bisecting fixing commit since c076c79e03c6094e578df5d210fde808b3ad32e6
building syzkaller on 0487ea6f5d997a8363eba0d2eb0ea7a925444555
testing commit c076c79e03c6094e578df5d210fde808b3ad32e6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 6c605e9dd0dd8b89e65835b7a2314939e689abc3404a288709eb70e10a89ac66
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: 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: KASAN: use-after-free Read 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 b172b44fcb1771e083aad806fa96f3f60e2ddfac
testing commit b172b44fcb1771e083aad806fa96f3f60e2ddfac
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 075ccffe0ce264da20bc1205a755ad0b9cd1d9d036de78260afca47fe0935782
run #0: crashed: BUG: corrupted list in l2cap_chan_put
run #1: crashed: KASAN: use-after-free Write in l2cap_chan_create
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: 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: 40m2.516140907s (build: 20m40.552990121s, test: 18m46.241890954s)
the crash still happens on HEAD
commit msg: Linux 4.19.206
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, ffff8881d0e4ee48->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:47!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3187 Comm: kworker/u5:0 Not tainted 4.19.206-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+0x26/0x4a lib/list_debug.c:45
Code: f9 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 60 a7 67 87 e8 ae 68 f9 ff 0f 0b 4c 89 ea 48 89 de 48 c7 c7 00 a7 67 87 e8 9a 68 f9 ff <0f> 0b 48 89 de 48 c7 c7 20 a8 67 87 e8 89 68 f9 ff 0f 0b 48 89 de
RSP: 0018:ffff8881edf576f8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8881d0e4ee48 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8767a460 RDI: ffffffff8a19faa0
RBP: ffff8881edf57710 R08: ffffed103ed05091 R09: ffffed103ed05090
R10: ffffed103ed05090 R11: ffff8881f6828487 R12: dead000000000200
R13: dead000000000100 R14: ffff8881d410a0c0 R15: ffff8881d410a140
FS:  0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbaa97b71f8 CR3: 000000000846d001 CR4: 00000000001606f0
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:481 [inline]
 kref_put include/linux/kref.h:70 [inline]
 l2cap_chan_put+0x49/0x1a0 net/bluetooth/l2cap_core.c:498
 l2cap_conless_channel net/bluetooth/l2cap_core.c:6986 [inline]
 l2cap_recv_frame+0xf29/0xa430 net/bluetooth/l2cap_core.c:7033
 l2cap_recv_acldata+0x756/0x8a0 net/bluetooth/l2cap_core.c:7598
 hci_acldata_packet net/bluetooth/hci_core.c:4185 [inline]
 hci_rx_work+0x5d6/0x8f0 net/bluetooth/hci_core.c:4371
 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153
 worker_thread+0x85/0xb60 kernel/workqueue.c:2296
 kthread+0x347/0x410 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace 717d6a22050f7290 ]---
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x4a lib/list_debug.c:45
Code: f9 ff 0f 0b 4c 89 e2 48 89 de 48 c7 c7 60 a7 67 87 e8 ae 68 f9 ff 0f 0b 4c 89 ea 48 89 de 48 c7 c7 00 a7 67 87 e8 9a 68 f9 ff <0f> 0b 48 89 de 48 c7 c7 20 a8 67 87 e8 89 68 f9 ff 0f 0b 48 89 de
RSP: 0018:ffff8881edf576f8 EFLAGS: 00010282
RAX: 000000000000004e RBX: ffff8881d0e4ee48 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8767a460 RDI: ffffffff8a19faa0
RBP: ffff8881edf57710 R08: ffffed103ed05091 R09: ffffed103ed05090
R10: ffffed103ed05090 R11: ffff8881f6828487 R12: dead000000000200
R13: dead000000000100 R14: ffff8881d410a0c0 R15: ffff8881d410a140
FS:  0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbaa97b71f8 CR3: 000000000846d001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400