bisecting fixing commit since 84f5ad468100f86d70096799e4ee716a17c2962f
building syzkaller on ddc3e85997efdad885e208db6a98bca86e5dd52f
testing commit 84f5ad468100f86d70096799e4ee716a17c2962f with gcc (GCC) 8.1.0
kernel signature: 3d592295da08952c26ea0372d53854f040048ebbd7abf9b7ef37d6049a7a907b
run #0: OK
run #1: OK
run #2: crashed: general protection fault in hsr_check_carrier_and_operstate
run #3: OK
run #4: OK
run #5: crashed: general protection fault in hsr_check_carrier_and_operstate
run #6: OK
run #7: OK
run #8: OK
run #9: crashed: general protection fault in hsr_check_carrier_and_operstate
testing current HEAD 5b7a52cd2eef952cee8a72512ef370bcdef46636
testing commit 5b7a52cd2eef952cee8a72512ef370bcdef46636 with gcc (GCC) 8.1.0
kernel signature: 7bb80e309095f5ad5d6900113ea0c7f9dd11785e6a4d608ee614c764aacba77c
run #0: OK
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: crashed: general protection fault in hsr_check_carrier_and_operstate
run #8: crashed: general protection fault in hsr_check_carrier_and_operstate
run #9: crashed: general protection fault in hsr_check_carrier_and_operstate
revisions tested: 2, total time: 36m56.444143162s (build: 15m54.145465382s, test: 20m8.996267596s)
the crash still happens on HEAD
commit msg: Linux 4.14.202
crash: general protection fault in hsr_check_carrier_and_operstate
device bridge29 entered promiscuous mode
device bridge31 entered promiscuous mode
device bridge30 entered promiscuous mode
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: 19954 Comm: syz-executor045 Not tainted 4.14.202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888046c2e200 task.stack: ffff88803e940000
RIP: 0010:hsr_check_carrier_and_operstate+0x33/0x580 net/hsr/hsr_device.c:116
RSP: 0018:ffff88803e946db0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88807f5f5c00 RCX: 1ffff1100f17fb04
RDX: 0000000000000002 RSI: 0000000000000004 RDI: ffff88807f5f5c20
RBP: ffff88803e946de0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000028 R11: ffff888046c2e200 R12: 0000000000000000
R13: 0000000000000004 R14: 0000000000000010 R15: ffff888080eff880
FS:  00007f638d58a700(0000) GS:ffff8880ba800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005580a684e5d8 CR3: 00000000a8bd4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 hsr_netdev_notify+0x535/0x9b0 net/hsr/hsr_main.c:51
 notifier_call_chain+0xd6/0x150 kernel/notifier.c:93
 __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401
 call_netdevice_notifiers_info+0x4b/0x60 net/core/dev.c:1667
 netdev_state_change+0xb5/0xe0 net/core/dev.c:1314
 do_setlink+0x197f/0x2c50 net/core/rtnetlink.c:2280
 rtnl_newlink+0xe5a/0x13a0 net/core/rtnetlink.c:2660
 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+0x730/0xbd0 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: 0033:0x446df9
RSP: 002b:00007f638d589db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000006dbc78 RCX: 0000000000446df9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000008
RBP: 00000000006dbc70 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00000000006dbc7c
R13: 00007fff19670e8f R14: 00007f638d58a9c0 R15: 20c49ba5e353f7cf
Code: e5 41 57 41 56 41 55 41 54 53 48 83 ec 08 e8 a5 a6 ff ff 4c 8d 70 10 49 89 c4 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 c3 04 00 00 48 b8 00 00 00 00 00 fc ff df 49 
RIP: hsr_check_carrier_and_operstate+0x33/0x580 net/hsr/hsr_device.c:116 RSP: ffff88803e946db0
---[ end trace 1c84e6c78211cfb8 ]---