kasan: CONFIG_KASAN_INLINE enabled
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: 8038 Comm: syz-executor.1 Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88805505a080 task.stack: ffff888055060000
RIP: 0010:__lock_acquire+0x1cc/0x3f20 kernel/locking/lockdep.c:3369
RSP: 0018:ffff8880ba407b98 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88805505a080 R12: 0000000000000018
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8bebbd40
FS:  000000000191a400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001923848 CR3: 0000000055043000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/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+0x108/0x390 net/ipv6/route.c:402
 dst_destroy+0xc0/0x390 net/core/dst.c:129
 __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+0x780/0x1180 kernel/rcu/tree.c:2946
 __do_softirq+0x24d/0x9ff kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x50 kernel/kcov.c:68
RSP: 0018:ffff888055067a68 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffff88805505a080 RBX: ffffffff893d16e0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87cce9c0 RDI: ffffffff87ccea00
RBP: ffffffff87ccea00 R08: ffffffff8b9c1858 R09: 0000000000000000
R10: ffff888055067cf0 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff87cce9c0 R14: ffff8880a95be820 R15: ffff88808e6272c0
 check_preemption_disabled+0x15/0x240 lib/smp_processor_id.c:14
 rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1186 [inline]
 rcu_lockdep_current_cpu_online+0x35/0x140 kernel/rcu/tree.c:1177
 rcu_read_lock_sched_held+0xd3/0x1d0 kernel/rcu/update.c:113
 rcu_sync_lockdep_assert+0x69/0xa0 kernel/rcu/sync.c:68
 rcu_sync_is_idle include/linux/rcu_sync.h:56 [inline]
 percpu_down_read_trylock include/linux/percpu-rwsem.h:72 [inline]
 __sb_start_write+0x14f/0x260 fs/super.c:1340
 sb_start_write_trylock include/linux/fs.h:1554 [inline]
 touch_atime+0x123/0x250 fs/inode.c:1731
 get_link fs/namei.c:1072 [inline]
 trailing_symlink+0x26a/0x750 fs/namei.c:2283
 path_mountpoint+0x6cb/0x940 fs/namei.c:2720
 filename_mountpoint+0x162/0x490 fs/namei.c:2745
 SYSC_umount fs/namespace.c:1730 [inline]
 SyS_umount+0x125/0xeb0 fs/namespace.c:1714
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x467a57
RSP: 002b:00007fff1445ebc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00000000000004ab RCX: 0000000000467a57
RDX: 00007fff1445eca0 RSI: 0000000000000002 RDI: 00007fff1445ec90
RBP: 00007fff1445ec90 R08: 00000000ffffffff R09: 00007fff1445ea60
R10: 000000000191b853 R11: 0000000000000246 R12: 00000000004bee98
R13: 00007fff1445fd60 R14: 000000000191b810 R15: 00007fff1445fda0
Code: 18 00 00 00 00 48 81 c4 80 01 00 00 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 67 2a 00 00 49 81 3c 24 a0 77 2e 8b 0f 84 5f 
RIP: __lock_acquire+0x1cc/0x3f20 kernel/locking/lockdep.c:3369 RSP: ffff8880ba407b98
---[ end trace 34c74e2099625a5d ]---