bisecting fixing commit since b0cdffaa546e24acf92ab3b0d4e917a51aff6a82
building syzkaller on 4c04afaa19a16e90d8b495cc3795fd4ed21df4df
testing commit b0cdffaa546e24acf92ab3b0d4e917a51aff6a82 with gcc (GCC) 8.4.1 20210217
kernel signature: d8efdfb55841f89c458cd6275772f131ec97a505403d3b189c837cd0381e64bd
all runs: crashed: general protection fault in ipt_init_target
testing current HEAD 7d7d1c0ab3eb7c8d8f63a126535018007823b207
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217
kernel signature: 245f26cee61705bf5e00e76fd606cabf99efa78b49a6e3007eab05b0801886c7
all runs: crashed: general protection fault in ipt_init_target
revisions tested: 2, total time: 25m59.548234466s (build: 17m57.954471641s, test: 6m20.184851038s)
the crash still happens on HEAD
commit msg: Linux 4.14.232
crash: general protection fault in ipt_init_target
IPv6: ADDRCONF(NETDEV_UP): veth1_virt_wifi: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device bond0
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: 6812 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: ffff8881de6a8600 task.stack: ffff8881dea30000
RIP: 0010:ipt_init_target+0xa6/0x2c0 net/sched/act_ipt.c:46
RSP: 0018:ffff8881dea37010 EFLAGS: 00010207
RAX: 0000000000000005 RBX: 1ffff1103bd46e07 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000010 RDI: 000000000000002f
RBP: ffff8881dea37180 R08: ffffed103ec391d1 R09: ffffed103ec391d0
R10: ffffed103ec391d0 R11: ffff8881f61c8e86 R12: ffff8881dea370b8
R13: 0000000000000010 R14: ffff8881dea37158 R15: ffff8881d19e0080
FS:  00007f3ccaff5700(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcaa377fe8 CR3: 00000001de816004 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __tcf_ipt_init+0x41b/0xa30 net/sched/act_ipt.c:168
 tcf_xt_init+0x23/0x30 net/sched/act_ipt.c:210
 tcf_action_init_1+0x51a/0xb00 net/sched/act_api.c:682
 tcf_action_init+0x13b/0x460 net/sched/act_api.c:751
 tcf_action_add net/sched/act_api.c:1079 [inline]
 tc_ctl_action+0x3c4/0x580 net/sched/act_api.c:1131
 rtnetlink_rcv_msg+0x34c/0x9e0 net/core/rtnetlink.c:4316
 netlink_rcv_skb+0x12f/0x3b0 net/netlink/af_netlink.c:2433
 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4328
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x40b/0x600 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x72f/0xbf0 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0xf0 net/socket.c:656
 ___sys_sendmsg+0x625/0x920 net/socket.c:2062
 __sys_sendmsg+0xc1/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0xd/0x20 net/socket.c:2103
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x462829
RSP: 002b:00007f3ccaff51a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 0000000000462829
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004fc5f8 R14: 00000000004b5f1b R15: 00007f3ccaff56bc
Code: 40 08 00 00 f2 f2 c7 40 0c f2 f2 f2 f2 c7 40 1c 00 00 f2 f2 c7 40 20 f3 f3 f3 f3 31 c0 f3 48 ab 48 8d 7e 1f 48 89 f8 48 c1 e8 03 <0f> b6 04 10 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 8c 01 00 
RIP: ipt_init_target+0xa6/0x2c0 net/sched/act_ipt.c:46 RSP: ffff8881dea37010
---[ end trace 4b44681d19458d30 ]---