bisecting fixing commit since 0c88e405c97ed1828443b67891e6d4bb6e56cd4e
building syzkaller on 486f93ef445f733b35d844f33ba9edeb8423f5fa
testing commit 0c88e405c97ed1828443b67891e6d4bb6e56cd4e with gcc (GCC) 8.4.1 20210217
kernel signature: 47bb5e11132f086a50f8daa60f8ada9053a417afdc6c2a7f71fc029db7cb8205
all runs: crashed: BUG: corrupted list in kobject_add_internal
testing current HEAD eb575cd5d7f60241d016fdd13a9e86d962093c9b
testing commit eb575cd5d7f60241d016fdd13a9e86d962093c9b with gcc (GCC) 8.4.1 20210217
kernel signature: bb921729965b6745de8b05df1444c4ee8cbd42f7acc2f0d7b6ccac834bc81a75
all runs: crashed: BUG: corrupted list in kobject_add_internal
revisions tested: 2, total time: 29m13.61076027s (build: 22m7.983118916s, test: 6m34.920566415s)
the crash still happens on HEAD
commit msg: Linux 4.19.195
crash: BUG: corrupted list in kobject_add_internal
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
list_add double add: new=ffff8880a95e2d58, prev=ffff8880a95e2d58, next=ffff8880b5927700.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:31!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8476 Comm: kworker/u5:6 Not tainted 4.19.195-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci3 hci_rx_work
RIP: 0010:__list_add_valid+0xaa/0xb0 lib/list_debug.c:29
Code: e8 eb a9 48 89 f7 48 89 75 e8 e8 c1 6f 44 fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 80 22 50 88 e8 ef f2 3a 04 <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55
RSP: 0018:ffff8880aa1f77e8 EFLAGS: 00010282
RAX: 0000000000000058 RBX: ffff8880b5927700 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88502040 RDI: ffffffff8bad8720
RBP: ffff8880aa1f7800 R08: ffffed1017444e99 R09: ffffed1017444e98
R10: ffffed1017444e98 R11: ffff8880ba2274c7 R12: ffff8880a95e2d58
R13: ffff8880a95e2d68 R14: ffff8880b5927700 R15: ffff8880a95e2d50
FS:  0000000000000000(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dace98a8b8 CR3: 0000000099e46000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_add include/linux/list.h:60 [inline]
 list_add_tail include/linux/list.h:93 [inline]
 kobj_kset_join lib/kobject.c:188 [inline]
 kobject_add_internal+0x165/0x8d0 lib/kobject.c:238
 kobject_add_varg lib/kobject.c:382 [inline]
 kobject_add+0x10f/0x170 lib/kobject.c:426
 device_add+0x33e/0x16b0 drivers/base/core.c:2121
 hci_conn_add_sysfs+0x8e/0x160 net/bluetooth/hci_sysfs.c:53
 hci_sync_conn_complete_evt.isra.112+0x8bc/0xa50 net/bluetooth/hci_event.c:4091
 hci_event_packet+0x1a08/0x68e0 net/bluetooth/hci_event.c:5858
 hci_rx_work+0x385/0xa70 net/bluetooth/hci_core.c:4366
 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153
 worker_thread+0x85/0xb60 kernel/workqueue.c:2296
 kthread+0x347/0x410 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace 736ccc22c0649db0 ]---
RIP: 0010:__list_add_valid+0xaa/0xb0 lib/list_debug.c:29
Code: e8 eb a9 48 89 f7 48 89 75 e8 e8 c1 6f 44 fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 80 22 50 88 e8 ef f2 3a 04 <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55
RSP: 0018:ffff8880aa1f77e8 EFLAGS: 00010282
RAX: 0000000000000058 RBX: ffff8880b5927700 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88502040 RDI: ffffffff8bad8720
RBP: ffff8880aa1f7800 R08: ffffed1017444e99 R09: ffffed1017444e98
R10: ffffed1017444e98 R11: ffff8880ba2274c7 R12: ffff8880a95e2d58
R13: ffff8880a95e2d68 R14: ffff8880b5927700 R15: ffff8880a95e2d50
FS:  0000000000000000(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dace98a8b8 CR3: 0000000099e46000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400