bisecting fixing commit since 27ce4f2a6817e38ca74c643d47a96359f6cc0c1c
building syzkaller on 77a55c8ea6070a9a88715db4c17e9612a7f99b21
testing commit 27ce4f2a6817e38ca74c643d47a96359f6cc0c1c with gcc (GCC) 8.1.0
kernel signature: fe34bc2036e32e243a93aebc31b4dcd2943aef4d81d15f6c6d01d1a51bc139fa
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: BUG: corrupted list in kobject_add_internal
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: WARNING in sysfs_warn_dup
testing current HEAD 3f2ecb86cb909da0b9157fd2952ad79924cbe5ae
testing commit 3f2ecb86cb909da0b9157fd2952ad79924cbe5ae with gcc (GCC) 8.1.0
kernel signature: a760ff279a622bf30cfbb520711cb7f81e6367b8f3427aa88fcadec988289d1b
all runs: crashed: BUG: corrupted list in kobject_add_internal
revisions tested: 2, total time: 26m31.87845852s (build: 20m15.62103605s, test: 5m33.863852196s)
the crash still happens on HEAD
commit msg: Linux 4.14.212
crash: BUG: corrupted list in kobject_add_internal
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_0
list_add double add: new=ffff8881db4dcbb8, prev=ffff8881db4dcbb8, next=ffff8881f4c8cf00.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:31!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7738 Comm: kworker/u5:8 Not tainted 4.14.212-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci4 hci_rx_work
task: ffff8881db69c240 task.stack: ffff8881d3b38000
RIP: 0010:__list_add_valid+0xaa/0xb0 lib/list_debug.c:29
IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready
RSP: 0018:ffff8881d3b3f820 EFLAGS: 00010282
RAX: 0000000000000058 RBX: ffff8881f4c8cf00 RCX: 0000000000000000
RDX: 0000000000000058 RSI: ffffffff878b9020 RDI: ffffed103a767efb
RBP: ffff8881d3b3f838 R08: ffff8881db69cb60 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: ffff8881db4dcbb8
R13: ffff8881db4dcbc8 R14: ffff8881f4c8cf00 R15: ffff8881db4dcbb0
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a924aa2000 CR3: 0000000008e6a006 CR4: 00000000001606f0
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:1869
device veth0_macvtap entered promiscuous mode
device veth1_macvtap entered promiscuous mode
 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
IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready
 hci_event_packet+0x1c10/0x6f13 net/bluetooth/hci_event.c:5385
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
 hci_rx_work+0x331/0xa50 net/bluetooth/hci_core.c:4244
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 process_one_work+0x74f/0x1620 kernel/workqueue.c:2116
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 worker_thread+0xcc/0xed0 kernel/workqueue.c:2250
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
 kthread+0x338/0x400 kernel/kthread.c:232
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
 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 c1 52 5b fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 e0 67 cc 87 e8 34 ea 20 fe <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 
batman_adv: batadv0: Interface activated: batadv_slave_0
48 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
89 e5 41 
RIP: __list_add_valid+0xaa/0xb0 lib/list_debug.c:29 RSP: ffff8881d3b3f820
---[ end trace f935e7232fbf372a ]---
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!