bisecting fixing commit since 84f5ad468100f86d70096799e4ee716a17c2962f
building syzkaller on ddc3e85997efdad885e208db6a98bca86e5dd52f
testing commit 84f5ad468100f86d70096799e4ee716a17c2962f with gcc (GCC) 8.1.0
kernel signature: 778af8897045bf942a9fbe52f262598814d8595317eeede70e8183f379f4abd1
all runs: crashed: general protection fault in hsr_check_carrier_and_operstate
testing current HEAD e0f8b8a65a473a8baa439cf865a694bbeb83fe90
testing commit e0f8b8a65a473a8baa439cf865a694bbeb83fe90 with gcc (GCC) 8.1.0
kernel signature: e5edf99ece2d84657f03bebb6dd707ebf032ed5c48a60f91e1c6bd220c455520
all runs: crashed: general protection fault in hsr_check_carrier_and_operstate
revisions tested: 2, total time: 25m22.669684509s (build: 17m32.366477069s, test: 7m12.315477743s)
the crash still happens on HEAD
commit msg: Linux 4.14.170
crash: general protection fault in hsr_check_carrier_and_operstate
device bridge7 entered promiscuous mode
device ipvlan1 left promiscuous mode
device bridge18 left 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: 7949 Comm: syz-executor.2 Not tainted 4.14.170-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88808a35a5c0 task.stack: ffff8880949e8000
RIP: 0010:hsr_check_carrier_and_operstate+0x33/0x580 net/hsr/hsr_device.c:116
RSP: 0018:ffff8880949eedb0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880783a8b00 RCX: 1ffff1100f075174
RDX: 0000000000000002 RSI: 0000000000000004 RDI: ffff8880783a8b20
RBP: ffff8880949eede0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000028 R11: ffff88808a35a5c0 R12: 0000000000000000
R13: 0000000000000004 R14: 0000000000000010 R15: ffff88808d64d800
FS:  00007f29d975d700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f95003db8 CR3: 00000000a9ffe000 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:1671
 netdev_state_change+0xb5/0xe0 net/core/dev.c:1318
 do_setlink+0x197f/0x2c50 net/core/rtnetlink.c:2280
 rtnl_newlink+0xe0c/0x1390 net/core/rtnetlink.c:2660
 rtnetlink_rcv_msg+0x34c/0x9e0 net/core/rtnetlink.c:4315
 netlink_rcv_skb+0x133/0x370 net/netlink/af_netlink.c:2432
 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4327
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x40b/0x600 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x730/0xbd0 net/netlink/af_netlink.c:1877
 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+0x42/0xb7
RIP: 0033:0x45af49
RSP: 002b:00007f29d975cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f29d975d6d4
R13: 00000000004ca9a0 R14: 00000000004e3d80 R15: 00000000ffffffff
Code: e5 41 57 41 56 41 55 41 54 53 48 83 ec 08 e8 25 a7 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: ffff8880949eedb0
---[ end trace 731697ba3c274d9f ]---