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kernel BUG at net/ipv4/ip_output.c:776!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
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CPU: 1 PID: 24646 Comm: syz-executor4 Not tainted 4.20.0-rc6+ #107
downgrading a read lock
WARNING: CPU: 0 PID: 24653 at kernel/locking/lockdep.c:3556 __lock_downgrade kernel/locking/lockdep.c:3556 [inline]
WARNING: CPU: 0 PID: 24653 at kernel/locking/lockdep.c:3556 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3819
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Kernel panic - not syncing: panic_on_warn set ...
RIP: 0010:ip_do_fragment+0x2447/0x2ad0 net/ipv4/ip_output.c:776
Code: ff 48 89 cf e8 ba 4a 33 fb e9 dc ea ff ff 48 89 df e8 ed 4a 33 fb e9 02 e7 ff ff e8 43 4b 33 fb e9 97 e6 ff ff e8 f9 e4 ef fa <0f> 0b 4c 89 f7 e8 8f 4a 33 fb e9 2f e6 ff ff 4c 89 e7 e8 82 4a 33
RSP: 0018:ffff888196dde618 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff8881ceaae700 RCX: ffffc9000de4d000
RDX: 000000000002c93b RSI: ffffffff868f3037 RDI: 0000000000000005
RBP: ffff888196dde7f0 R08: ffff88819119e440 R09: ffffed1032548e90
R10: ffffed1032548e92 R11: ffff888192a47493 R12: ffff8881ceaae7c4
R13: 00000000fffffff2 R14: ffff8881ceaae7d0 R15: dffffc0000000000
FS:  00007efc33a90700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001bd750000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ip_fragment.constprop.50+0x179/0x240 net/ipv4/ip_output.c:549
 ip_finish_output+0x6b4/0xfa0 net/ipv4/ip_output.c:315
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_mc_output+0x2c4/0x15b0 net/ipv4/ip_output.c:390
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x63b/0x9c0 net/ipv4/ip_tunnel_core.c:91
 ip_tunnel_xmit+0x15b8/0x3c04 net/ipv4/ip_tunnel.c:787
 __gre_xmit+0x5e1/0x980 net/ipv4/ip_gre.c:451
 ipgre_xmit+0x3e7/0xba0 net/ipv4/ip_gre.c:705
 __netdev_start_xmit include/linux/netdevice.h:4356 [inline]
 netdev_start_xmit include/linux/netdevice.h:4365 [inline]
 xmit_one net/core/dev.c:3257 [inline]
 dev_hard_start_xmit+0x295/0xc80 net/core/dev.c:3273
 __dev_queue_xmit+0x2f71/0x3ad0 net/core/dev.c:3843
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3876
 __bpf_tx_skb net/core/filter.c:2017 [inline]
 __bpf_redirect_common net/core/filter.c:2055 [inline]
 __bpf_redirect+0x5cf/0xb20 net/core/filter.c:2062
 ____bpf_clone_redirect net/core/filter.c:2095 [inline]
 bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2067
 bpf_prog_bebbfe2050753572+0x993/0x1000
Modules linked in:
Kernel Offset: disabled
Rebooting in 86400 seconds..