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 2f111a6fd5b5297b4e92f53798ca086f7c7d33a4 testing commit 2f111a6fd5b5297b4e92f53798ca086f7c7d33a4 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 16e863f5706e913bf6073343506f874638112e947411372d32f237553fadf6ba all runs: crashed: WARNING in __dev_change_net_namespace revisions tested: 2, total time: 20m48.955008243s (build: 11m39.307868934s, test: 8m22.846151221s) the crash still happens on HEAD commit msg: Merge tag 'ceph-for-5.15-rc7' of git://github.com/ceph/ceph-client crash: WARNING in __dev_change_net_namespace RAX: ffffffffffffffda RBX: 000000000055d040 RCX: 0000000000464d29 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 00007f654eafd1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdf54ad88f R14: 00007f654eafd300 R15: 0000000000022000 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7989 at net/core/dev.c:11223 __dev_change_net_namespace+0xe5a/0x1120 net/core/dev.c:11229 Modules linked in: CPU: 0 PID: 7989 Comm: syz-executor.2 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__dev_change_net_namespace+0xe5a/0x1120 net/core/dev.c:11223 Code: 00 00 48 c7 c6 40 fe 9c 88 48 c7 c7 80 fe 9c 88 c6 05 31 e5 97 04 01 e8 6b 64 a4 01 0f 0b e9 71 f2 ff ff 0f 0b e9 1d fc ff ff <0f> 0b e9 fc fb ff ff 41 bd ea ff ff ff e9 17 f4 ff ff e8 8f e7 de RSP: 0018:ffffc9000310ed98 EFLAGS: 00010282 RAX: 00000000fffffff4 RBX: ffffffff8a329b40 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff87eb8780 RDI: ffffffff88347cc0 RBP: ffff888179aea000 R08: 0000000000000000 R09: ffff8881f6433d8b R10: ffffed103ec867b1 R11: 6637303030302052 R12: ffff888179aeac00 R13: ffff888179aea098 R14: 00000000000000a2 R15: 0000000000000000 FS: 00007f654eafd700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa97f56c028 CR3: 0000000162e0a006 CR4: 00000000003706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:5572 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2510 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:1935 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:00007f654eafd188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000055d040 RCX: 0000000000464d29 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 00007f654eafd1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdf54ad88f R14: 00007f654eafd300 R15: 0000000000022000 irq event stamp: 5531 hardirqs last enabled at (5539): [] __up_console_sem+0xb3/0x120 kernel/printk/printk.c:255 hardirqs last disabled at (5570): [] __schedule+0x116d/0x2170 kernel/sched/core.c:6183 softirqs last enabled at (5602): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last enabled at (5602): [] __irq_exit_rcu+0x194/0x220 kernel/softirq.c:636 softirqs last disabled at (5615): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (5615): [] __irq_exit_rcu+0x194/0x220 kernel/softirq.c:636 ---[ end trace 2f5d93ffeecef2af ]---