audit: type=1804 audit(1547055434.620:122): pid=26734 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor0" name="/root/syzkaller-testdir578256746/syzkaller.6IaO83/297/memory.events" dev="sda1" ino=16781 res=1
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kernel BUG at net/ipv6/route.c:1260!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 26781 Comm: syz-executor5 Not tainted 4.20.0+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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RIP: 0010:rt6_make_pcpu_route net/ipv6/route.c:1260 [inline]
RIP: 0010:ip6_pol_route+0x82f/0x1490 net/ipv6/route.c:1893
downgrading a read lock
WARNING: CPU: 1 PID: 26773 at kernel/locking/lockdep.c:3553 __lock_downgrade kernel/locking/lockdep.c:3553 [inline]
WARNING: CPU: 1 PID: 26773 at kernel/locking/lockdep.c:3553 lock_downgrade+0x4d2/0x910 kernel/locking/lockdep.c:3816
Code: 48 03 1c c5 60 70 55 89 be 08 00 00 00 48 89 df e8 66 de f1 fa 31 c0 f0 4c 0f b1 3b 48 85 c0 0f 84 b3 fb ff ff e8 d1 c0 ae fa <0f> 0b e8 ca c0 ae fa e8 c5 8b 99 fa 31 ff 89 c6 88 85 c8 fe ff ff
Kernel panic - not syncing: panic_on_warn set ...
RSP: 0018:ffff88806592edd0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffffe8ffffc67cb8 RCX: ffffc900060d5000
RDX: 000000000000098b RSI: ffffffff86d2e53f RDI: ffffe8ffffc67cb8
RBP: ffff88806592ef18 R08: 1ffffd1ffff8cf97 R09: fffff91ffff8cf98
R10: fffff91ffff8cf97 R11: ffffe8ffffc67cbf R12: ffff8880857463c0
R13: 0000000000000001 R14: ffff88806592eef0 R15: ffff88808a02c840
FS:  00007f93f8843700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004db3f8 CR3: 000000009282f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ip6_pol_route_input+0x65/0x80 net/ipv6/route.c:1909
 fib6_rule_lookup+0x12f/0x870 net/ipv6/fib6_rules.c:118
 ip6_route_input_lookup+0xb7/0xd0 net/ipv6/route.c:1921
 ip6_route_input+0x79b/0xe00 net/ipv6/route.c:2056
 ip6_rcv_finish_core.isra.0+0x204/0x720 net/ipv6/ip6_input.c:63
 ip6_rcv_finish+0x109/0x330 net/ipv6/ip6_input.c:74
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ipv6_rcv+0x113/0x650 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core+0x160/0x210 net/core/dev.c:4973
 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
 netif_receive_skb_internal+0x11e/0x690 net/core/dev.c:5186
 napi_frags_finish net/core/dev.c:5753 [inline]
 napi_gro_frags+0xd07/0xfe0 net/core/dev.c:5827
 tun_get_user+0x2ec2/0x4150 drivers/net/tun.c:1972
 tun_chr_write_iter+0xbd/0x160 drivers/net/tun.c:2017
 call_write_iter include/linux/fs.h:1857 [inline]
 do_iter_readv_writev+0x856/0xae0 fs/read_write.c:680
 do_iter_write fs/read_write.c:959 [inline]
 do_iter_write+0x184/0x600 fs/read_write.c:940
 vfs_writev+0x1ee/0x370 fs/read_write.c:1004
 do_writev+0x11a/0x300 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457d81
Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 b8 fb ff c3 48 83 ec 08 e8 1a 2d 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 63 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f93f8842ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000046 RCX: 0000000000457d81
RDX: 0000000000000001 RSI: 00007f93f8842bf0 RDI: 00000000000000f0
RBP: 0000000020000180 R08: 00000000000000f0 R09: 0000000000000000
R10: 00007f93f88439d0 R11: 0000000000000293 R12: 00007f93f88436d4
R13: 00000000004c636f R14: 00000000004db3f8 R15: 00000000ffffffff
Modules linked in:
Kernel Offset: disabled
Rebooting in 86400 seconds..