bisecting fixing commit since 990f227371a400c0fbcb98b75c91a7dbd65f6132
building syzkaller on 54ce1ed6b9fcb3b8d77c43dd4b3533e70cade414
testing commit 990f227371a400c0fbcb98b75c91a7dbd65f6132 with gcc (GCC) 8.1.0
kernel signature: dacdf968e483f033bdbfc4050a9ce22dbb55ba1cdd1c4d984749722cb4b3fcbf
all runs: crashed: WARNING in dev_change_net_namespace
testing current HEAD b5fc7a89e58bcc059a3d5e4db79c481fb437de59
testing commit b5fc7a89e58bcc059a3d5e4db79c481fb437de59 with gcc (GCC) 8.1.0
kernel signature: e49362afc973b0f48d8f266d42cce349988fb5e2a41484a26661b8e3c4320bc5
all runs: crashed: WARNING in dev_change_net_namespace
revisions tested: 2, total time: 16m53.583294914s (build: 9m55.978159774s, test: 6m31.582379235s)
the crash still happens on HEAD
commit msg: Merge tag 'overflow-v5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
crash: WARNING in dev_change_net_namespace
RBP: 00007f06e3614ca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00007ffff2d042ef R14: 00007f06e36159c0 R15: 000000000118d08c
------------[ cut here ]------------
WARNING: CPU: 0 PID: 9618 at net/core/dev.c:10642 netdev_adjacent_del_links net/core/dev.c:8033 [inline]
WARNING: CPU: 0 PID: 9618 at net/core/dev.c:10642 dev_change_net_namespace+0x458/0x480 net/core/dev.c:10627
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9618 Comm: syz-executor.5 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xa3/0xc8 lib/dump_stack.c:118
 panic+0x135/0x31a kernel/panic.c:231
 __warn.cold.13+0x20/0x20 kernel/panic.c:600
 report_bug+0xc0/0xf0 lib/bug.c:198
 handle_bug+0x35/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x13/0x60 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:dev_change_net_namespace+0x458/0x480 net/core/dev.c:10642
Code: 48 c7 c6 87 cd 09 84 48 c7 c7 20 da ea 83 c6 05 28 dd f0 01 01 e8 5d 38 7c 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:ffffc9000533f598 EFLAGS: 00010282
RAX: 00000000fffffff4 RBX: ffff88810e7d7000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83e75967 RDI: 0000000000000282
RBP: ffff88810e7d70a0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: ffffc9000533f150 R12: ffff88810e7d70b8
R13: ffffffff8461b6c0 R14: ffff88810e7d7090 R15: ffffffff8461b6c0
 do_setlink+0xd5/0x10b0 net/core/rtnetlink.c:2611
 __rtnl_newlink+0x538/0x8a0 net/core/rtnetlink.c:3374
 rtnl_newlink+0x3e/0x60 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x173/0x480 net/core/rtnetlink.c:5563
 netlink_rcv_skb+0x41/0x110 net/netlink/af_netlink.c:2470
 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:651 [inline]
 sock_sendmsg+0x2b/0x40 net/socket.c:671
 ____sys_sendmsg+0x1ed/0x230 net/socket.c:2353
 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407
 __sys_sendmsg+0x52/0xa0 net/socket.c:2440
 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:00007f06e3614c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002c0c0 RCX: 000000000045d249
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00007f06e3614ca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00007ffff2d042ef R14: 00007f06e36159c0 R15: 000000000118d08c
Kernel Offset: disabled
Rebooting in 86400 seconds..