bisecting fixing commit since cd02217a5d813e2bbec984a9eeb8280ff290a150
building syzkaller on 6436ce4bcd8e2c7dcca0b171ac91f51e96d973f8
testing commit cd02217a5d813e2bbec984a9eeb8280ff290a150 with gcc (GCC) 8.4.1 20210217
kernel signature: a7a58c3277dc1a57cf8469e86502eb7981a3d6e984ef01147a4ff50804609d1d
all runs: crashed: WARNING in rtnl_delete_link
testing current HEAD 7a7fd0de4a9804299793e564a555a49c1fc924cb
testing commit 7a7fd0de4a9804299793e564a555a49c1fc924cb with gcc (GCC) 10.2.1 20210217
kernel signature: 45e4eb5c85ebda86d6691aed82c061cf06f91de2fc33781abefb8f0bab87ee8c
all runs: crashed: WARNING in rtnl_dellink
revisions tested: 2, total time: 20m30.578179991s (build: 12m12.849503247s, test: 7m29.632536502s)
the crash still happens on HEAD
commit msg: Merge branch 'kmap-conversion-for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
crash: WARNING in rtnl_dellink
bond4 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8646 at net/core/dev.c:10928 netdev_has_any_lower_dev net/core/dev.c:7208 [inline]
WARNING: CPU: 1 PID: 8646 at net/core/dev.c:10928 unregister_netdevice_many+0xff4/0x1520 net/core/dev.c:10929
Modules linked in:
CPU: 1 PID: 8646 Comm: syz-executor.1 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unregister_netdevice_many+0xff4/0x1520 net/core/dev.c:10928
Code: 09 fb ff ff ba 28 1c 00 00 48 c7 c6 60 90 78 88 48 c7 c7 a0 90 78 88 c6 05 ec 3b 8d 04 01 e8 c0 af 96 01 0f 0b e9 e3 fa ff ff <0f> 0b e9 cf fa ff ff 48 89 ef e9 59 fa ff ff 4c 89 04 24 e8 24 de
RSP: 0018:ffffc9000808f308 EFLAGS: 00010202
RAX: ffff8881030e9d01 RBX: ffffffff883e7ba0 RCX: ffffffff8152592e
RDX: 1ffff1102029b814 RSI: 0000000000000008 RDI: ffffffff8a0f0b80
RBP: ffff888116580500 R08: 0000000000000000 R09: ffffffff8a0f0b87
R10: fffffbfff141e170 R11: 0000000000000001 R12: 0000000000000003
R13: ffff888116580500 R14: dffffc0000000000 R15: ffff8881014dc000
FS:  00007f4f66ab5700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4f66a52718 CR3: 000000011bcd9003 CR4: 00000000001706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rtnl_delete_link net/core/rtnetlink.c:3057 [inline]
 rtnl_dellink+0x2c5/0x990 net/core/rtnetlink.c:3109
 rtnetlink_rcv_msg+0x32f/0x860 net/core/rtnetlink.c:5553
 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2502
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:674
 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2350
 ___sys_sendmsg+0xd3/0x150 net/socket.c:2404
 __sys_sendmsg+0xb2/0x140 net/socket.c:2433
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465029
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4f66ab5188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000055d0e0 RCX: 0000000000465029
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000009
RBP: 00000000004af6d2 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055d0e0
R13: 0000000000a8fb5f R14: 00007f4f66ab5300 R15: 0000000000022000