bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on ff51e5229e0ee846d2fd687cb0dbca13de758c66
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75 with gcc (GCC) 8.4.1 20210217
kernel signature: 3dfc7d9ffebbb8e3be4f149eae1ac7a5d61c34ad44c5d540dd4cb0af5ad010d3
run #0: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #1: crashed: BUG: corrupted list in l2cap_chan_put
run #2: crashed: BUG: corrupted list in l2cap_chan_put
run #3: crashed: KASAN: use-after-free Read 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: BUG: corrupted list in l2cap_chan_put
run #8: crashed: BUG: corrupted list in l2cap_chan_put
run #9: crashed: BUG: corrupted list in l2cap_chan_put
run #10: crashed: BUG: corrupted list in l2cap_chan_put
run #11: crashed: BUG: corrupted list in l2cap_chan_put
run #12: crashed: BUG: corrupted list in l2cap_chan_put
run #13: crashed: BUG: corrupted list in l2cap_chan_put
run #14: crashed: BUG: corrupted list in l2cap_chan_put
run #15: crashed: BUG: corrupted list in l2cap_chan_put
run #16: crashed: BUG: corrupted list in l2cap_chan_put
run #17: crashed: BUG: corrupted list in l2cap_chan_put
run #18: crashed: BUG: corrupted list in l2cap_chan_put
run #19: crashed: BUG: corrupted list in l2cap_chan_put
testing current HEAD 29c52025152bab4c557d8174da58f1a4c8e70438
testing commit 29c52025152bab4c557d8174da58f1a4c8e70438 with gcc (GCC) 8.4.1 20210217
kernel signature: d8df5ee33e493e1bffd53ba183fd1e58d523cc786c5499a58cd89dde33afd336
run #0: crashed: BUG: corrupted list in l2cap_chan_put
run #1: crashed: BUG: corrupted list in l2cap_chan_put
run #2: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
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: BUG: corrupted list 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: 33m53.646193066s (build: 14m54.95265096s, test: 18m3.255406045s)
the crash still happens on HEAD
commit msg: Linux 4.14.221
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, ffff8881d6ba3828->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:47!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 26628 Comm: kworker/u5:1 Not tainted 4.14.221-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_rx_work
task: ffff8881d3a566c0 task.stack: ffff8881c7e58000
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x4a lib/list_debug.c:45
RSP: 0018:ffff8881c7e5f7e0 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8881d6ba3828 RCX: 0000000000000000
RDX: 000000000000004e RSI: ffffffff86cbeba0 RDI: ffffed1038fcbef3
RBP: ffff8881c7e5f7f8 R08: ffff8881d3a56fb8 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: dead000000000200
R13: dead000000000100 R14: ffff8881ef330cc0 R15: ffff8881ef330d40
FS:  0000000000000000(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001dd6608 CR3: 0000000007e6a002 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+0xeca/0x9e10 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:4066 [inline]
 hci_rx_work+0x5c9/0x8e0 net/bluetooth/hci_core.c:4249
 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: 86 f9 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 e0 0c 04 87 e8 d4 86 f9 ff 0f 0b 4c 89 ea 48 89 de 48 c7 c7 80 0c 04 87 e8 c0 86 f9 ff <0f> 0b 48 89 de 48 c7 c7 a0 0d 04 87 e8 af 86 f9 ff 0f 0b 48 89 
RIP: __list_del_entry_valid.cold.1+0x26/0x4a lib/list_debug.c:45 RSP: ffff8881c7e5f7e0
---[ end trace 47914b24040d47d2 ]---