bisecting fixing commit since 990f227371a400c0fbcb98b75c91a7dbd65f6132
building syzkaller on 54ce1ed6b9fcb3b8d77c43dd4b3533e70cade414
testing commit 990f227371a400c0fbcb98b75c91a7dbd65f6132 with gcc (GCC) 8.1.0
kernel signature: 501fb168e9ff5dde37e5e22094069d428db4879d94c65f37f98d85f168d0e23e
all runs: crashed: WARNING in dev_change_net_namespace
testing current HEAD e37b12e4bb21e7c81732370b0a2b34bd196f380b
testing commit e37b12e4bb21e7c81732370b0a2b34bd196f380b with gcc (GCC) 8.1.0
kernel signature: 7ca156d5df237bf17822e1cded1c2aa2349056d280202fe9062693e5cb973c1d
all runs: crashed: WARNING in dev_change_net_namespace
revisions tested: 2, total time: 16m27.306960047s (build: 9m34.058964486s, test: 6m17.675160562s)
the crash still happens on HEAD
commit msg: Merge tag 'for-linus-5.11-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
crash: WARNING in dev_change_net_namespace
RAX: ffffffffffffffda RBX: 000000000002c0c0 RCX: 000000000045d249
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00007f36c110aca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00007fffa9b6681f R14: 00007f36c110b9c0 R15: 000000000118cf4c
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8666 at net/core/dev.c:10852 netdev_adjacent_del_links net/core/dev.c:8163 [inline]
WARNING: CPU: 0 PID: 8666 at net/core/dev.c:10852 dev_change_net_namespace+0x458/0x480 net/core/dev.c:10837
Modules linked in:
CPU: 0 PID: 8666 Comm: syz-executor.2 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:dev_change_net_namespace+0x458/0x480 net/core/dev.c:10852
Code: 48 c7 c6 67 a2 0c 84 48 c7 c7 20 4a ed 83 c6 05 5d bc 0b 02 01 e8 6a 68 80 00 0f 0b e9 f1 fb ff ff 4c 8b 24 24 e9 e5 fd ff ff <0f> 0b e9 01 ff ff ff 0f 0b e9 12 ff ff ff b8 ea ff ff ff e9 4b ff
RSP: 0018:ffffc90004847580 EFLAGS: 00010282
RAX: 00000000fffffff4 RBX: ffff888116565000 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff83f4024b RDI: 0000000000000282
RBP: ffff8881165650a0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: ffffc900048470d8 R12: ffff8881165650b8
R13: ffffffff84826200 R14: ffff888116565090 R15: ffffffff84826200
FS:  00007f36c110b700(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001590004 CR3: 0000000116d96002 CR4: 00000000001706f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_setlink+0xd5/0x10c0 net/core/rtnetlink.c:2613
 __rtnl_newlink+0x538/0x8b0 net/core/rtnetlink.c:3376
 rtnl_newlink+0x3e/0x60 net/core/rtnetlink.c:3502
 rtnetlink_rcv_msg+0x173/0x480 net/core/rtnetlink.c:5564
 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x248/0x480 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x2b/0x40 net/socket.c:672
 ____sys_sendmsg+0x1ed/0x230 net/socket.c:2345
 ___sys_sendmsg+0x77/0xb0 net/socket.c:2399
 __sys_sendmsg+0x52/0xa0 net/socket.c:2432
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d249
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f36c110ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002c0c0 RCX: 000000000045d249
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00007f36c110aca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00007fffa9b6681f R14: 00007f36c110b9c0 R15: 000000000118cf4c