syzbot


general protection fault in p9_conn_cancel

Status: fixed on 2019/11/11 16:48
Subsystems: v9fs
[Documentation on labels]
Reported-by: syzbot+4d29d76a0da7a8c4d86c@syzkaller.appspotmail.com
Fix commit: 9f476d7c540c net/9p/trans_fd.c: fix race by holding the lock
First crash: 2114d, last: 2095d
Fix bisection: fixed by (bisect log) :
commit 9f476d7c540cb57556d3cc7e78704e6cd5100f5f
Author: Tomas Bortoli <tomasbortoli@gmail.com>
Date: Mon Jul 23 18:42:53 2018 +0000

  net/9p/trans_fd.c: fix race by holding the lock

  
Discussions (3)
Title Replies (including bot) Last reply
general protection fault in p9_conn_cancel 0 (2) 2019/11/07 13:42
Reminder: 18 open syzbot bugs in "fs/9p" subsystem 1 (1) 2019/07/24 01:46
Reminder: 18 open syzbot bugs in "fs/9p" subsystem 1 (1) 2019/07/02 06:29
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 general protection fault in p9_conn_cancel C 3 2071d 1837d 0/3 public: reported C repro on 2019/04/14 00:00

Sample crash report:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 1 PID: 2133 Comm: kworker/1:2 Not tainted 4.18.0-rc4+ #140
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
RIP: 0010:__lock_acquire+0x245/0x5020 kernel/locking/lockdep.c:3314
Code: 28 00 00 00 0f 85 03 34 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 c6 35 00 00 49 81 7d 00 60 86 e7 89 0f 84 42 ff 
RSP: 0018:ffff8801cd546e60 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff88f1b060
RBP: ffff8801cd5471e8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed003ac9b825 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000018 R14: ffff8801cd4f4680 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000203b9fdc CR3: 00000001ab7f9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
 p9_conn_cancel+0x166/0xd30 net/9p/trans_fd.c:205
 p9_poll_mux net/9p/trans_fd.c:620 [inline]
 p9_poll_workfn+0x4b2/0x6d0 net/9p/trans_fd.c:1107
 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
 kthread+0x345/0x410 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 7b21d69ebadc8360 ]---
RIP: 0010:__lock_acquire+0x245/0x5020 kernel/locking/lockdep.c:3314
Code: 28 00 00 00 0f 85 03 34 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 c6 35 00 00 49 81 7d 00 60 86 e7 89 0f 84 42 ff 
RSP: 0018:ffff8801cd546e60 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff88f1b060
RBP: ffff8801cd5471e8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed003ac9b825 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000018 R14: ffff8801cd4f4680 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000203b9fdc CR3: 00000001ab7f9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/11 02:04 upstream 30c2c32d7f70 2e0e3130 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/29 18:33 upstream a26fb01c2879 0824d7a1 .config console log report ci-upstream-kasan-gce-root
* Struck through repros no longer work on HEAD.