bisecting fixing commit since 990f227371a400c0fbcb98b75c91a7dbd65f6132
building syzkaller on 54ce1ed6b9fcb3b8d77c43dd4b3533e70cade414
testing commit 990f227371a400c0fbcb98b75c91a7dbd65f6132
compiler: gcc (GCC) 8.4.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 735181db9cf2e18986f05d6c7edc592d3fe083e7433e0ca97a4d10324e6ee55d
all runs: crashed: WARNING in dev_change_net_namespace
testing current HEAD 923dcc5eb0c111eccd51cc7ce1658537e3c38b25
testing commit 923dcc5eb0c111eccd51cc7ce1658537e3c38b25
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: dcf4b2e7a7c0fe4ecebcca95bed4d3f4682fe4f89908c2be00e7a79841ae8a7f
all runs: crashed: WARNING in __dev_change_net_namespace
revisions tested: 2, total time: 20m34.656462046s (build: 11m13.610579508s, test: 8m26.057801892s)
the crash still happens on HEAD
commit msg: Merge branch 'akpm' (patches from Andrew)
crash: WARNING in __dev_change_net_namespace
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffefe03947f R14: 00007fdc8d097300 R15: 0000000000022000
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8082 at net/core/dev.c:11257 __dev_change_net_namespace+0xe2c/0x10e0 net/core/dev.c:11263
Modules linked in:
CPU: 1 PID: 8082 Comm: syz-executor.2 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__dev_change_net_namespace+0xe2c/0x10e0 net/core/dev.c:11257
Code: 00 00 48 c7 c6 c0 98 be 88 48 c7 c7 00 99 be 88 c6 05 73 86 af 04 01 e8 83 2d a6 01 0f 0b e9 9e f2 ff ff 0f 0b e9 23 fc ff ff <0f> 0b e9 03 fc ff ff 41 bd ea ff ff ff e9 1a f4 ff ff e8 ed 9a d4
RSP: 0018:ffffc900028ded98 EFLAGS: 00010282
RAX: 00000000fffffff4 RBX: ffffffff8a545500 RCX: 1ffffffff189b5fe
RDX: 0000000000000000 RSI: ffffffff880b8c60 RDI: ffffffff885542a0
RBP: ffff888174494000 R08: 0000000000000001 R09: ffffffff8c4cec5f
R10: fffffbfff1899d8b R11: 000000000006e089 R12: ffff888174494c00
R13: ffff888174494098 R14: 00000000000000b0 R15: 0000000000000000
FS:  00007fdc8d097700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000055d000 CR3: 000000016243b004 CR4: 00000000003706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_setlink+0x20f/0x2d60 net/core/rtnetlink.c:2624
 __rtnl_newlink+0xaf5/0x13e0 net/core/rtnetlink.c:3391
 rtnl_newlink+0x5a/0x90 net/core/rtnetlink.c:3506
 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5571
 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2491
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x706/0xbf0 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:724
 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2409
 ___sys_sendmsg+0xd3/0x150 net/socket.c:2463
 __sys_sendmsg+0xb2/0x140 net/socket.c:2492
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x464d29
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:00007fdc8d097188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000055d040 RCX: 0000000000464d29
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00007fdc8d0971d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffefe03947f R14: 00007fdc8d097300 R15: 0000000000022000
 </TASK>
irq event stamp: 6341
hardirqs last  enabled at (6349): [<ffffffff81573283>] __up_console_sem+0xb3/0x120 kernel/printk/printk.c:255
hardirqs last disabled at (6376): [<ffffffff87a39070>] __schedule+0x1260/0x2700 kernel/sched/core.c:6149
softirqs last  enabled at (6396): [<ffffffff814232d4>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last  enabled at (6396): [<ffffffff814232d4>] __irq_exit_rcu+0x194/0x220 kernel/softirq.c:636
softirqs last disabled at (6407): [<ffffffff814232d4>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (6407): [<ffffffff814232d4>] __irq_exit_rcu+0x194/0x220 kernel/softirq.c:636
---[ end trace ff6bbc0f627c34db ]---