bisecting fixing commit since e1f7d50ae3a3ec342e87a9b1ce6787bfb8b3c08b
building syzkaller on be5c2c81971442d623dd1b265dabf4644ceeb35b
testing commit e1f7d50ae3a3ec342e87a9b1ce6787bfb8b3c08b with gcc (GCC) 8.1.0
kernel signature: 1506ef61e95deed0d21eb149ba3a6a3fc24413afeb67f69e9e255cc3e09e995d
run #0: crashed: BUG: corrupted list in p9_read_work
run #1: crashed: BUG: corrupted list in p9_read_work
run #2: crashed: BUG: corrupted list in p9_read_work
run #3: crashed: BUG: corrupted list in p9_read_work
run #4: crashed: BUG: corrupted list in p9_read_work
run #5: crashed: BUG: corrupted list in p9_read_work
run #6: crashed: BUG: corrupted list in p9_read_work
run #7: crashed: BUG: corrupted list in p9_fd_cancelled
run #8: crashed: BUG: corrupted list in p9_read_work
run #9: crashed: no output from test machine
testing current HEAD 8bac50406cca10a219aa899243d49c57ddaf7c5b
testing commit 8bac50406cca10a219aa899243d49c57ddaf7c5b with gcc (GCC) 8.1.0
kernel signature: 1e632a448fc61afc0b8b9ca14098365b7615a43fcda862fa48701b2d98a0dcfc
all runs: crashed: BUG: corrupted list in p9_read_work
revisions tested: 2, total time: 36m53.258604649s (build: 18m33.802586986s, test: 17m45.65443866s)
the crash still happens on HEAD
commit msg: Linux 4.14.167
crash: BUG: corrupted list in p9_read_work
list_del corruption, ffff8880542ba128->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: 0 PID: 7049 Comm: kworker/0:4 Not tainted 4.14.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_read_work
task: ffff888093000400 task.stack: ffff88808b5f0000
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45
RSP: 0018:ffff88808b5f7c68 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff8880542ba128 RCX: 0000000000000000
RDX: 000000000000004e RSI: ffffffff86cc2c20 RDI: ffffed10116bef84
RBP: ffff88808b5f7c80 R08: ffff888093000cf0 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: dead000000000200
R13: dead000000000100 R14: ffff8880542ba100 R15: ffff888093a01378
FS:  0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 000000009e9bb000 CR4: 00000000001406f0
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]
 p9_read_work+0x7b0/0x10a0 net/9p/trans_fd.c:386
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2114
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2248
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: db 44 fe 0f 0b 4c 89 e2 48 89 de 48 c7 c7 60 c6 03 87 e8 c3 db 44 fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 00 c6 03 87 e8 af db 44 fe <0f> 0b 48 89 de 48 c7 c7 20 c7 03 87 e8 9e db 44 fe 0f 0b 48 89 
RIP: __list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45 RSP: ffff88808b5f7c68
---[ end trace 12d78989008a4fdc ]---