bisecting fixing commit since c076c79e03c6094e578df5d210fde808b3ad32e6
building syzkaller on 0487ea6f5d997a8363eba0d2eb0ea7a925444555
testing commit c076c79e03c6094e578df5d210fde808b3ad32e6 with gcc (GCC) 8.1.0
kernel signature: adc004d9c7cd6cbecdbd69df17fd2e130cd58aec145efdba7c91fa5afb0c91be
run #0: crashed: BUG: corrupted list in l2cap_chan_put
run #1: crashed: BUG: corrupted list in l2cap_chan_put
run #2: crashed: BUG: corrupted list in l2cap_chan_put
run #3: crashed: BUG: corrupted list in l2cap_chan_put
run #4: crashed: BUG: corrupted list in l2cap_chan_put
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_put
run #6: crashed: BUG: corrupted list in l2cap_chan_put
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_put
run #8: crashed: BUG: corrupted list in l2cap_chan_put
run #9: crashed: BUG: corrupted list in l2cap_chan_put
testing current HEAD f5d8eef067acee3fda37137f4a08c0d3f6427a8e
testing commit f5d8eef067acee3fda37137f4a08c0d3f6427a8e with gcc (GCC) 8.1.0
kernel signature: e3c47655a7ae85a730658a957507e7139a8bbfda1d78eff5cad8796194d4dd69
all runs: crashed: BUG: corrupted list in l2cap_chan_put
revisions tested: 2, total time: 37m56.219742486s (build: 17m23.932170893s, test: 19m49.92952604s)
the crash still happens on HEAD
commit msg: Linux 4.19.154
crash: BUG: corrupted list in l2cap_chan_put
bond0 (unregistering): Releasing backup interface bond_slave_0
bond0 (unregistering): Released all slaves
IPVS: ftp: loaded support on port[0] = 21
list_del corruption, ffff8880a00fb888->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:47!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 22156 Comm: kworker/u5:0 Not tainted 4.19.154-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_rx_work
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45
Code: 1d fe 0f 0b 4c 89 e2 48 89 de 48 c7 c7 a0 80 67 87 e8 b6 a4 1d fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 40 80 67 87 e8 a2 a4 1d fe <0f> 0b 48 89 de 48 c7 c7 60 81 67 87 e8 91 a4 1d fe 0f 0b 48 89 de
RSP: 0018:ffff8880b53476f8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8880a00fb888 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87677da0 RDI: ffffffff8a19da60
RBP: ffff8880b5347710 R08: ffffed10174e5081 R09: ffffed10174e5080
R10: ffffed10174e5080 R11: ffff8880ba728407 R12: dead000000000200
R13: dead000000000100 R14: ffff8880b0c113c0 R15: ffff8880b0c11440
FS:  0000000000000000(0000) GS:ffff8880ba700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006e06c0 CR3: 000000000846d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 l2cap_chan_destroy net/bluetooth/l2cap_core.c:479 [inline]
 kref_put include/linux/kref.h:70 [inline]
 l2cap_chan_put+0x49/0x1a0 net/bluetooth/l2cap_core.c:496
 l2cap_conless_channel net/bluetooth/l2cap_core.c:6982 [inline]
 l2cap_recv_frame+0xf29/0xa440 net/bluetooth/l2cap_core.c:7029
 l2cap_recv_acldata+0x756/0x8a0 net/bluetooth/l2cap_core.c:7594
 hci_acldata_packet net/bluetooth/hci_core.c:4178 [inline]
 hci_rx_work+0x5e1/0x8e0 net/bluetooth/hci_core.c:4364
 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2155
 worker_thread+0x85/0xb60 kernel/workqueue.c:2298
 kthread+0x347/0x410 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace bc75acf6443f98de ]---
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45
Code: 1d fe 0f 0b 4c 89 e2 48 89 de 48 c7 c7 a0 80 67 87 e8 b6 a4 1d fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 40 80 67 87 e8 a2 a4 1d fe <0f> 0b 48 89 de 48 c7 c7 60 81 67 87 e8 91 a4 1d fe 0f 0b 48 89 de
RSP: 0018:ffff8880b53476f8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8880a00fb888 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87677da0 RDI: ffffffff8a19da60
RBP: ffff8880b5347710 R08: ffffed10174e5081 R09: ffffed10174e5080
R10: ffffed10174e5080 R11: ffff8880ba728407 R12: dead000000000200
R13: dead000000000100 R14: ffff8880b0c113c0 R15: ffff8880b0c11440
FS:  0000000000000000(0000) GS:ffff8880ba700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006e06c0 CR3: 000000000846d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400