syzbot <syzbot+830c6dbfc71edc4f0b8f@xxxxxxxxxxxxxxxxxxxxxxxxx> writes: > Hello, Has someone messed up the network device kobject support. I don't have the exact same code as listed here so I may be misreading things. But the only WARN_ON I see in dev_change_net_namespaces is from kobject_rename. It is not supposed to be possible for that to fail. Historically it only failed when network devices were put into sysfs in a way that required network devices to have names separate from sysfs files. We fixed that ages ago, so I don't have a clue why kobject_rename would be failing now. szybot any idea what network device was changing network namespaces? Eric > syzbot found the following crash on: > > HEAD commit: 0a679e13 Merge branch 'for-5.6-fixes' of git://git.kernel... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=15142701e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=6780df5a5f208964 > dashboard link: https://syzkaller.appspot.com/bug?extid=830c6dbfc71edc4f0b8f > compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+830c6dbfc71edc4f0b8f@xxxxxxxxxxxxxxxxxxxxxxxxx > > RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 > RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007 > R13: 00000000000009cb R14: 00000000004cb3dd R15: 0000000000000016 > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 24839 at net/core/dev.c:10108 dev_change_net_namespace+0x155f/0x16b0 net/core/dev.c:10108 > Kernel panic - not syncing: panic_on_warn set ... > CPU: 0 PID: 24839 Comm: syz-executor.4 Not tainted 5.6.0-rc1-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+0x1fb/0x318 lib/dump_stack.c:118 > panic+0x264/0x7a9 kernel/panic.c:221 > __warn+0x209/0x210 kernel/panic.c:582 > report_bug+0x1b6/0x2f0 lib/bug.c:195 > fixup_bug arch/x86/kernel/traps.c:174 [inline] > do_error_trap+0xcf/0x1c0 arch/x86/kernel/traps.c:267 > do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:286 > invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 > RIP: 0010:dev_change_net_namespace+0x155f/0x16b0 net/core/dev.c:10108 > Code: b7 f9 02 01 48 c7 c7 5d 66 e6 88 48 c7 c6 b4 42 04 89 ba 25 27 00 00 31 c0 e8 6d a6 dc fa 0f 0b e9 0d eb ff ff e8 a1 e6 0a fb <0f> 0b e9 2f fe ff ff e8 95 e6 0a fb c6 05 05 b7 f9 02 01 48 c7 c7 > RSP: 0018:ffffc90001ae7140 EFLAGS: 00010246 > RAX: ffffffff866c18df RBX: 00000000fffffff4 RCX: 0000000000040000 > RDX: ffffc90012028000 RSI: 000000000003ffff RDI: 0000000000040000 > RBP: ffffc90001ae7240 R08: ffffffff866c1700 R09: fffffbfff1406318 > R10: fffffbfff1406318 R11: 0000000000000000 R12: ffff8880918d2b60 > R13: ffff8880918d20b8 R14: ffffc90001ae71e8 R15: ffffc90001ae71e0 > do_setlink+0x196/0x3880 net/core/rtnetlink.c:2501 > __rtnl_newlink net/core/rtnetlink.c:3252 [inline] > rtnl_newlink+0x1509/0x1c00 net/core/rtnetlink.c:3377 > rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5438 > netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2477 > rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5456 > netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] > netlink_unicast+0x766/0x920 net/netlink/af_netlink.c:1328 > netlink_sendmsg+0xa2b/0xd40 net/netlink/af_netlink.c:1917 > sock_sendmsg_nosec net/socket.c:652 [inline] > sock_sendmsg net/socket.c:672 [inline] > ____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2343 > ___sys_sendmsg net/socket.c:2397 [inline] > __sys_sendmsg+0x1ed/0x290 net/socket.c:2430 > __do_sys_sendmsg net/socket.c:2439 [inline] > __se_sys_sendmsg net/socket.c:2437 [inline] > __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2437 > do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x45b3b9 > Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f483611ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00007f483611b6d4 RCX: 000000000045b3b9 > RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 > RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007 > R13: 00000000000009cb R14: 00000000004cb3dd R15: 0000000000000016 > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
