bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3 building syzkaller on 04ca72cd45348daab9d896bbec8ea4c2d13455ac testing commit b98aebd298246df37b472c52a2ee1023256d02e3 with gcc (GCC) 8.1.0 kernel signature: 7fa26629d3bae6e13a4cc0bb490a8f1f7d4a1b625f076f2a8ee95ad9476d4c48 all runs: crashed: general protection fault in ip6_dst_destroy testing current HEAD 4520f06b03ae667e442da1ab9351fd28cd7ac598 testing commit 4520f06b03ae667e442da1ab9351fd28cd7ac598 with gcc (GCC) 8.1.0 kernel signature: 22ccffdfd24261ad4533f125457cecfb55f881500fc45b899b07ac8f6aa64b8d all runs: crashed: general protection fault in ip6_dst_destroy revisions tested: 2, total time: 24m28.424114932s (build: 17m34.490732814s, test: 5m52.435504781s) the crash still happens on HEAD commit msg: Linux 4.14.175 crash: general protection fault in ip6_dst_destroy IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready kasan: CONFIG_KASAN_INLINE enabled IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.175-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffffffff87876240 task.stack: ffffffff87800000 RIP: 0010:__lock_acquire+0x1d5/0x4500 kernel/locking/lockdep.c:3365 RSP: 0018:ffff8880aee07b30 EFLAGS: 00010006 IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready 8021q: adding VLAN 0 to HW filter on device bond0 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff87916980 RBP: ffff8880aee07cf8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff87876240 R12: 0000000000000018 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ed01db3d48 CR3: 0000000089903000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready lock_acquire+0x173/0x400 kernel/locking/lockdep.c:3994 8021q: adding VLAN 0 to HW filter on device team0 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:176 spin_lock_bh include/linux/spinlock.h:322 [inline] rt6_uncached_list_del net/ipv6/route.c:144 [inline] ip6_dst_destroy+0x100/0x380 net/ipv6/route.c:402 dst_destroy+0xb2/0x2d0 net/core/dst.c:129 IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready dst_destroy_rcu+0xd/0x10 net/core/dst.c:151 __rcu_reclaim kernel/rcu/rcu.h:195 [inline] rcu_do_batch kernel/rcu/tree.c:2699 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] rcu_process_callbacks+0x7e0/0x11e0 kernel/rcu/tree.c:2946 __do_softirq+0x246/0x9b0 kernel/softirq.c:288 IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15f/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x149/0x5d0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready RIP: 0010:native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:61 IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready RSP: 0018:ffffffff87807db8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffffffff87876240 RCX: 0000000000000000 RDX: 1ffffffff0f22d34 RSI: 0000000000000001 RDI: ffffffff879169a0 RBP: ffffffff87807db8 R08: 1ffffffff108b001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87916990 R13: ffffffff8845a060 R14: 0000000000000000 R15: ffffffff87916980 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0x4f/0x370 arch/x86/kernel/process.c:566 IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:557 IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready default_idle_call+0x6d/0x90 kernel/sched/idle.c:98 IPv6: ADDRCONF(NETDEV_UP): veth0_to_hsr: link is not ready cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x311/0x3d0 kernel/sched/idle.c:246 IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351 hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network rest_init+0x193/0x199 init/main.c:434 hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network start_kernel+0x61d/0x642 init/main.c:708 IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:399 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:380 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 Code: 00 00 00 00 8b 84 24 98 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 f2 30 00 00 49 81 3c 24 a0 32 7b 88 0f 84 30 RIP: __lock_acquire+0x1d5/0x4500 kernel/locking/lockdep.c:3365 RSP: ffff8880aee07b30 ---[ end trace 1d3b63e30ae0a2c1 ]---