bisecting fixing commit since 27ce4f2a6817e38ca74c643d47a96359f6cc0c1c
building syzkaller on 77a55c8ea6070a9a88715db4c17e9612a7f99b21
testing commit 27ce4f2a6817e38ca74c643d47a96359f6cc0c1c with gcc (GCC) 8.4.1 20210217
kernel signature: afb3fd3f898c025bba3531c59fff01c6f2edba9ea3212ca1afd14ec22739739b
all runs: crashed: BUG: corrupted list in kobject_add_internal
testing current HEAD cf256fbcbe347b7d0ff58fe2dfa382a156bd3694
testing commit cf256fbcbe347b7d0ff58fe2dfa382a156bd3694 with gcc (GCC) 8.4.1 20210217
kernel signature: f888a47dbba3c94b0d36b7c1cbd44279f3da74f532faa6834a9e61da54ae163b
run #0: crashed: BUG: corrupted list in kobject_add_internal
run #1: crashed: BUG: corrupted list in kobject_add_internal
run #2: crashed: BUG: corrupted list in kobject_add_internal
run #3: crashed: WARNING in sysfs_warn_dup
run #4: crashed: BUG: corrupted list in kobject_add_internal
run #5: crashed: BUG: corrupted list in kobject_add_internal
run #6: crashed: BUG: corrupted list in kobject_add_internal
run #7: crashed: BUG: corrupted list in kobject_add_internal
run #8: crashed: BUG: corrupted list in kobject_add_internal
run #9: crashed: BUG: corrupted list in kobject_add_internal
revisions tested: 2, total time: 21m14.633269613s (build: 14m18.113679779s, test: 6m34.833484197s)
the crash still happens on HEAD
commit msg: Linux 4.14.231
crash: BUG: corrupted list in kobject_add_internal
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
list_add double add: new=ffff8881dc10c878, prev=ffff8881dc10c878, next=ffff8881f53bcd00.
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:31!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7714 Comm: kworker/u5:7 Not tainted 4.14.231-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci2 hci_rx_work
task: ffff8881dc0ee100 task.stack: ffff8881d3238000
RIP: 0010:__list_add_valid+0xaa/0xb0 lib/list_debug.c:29
RSP: 0018:ffff8881d323f820 EFLAGS: 00010282
RAX: 0000000000000058 RBX: ffff8881f53bcd00 RCX: 0000000000000000
RDX: 0000000000000058 RSI: ffffffff878b9120 RDI: ffffed103a647efb
RBP: ffff8881d323f838 R08: ffff8881dc0eea20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881dc10c878
R13: ffff8881dc10c888 R14: ffff8881f53bcd00 R15: ffff8881dc10c870
FS:  0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000055c071 CR3: 0000000008e6a003 CR4: 00000000001606e0
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:171 [inline]
 kobject_add_internal+0x165/0x8d0 lib/kobject.c:220
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_add+0x109/0x160 lib/kobject.c:409
 device_add+0x344/0x1530 drivers/base/core.c:1884
 hci_conn_add_sysfs+0x8e/0x150 net/bluetooth/hci_sysfs.c:53
 hci_sync_conn_complete_evt.isra.101+0x8bc/0xa50 net/bluetooth/hci_event.c:3769
 hci_event_packet+0x1c10/0x6f60 net/bluetooth/hci_event.c:5388
 hci_rx_work+0x378/0xa60 net/bluetooth/hci_core.c:4246
 process_one_work+0x74f/0x1620 kernel/workqueue.c:2116
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 75 e8 eb a9 48 89 f7 48 89 75 e8 e8 11 e1 60 fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 00 82 cc 87 e8 4a 41 f8 03 <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 
RIP: __list_add_valid+0xaa/0xb0 lib/list_debug.c:29 RSP: ffff8881d323f820
---[ end trace 5af464c40417c03f ]---