bisecting fixing commit since 990f227371a400c0fbcb98b75c91a7dbd65f6132
building syzkaller on 54ce1ed6b9fcb3b8d77c43dd4b3533e70cade414
testing commit 990f227371a400c0fbcb98b75c91a7dbd65f6132 with gcc (GCC) 8.1.0
kernel signature: e7826ab3705c3428c4a306d6952b6fdec966f2195ee04cdb0120458af2b14295
all runs: crashed: WARNING in dev_change_net_namespace
testing current HEAD 856deb866d16e29bd65952e0289066f6078af773
testing commit 856deb866d16e29bd65952e0289066f6078af773 with gcc (GCC) 8.1.0
kernel signature: 5ca62b038008af38c285047f0cea3cb319e646c68e8e98876d9e49e5f4fad3c8
all runs: crashed: WARNING in dev_change_net_namespace
revisions tested: 2, total time: 16m38.756829883s (build: 9m32.951903071s, test: 6m35.453631591s)
the crash still happens on HEAD
commit msg: Linux 5.9-rc5
crash: WARNING in dev_change_net_namespace
RAX: ffffffffffffffda RBX: 000000000002c0c0 RCX: 000000000045d249
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00007fd4a50fcca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00007ffcd5fdeaff R14: 00007fd4a50fd9c0 R15: 000000000118d08c
------------[ cut here ]------------
WARNING: CPU: 1 PID: 9415 at net/core/dev.c:10562 netdev_adjacent_del_links net/core/dev.c:7970 [inline]
WARNING: CPU: 1 PID: 9415 at net/core/dev.c:10562 dev_change_net_namespace+0x458/0x480 net/core/dev.c:10547
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 9415 Comm: syz-executor.1 Not tainted 5.9.0-rc5-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+0xa3/0xcc lib/dump_stack.c:118
 panic+0x135/0x31a kernel/panic.c:231
 __warn.cold.13+0x20/0x25 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:10562
Code: 48 c7 c6 07 f5 05 84 48 c7 c7 e0 08 e7 83 c6 05 45 99 d6 01 01 e8 43 ed 94 fe 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:ffffc9000494f598 EFLAGS: 00010282
RAX: 00000000fffffff4 RBX: ffff88810e54c000 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff83edad73 RDI: 0000000000000282
RBP: ffff88810e54c0a0 R08: 0000000000000001 R09: 0000000000000001
R10: ffff88810ee8e240 R11: 7560a90b5fe5ca3a R12: ffff88810e54c0b8
R13: ffffffff8452f980 R14: ffff88810e54c090 R15: ffffffff8452f980
 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:00007fd4a50fcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002c0c0 RCX: 000000000045d249
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00007fd4a50fcca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00007ffcd5fdeaff R14: 00007fd4a50fd9c0 R15: 000000000118d08c
Kernel Offset: disabled
Rebooting in 86400 seconds..