bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3
building syzkaller on 04ca72cd45348daab9d896bbec8ea4c2d13455ac
testing commit b98aebd298246df37b472c52a2ee1023256d02e3 with gcc (GCC) 8.1.0
kernel signature: abf9efe37df2451f709da907b52a6a65dab8bf5c
all runs: crashed: general protection fault in ip6_dst_destroy
testing current HEAD a844dc4c544291470aa69edbe2434b040794e269
testing commit a844dc4c544291470aa69edbe2434b040794e269 with gcc (GCC) 8.1.0
kernel signature: f6bedfef95c4f233f6ec458da7cb6b22c4ddb451
all runs: crashed: general protection fault in ip6_dst_destroy
revisions tested: 2, total time: 23m22.793782508s (build: 15m52.947334898s, test: 6m33.777939045s)
the crash still happens on HEAD
commit msg: Linux 4.14.158
crash: general protection fault in ip6_dst_destroy
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: 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: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.158-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a9d22340 task.stack: ffff8880a9d28000
RIP: 0010:__lock_acquire+0x1d5/0x4500 kernel/locking/lockdep.c:3365
RSP: 0018:ffff8880aef07b30 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff879169c0
RBP: ffff8880aef07cf8 R08: 0000000000000001 R09: 0000000000000000
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
R10: 0000000000000001 R11: ffff8880a9d22340 R12: 0000000000000018
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 0000000097e47000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
 lock_acquire+0x173/0x400 kernel/locking/lockdep.c:3994
 __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:143 [inline]
 ip6_dst_destroy+0x100/0x380 net/ipv6/route.c:400
 dst_destroy+0xb2/0x2d0 net/core/dst.c:129
bridge0: port 1(bridge_slave_0) entered blocking state
 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
 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
bridge0: port 1(bridge_slave_0) entered forwarding state
 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792
 </IRQ>
RIP: 0010:native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:61
RSP: 0018:ffff8880a9d2fe58 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: ffff8880a9d22340 RCX: 0000000000000000
RDX: 1ffffffff0f22d3c RSI: 0000000000000001 RDI: ffffffff879169e0
RBP: ffff8880a9d2fe58 R08: 1ffffffff108ae01 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff879169d0
R13: ffffffff88458960 R14: 0000000000000000 R15: ffffffff879169c0
 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
 default_idle+0x4f/0x370 arch/x86/kernel/process.c:566
kobject: 'veth0_to_hsr' (ffff88808a22eaf0): kobject_add_internal: parent: 'net', set: 'devices'
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:557
kobject: 'veth0_to_hsr' (ffff88808a22eaf0): kobject_uevent_env
 default_idle_call+0x6d/0x90 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x311/0x3d0 kernel/sched/idle.c:246
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
 start_secondary+0x355/0x490 arch/x86/kernel/smpboot.c:272
 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 
kobject: 'veth0_to_hsr' (ffff88808a22eaf0): fill_kobj_path: path = '/devices/virtual/net/veth0_to_hsr'
d8 
kobject: 'queues' (ffff88808fa9c248): kobject_add_internal: parent: 'veth0_to_hsr', set: '<NULL>'
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 e0 12 7b 88 0f 84 30 
RIP: __lock_acquire+0x1d5/0x4500 kernel/locking/lockdep.c:3365 RSP: ffff8880aef07b30
---[ end trace 16b7b5ed5a9e3b5f ]---
kobject: 'queues' (ffff88808fa9c248): kobject_uevent_env