bisecting fixing commit since 189522da8b3a796d56d802e067d591d2ffff7f40
building syzkaller on 2e44d63e401ead7d7928c95a30d243b2de1a243b
testing commit 189522da8b3a796d56d802e067d591d2ffff7f40 with gcc (GCC) 8.1.0
kernel signature: cbadab3ab9c99ea620772d62024fa0eeb5247505372abcee675166d0a0c1b24b
all runs: crashed: WARNING in ip_rt_bug
testing current HEAD 6ba1b005ffc388c2aeaddae20da29e4810dea298
testing commit 6ba1b005ffc388c2aeaddae20da29e4810dea298 with gcc (GCC) 8.1.0
kernel signature: 1a9efaf6a56ccf1b0336323e8747c346446f5c890ecacbe5f18ccb2b1fc1ad68
all runs: crashed: WARNING in ip_rt_bug
revisions tested: 2, total time: 17m23.715311183s (build: 10m36.407138019s, test: 6m14.105534953s)
the crash still happens on HEAD
commit msg: Merge tag 'asm-generic-fixes-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic into master
crash: WARNING in ip_rt_bug
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8618 at net/ipv4/route.c:1241 ip_rt_bug+0x8/0x10 net/ipv4/route.c:1240
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8618 Comm: syz-executor.0 Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xb3/0xec lib/dump_stack.c:118
 panic+0x115/0x2fa kernel/panic.c:231
 __warn.cold.13+0x20/0x25 kernel/panic.c:600
 report_bug+0xc0/0xf0 lib/bug.c:198
 handle_bug+0x35/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x60 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540
RIP: 0010:ip_rt_bug+0x8/0x10 net/ipv4/route.c:1241
Code: 48 48 8b 53 50 48 85 d2 74 04 f0 ff 42 08 48 89 50 50 5b 41 5c 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00 48 89 d7 e8 a8 f2 de ff <0f> 0b 31 c0 c3 0f 1f 00 48 8b 77 18 48 89 fa 48 c7 c7 c0 71 51 84
RSP: 0018:ffffc90002cc79f8 EFLAGS: 00010282
RAX: 0000000000000001 RBX: ffff888117704180 RCX: 0000000000000000
RDX: 0000000000000402 RSI: ffffffff842e04c0 RDI: 0000000000000286
RBP: ffffc90002cc7b60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000000c
R13: 0000000000000000 R14: ffff8881210af82c R15: ffffc90002cc7a80
 ip_send_skb+0x10/0x40 net/ipv4/ip_output.c:1560
 __icmp_send+0x45f/0x780 net/ipv4/icmp.c:740
 icmp_send include/net/icmp.h:43 [inline]
 ip_options_compile+0x5c/0x70 net/ipv4/ip_options.c:486
 ip_rcv_options net/ipv4/ip_input.c:278 [inline]
 ip_rcv_finish_core.isra.22+0x19e/0x650 net/ipv4/ip_input.c:370
 ip_rcv_finish+0x5c/0xb0 net/ipv4/ip_input.c:426
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip_rcv+0x58/0x200 net/ipv4/ip_input.c:539
 __netif_receive_skb_one_core+0x53/0x70 net/core/dev.c:5281
 netif_receive_skb_internal net/core/dev.c:5497 [inline]
 netif_receive_skb+0x90/0x390 net/core/dev.c:5556
 tun_rx_batched.isra.53+0x18a/0x1f0 drivers/net/tun.c:1518
 tun_get_user+0x1030/0x1580 drivers/net/tun.c:1972
 tun_chr_write_iter+0x46/0x67 drivers/net/tun.c:2001
 call_write_iter include/linux/fs.h:1908 [inline]
 new_sync_write+0x113/0x1a0 fs/read_write.c:503
 vfs_write+0x1eb/0x220 fs/read_write.c:578
 ksys_write+0x5a/0xd0 fs/read_write.c:631
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c8a9
Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff131ebbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000050cf00 RCX: 000000000045c8a9
RDX: 000000000000100c RSI: 0000000020000240 RDI: 0000000000000005
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000d0f R14: 00000000004cf47f R15: 00007ff131ebc6d4
Kernel Offset: disabled
Rebooting in 86400 seconds..