bisecting fixing commit since c076c79e03c6094e578df5d210fde808b3ad32e6
building syzkaller on 4ca1c0ea446d2c09b1fb49a85ae645e3754f1058
testing commit c076c79e03c6094e578df5d210fde808b3ad32e6 with gcc (GCC) 8.1.0
kernel signature: e858a8bdad42d63b794c40ca67b899633a36a67ba4b03736e37f10aa226ed18b
all runs: crashed: BUG: corrupted list in l2cap_chan_put
testing current HEAD 3207316b3beec7e38e5dbe2f463df0cec71e0b97
testing commit 3207316b3beec7e38e5dbe2f463df0cec71e0b97 with gcc (GCC) 8.1.0
kernel signature: 9a9a07f5a9cf00e822b9ef607dc70c40d1133d9d7e6e64819ca0c27e0eed2da2
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: 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
revisions tested: 2, total time: 30m15.433208594s (build: 17m32.387495598s, test: 12m11.901652485s)
the crash still happens on HEAD
commit msg: Linux 4.19.164
crash: BUG: corrupted list in l2cap_chan_put
Bluetooth: hci1: command 0x0419 tx timeout
Bluetooth: hci4: command 0x0419 tx timeout
Bluetooth: hci5: command 0x0419 tx timeout
list_del corruption, ffff8881e1cf0d88->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: 6233 Comm: kworker/u5:5 Not tainted 4.19.164-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci2 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 00 8a 67 87 e8 26 63 1d fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 a0 89 67 87 e8 12 63 1d fe <0f> 0b 48 89 de 48 c7 c7 c0 8a 67 87 e8 01 63 1d fe 0f 0b 48 89 de
RSP: 0018:ffff8881d67cf6f8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8881e1cf0d88 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87678700 RDI: ffffffff8a19da60
RBP: ffff8881d67cf710 R08: ffffed103ed25081 R09: ffffed103ed25080
R10: ffffed103ed25080 R11: ffff8881f6928407 R12: dead000000000200
R13: dead000000000100 R14: ffff8881e3250a40 R15: ffff8881e3250ac0
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000feeb50 CR3: 000000000846d002 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 8cbdf7c3e3012db5 ]---
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 00 8a 67 87 e8 26 63 1d fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 a0 89 67 87 e8 12 63 1d fe <0f> 0b 48 89 de 48 c7 c7 c0 8a 67 87 e8 01 63 1d fe 0f 0b 48 89 de
RSP: 0018:ffff8881d67cf6f8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8881e1cf0d88 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff87678700 RDI: ffffffff8a19da60
RBP: ffff8881d67cf710 R08: ffffed103ed25081 R09: ffffed103ed25080
R10: ffffed103ed25080 R11: ffff8881f6928407 R12: dead000000000200
R13: dead000000000100 R14: ffff8881e3250a40 R15: ffff8881e3250ac0
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000feeb50 CR3: 000000000846d002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400