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SubjectWARNING: kobject bug in add_one_compat_dev

syzbot found the following crash on:

HEAD commit: 732a0dee Merge branch 'mlxfw-Improve-error-reporting-and-F..
git tree: net-next
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

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:

kobject: (0000000004952746): attempted to be registered with empty name!
WARNING: CPU: 0 PID: 329 at lib/kobject.c:234 kobject_add_internal+0x7ac/0x9a0 lib/kobject.c:234
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 329 Comm: syz-executor.5 Not tainted 5.6.0-rc2-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+0x197/0x210 lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:221
__warn.cold+0x2f/0x3e kernel/panic.c:582
report_bug+0x289/0x300 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:174 [inline]
fixup_bug arch/x86/kernel/traps.c:169 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:kobject_add_internal+0x7ac/0x9a0 lib/kobject.c:234
Code: 1a 98 ca f9 e9 f0 f8 ff ff 4c 89 f7 e8 6d 98 ca f9 e9 95 f9 ff ff e8 c3 f0 8b f9 4c 89 e6 48 c7 c7 a0 0e 1a 89 e8 e3 41 5c f9 <0f> 0b 41 bd ea ff ff ff e9 52 ff ff ff e8 a2 f0 8b f9 0f 0b e8 9b
RSP: 0018:ffffc90005b27908 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff815eae46 RDI: fffff52000b64f13
RBP: ffffc90005b27960 R08: ffff88805aeba480 R09: ffffed1015d06659
R10: ffffed1015d06658 R11: ffff8880ae8332c7 R12: ffff8880a37fd000
R13: 0000000000000000 R14: ffff888096691780 R15: 0000000000000001
kobject_add_varg lib/kobject.c:390 [inline]
kobject_add+0x150/0x1c0 lib/kobject.c:442
device_add+0x3be/0x1d00 drivers/base/core.c:2412
add_one_compat_dev drivers/infiniband/core/device.c:901 [inline]
add_one_compat_dev+0x46a/0x7e0 drivers/infiniband/core/device.c:857
rdma_dev_init_net+0x2eb/0x490 drivers/infiniband/core/device.c:1120
ops_init+0xb3/0x420 net/core/net_namespace.c:137
setup_net+0x2d5/0x8b0 net/core/net_namespace.c:327
copy_net_ns+0x29e/0x5a0 net/core/net_namespace.c:468
create_new_namespaces+0x403/0xb50 kernel/nsproxy.c:108
unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:229
ksys_unshare+0x444/0x980 kernel/fork.c:2955
__do_sys_unshare kernel/fork.c:3023 [inline]
__se_sys_unshare kernel/fork.c:3021 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3021
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
RIP: 0033:0x45c429
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:00007f3be2b6dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f3be2b6e6d4 RCX: 000000000045c429
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c3e R14: 00000000004ce1f6 R15: 000000000076bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..

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