bisecting fixing commit since e1f7d50ae3a3ec342e87a9b1ce6787bfb8b3c08b
building syzkaller on be5c2c81971442d623dd1b265dabf4644ceeb35b
testing commit e1f7d50ae3a3ec342e87a9b1ce6787bfb8b3c08b with gcc (GCC) 8.1.0
kernel signature: 9b865d9fb4b87bae6a72ab1f48a56ef40c69f853c4b432ece5919190985634c8
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: BUG: corrupted list in p9_read_work
testing current HEAD d71f695ce745df9544a85d8a762f16d72e72df00
testing commit d71f695ce745df9544a85d8a762f16d72e72df00 with gcc (GCC) 8.1.0
kernel signature: 4171a866713437d37a5696ea589480835b05941141ea833073fe197cd018828e
all runs: crashed: BUG: corrupted list in p9_read_work
revisions tested: 2, total time: 34m52.718576279s (build: 22m21.853488841s, test: 11m25.086994553s)
the crash still happens on HEAD
commit msg: Linux 4.14.179
crash: BUG: corrupted list in p9_read_work
list_del corruption, ffff888060b926a8->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: 2680 Comm: kworker/1:2 Not tainted 4.14.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_read_work
task: ffff88809fe62540 task.stack: ffff88809fe78000
RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45
RSP: 0018:ffff88809fe7fc68 EFLAGS: 00010286
RAX: 000000000000004e RBX: ffff888060b926a8 RCX: 0000000000000000
RDX: 000000000000004e RSI: ffffffff86cc2c40 RDI: ffffed1013fcff84
RBP: ffff88809fe7fc80 R08: ffff88809fe62e38 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: dead000000000200
R13: dead000000000100 R14: ffff888060b92680 R15: ffff88808f6d2338
FS:  0000000000000000(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000007fffffff CR3: 0000000093cd8000 CR4: 00000000001406e0
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: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: 7d 44 fe 0f 0b 4c 89 e2 48 89 de 48 c7 c7 e0 ce 03 87 e8 83 7d 44 fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 80 ce 03 87 e8 6f 7d 44 fe <0f> 0b 48 89 de 48 c7 c7 a0 cf 03 87 e8 5e 7d 44 fe 0f 0b 48 89 
RIP: __list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45 RSP: ffff88809fe7fc68
---[ end trace b5d70d7a4ebe6c50 ]---