bisecting fixing commit since c076c79e03c6094e578df5d210fde808b3ad32e6
building syzkaller on 0487ea6f5d997a8363eba0d2eb0ea7a925444555
testing commit c076c79e03c6094e578df5d210fde808b3ad32e6 with gcc (GCC) 8.1.0
kernel signature: 963036574ce999ab4aefb8a2f63c3da6b6d5b60650bed7b53fc35bfd3ae9ad73
all runs: crashed: BUG: corrupted list in l2cap_chan_put
testing current HEAD daefdc9eb24bfa11ab77a4b2a9c3923f1051fe0b
testing commit daefdc9eb24bfa11ab77a4b2a9c3923f1051fe0b with gcc (GCC) 8.1.0
kernel signature: 29349afecf4610d97df46d018fc0c8e3fb7fa316969c44388769e348c01163e1
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: BUG: corrupted list in l2cap_chan_put
run #6: crashed: BUG: corrupted list in l2cap_chan_put
run #7: OK
run #8: crashed: BUG: corrupted list in l2cap_chan_put
run #9: crashed: BUG: corrupted list in l2cap_chan_put
revisions tested: 2, total time: 39m20.551543843s (build: 19m17.61576089s, test: 19m26.634222177s)
the crash still happens on HEAD
commit msg: Linux 4.19.161
crash: BUG: corrupted list in l2cap_chan_put
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
list_del corruption, ffff8881f3cf3788->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: 15239 Comm: kworker/u5:2 Not tainted 4.19.161-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 60 88 67 87 e8 76 6d 1d fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 00 88 67 87 e8 62 6d 1d fe <0f> 0b 48 89 de 48 c7 c7 20 89 67 87 e8 51 6d 1d fe 0f 0b 48 89 de
RSP: 0018:ffff8881e9f276f8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8881f3cf3788 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87678560 RDI: ffffffff8a19ca60
RBP: ffff8881e9f27710 R08: ffffed103ed25081 R09: ffffed103ed25080
R10: ffffed103ed25080 R11: ffff8881f6928407 R12: dead000000000200
R13: dead000000000100 R14: ffff8881e2d7d940 R15: ffff8881e2d7d9c0
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006e06c0 CR3: 000000000846d003 CR4: 00000000001606e0
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 f211cecc898d6427 ]---
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 60 88 67 87 e8 76 6d 1d fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 00 88 67 87 e8 62 6d 1d fe <0f> 0b 48 89 de 48 c7 c7 20 89 67 87 e8 51 6d 1d fe 0f 0b 48 89 de
RSP: 0018:ffff8881e9f276f8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8881f3cf3788 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87678560 RDI: ffffffff8a19ca60
RBP: ffff8881e9f27710 R08: ffffed103ed25081 R09: ffffed103ed25080
R10: ffffed103ed25080 R11: ffff8881f6928407 R12: dead000000000200
R13: dead000000000100 R14: ffff8881e2d7d940 R15: ffff8881e2d7d9c0
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006e06c0 CR3: 000000000846d003 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400