX: 000000000000007d RSI: 0000200000000240 RDI: 0000000000000003 RBP: 00007f1f2d437b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1f2d626038 R14: 00007f1f2d625fa0 R15: 00007ffeebd3c9f8 ---------------- Code disassembly (best guess): 0: 90 nop 1: f3 0f 1e fa endbr64 5: 53 push %rbx 6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi b: 48 89 fb mov %rdi,%rbx e: 48 83 c7 18 add $0x18,%rdi 12: e8 8a 1b f7 f5 call 0xf5f71ba1 17: 48 89 df mov %rbx,%rdi 1a: e8 12 72 f7 f5 call 0xf5f77231 1f: e8 8d 86 24 f6 call 0xf62486b1 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 c2 3a e6 f5 call 0xf5e63af1 <-- trapping instruction 2f: 65 48 83 3d 51 64 c8 cmpq $0x0,%gs:0x9c86451(%rip) # 0x9c86489 36: 09 00 38: 74 06 je 0x40 3a: 5b pop %rbx 3b: e9 01 4d 00 00 jmp 0x4d41