bisecting fixing commit since 189522da8b3a796d56d802e067d591d2ffff7f40
building syzkaller on 2e44d63e401ead7d7928c95a30d243b2de1a243b
testing commit 189522da8b3a796d56d802e067d591d2ffff7f40 with gcc (GCC) 8.1.0
kernel signature: 1f9da64a6efd72a9c4d4759f2f20ed9216900fefee150bb320251df3e37f3651
all runs: crashed: WARNING in ip_rt_bug
testing current HEAD 659caaf65dc9c7150aa3e80225ec6e66b25ab3ce
testing commit 659caaf65dc9c7150aa3e80225ec6e66b25ab3ce with gcc (GCC) 8.1.0
kernel signature: 4a4284e9d9c15bf5211d6281029937690bffad4031cbdd0f29c7284709b23aa1
all runs: crashed: WARNING in ip_rt_bug
revisions tested: 2, total time: 16m50.02353986s (build: 10m20.71049979s, test: 5m52.513133494s)
the crash still happens on HEAD
commit msg: Merge tag 'ceph-for-5.10-rc3' of git://github.com/ceph/ceph-client
crash: WARNING in ip_rt_bug
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8382 at net/ipv4/route.c:1252 ip_rt_bug+0x8/0x10 net/ipv4/route.c:1251
Modules linked in:
CPU: 1 PID: 8382 Comm: syz-executor.2 Not tainted 5.10.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ip_rt_bug+0x8/0x10 net/ipv4/route.c:1252
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 28 5e de ff <0f> 0b 31 c0 c3 0f 1f 00 48 8b 77 18 48 89 fa 48 c7 c7 40 36 62 84
RSP: 0018:ffffc90002f3fa08 EFLAGS: 00010282
RAX: 0000000000000001 RBX: ffff88810c5b2180 RCX: 0000000000000000
RDX: 0000000000000402 RSI: ffffffff83e89fd7 RDI: 0000000000000282
RBP: ffffc90002f3fb70 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 000000000000fffc R12: 000000000000000c
R13: 0000000000000000 R14: ffff88810bb9f02c R15: ffffc90002f3fa90
FS:  00007fcf253ec700(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004ef410 CR3: 00000001227ef000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ip_send_skb+0x10/0x40 net/ipv4/ip_output.c:1568
 __icmp_send+0x45f/0x780 net/ipv4/icmp.c:762
 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:301 [inline]
 ip_rcv+0x58/0x200 net/ipv4/ip_input.c:539
 __netif_receive_skb_one_core+0x53/0x70 net/core/dev.c:5315
 netif_receive_skb_internal net/core/dev.c:5534 [inline]
 netif_receive_skb+0x8e/0x370 net/core/dev.c:5593
 tun_rx_batched.isra.56+0x18a/0x1f0 drivers/net/tun.c:1485
 tun_get_user+0x102f/0x1580 drivers/net/tun.c:1939
 tun_chr_write_iter+0x46/0x70 drivers/net/tun.c:1968
 call_write_iter include/linux/fs.h:1887 [inline]
 new_sync_write+0x117/0x1a0 fs/read_write.c:518
 vfs_write+0x195/0x230 fs/read_write.c:605
 ksys_write+0x5a/0xd0 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 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:00007fcf253ebc78 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: 00007fcf253ec6d4