syzbot


general protection fault in p9_conn_cancel

Status: public: reported C repro on 2019/04/14 00:00
Reported-by: syzbot+601cb6ecf98aaa9c900b@syzkaller.appspotmail.com
First crash: 2171d, last: 2126d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in p9_conn_cancel v9fs C done 2 2150d 2168d 13/27 fixed on 2019/11/11 16:48

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] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 25 Comm: kworker/1:1 Not tainted 4.9.112-g9e79039 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
task: ffff8801d9aec800 task.stack: ffff8801d9428000
RIP: 0010:[<ffffffff81236beb>]  [<ffffffff81236beb>] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224
RSP: 0018:ffff8801d942f8e0  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018
RBP: ffff8801d942fa90 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8801d9aec800 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000018 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000046b5d0 CR3: 00000001cc939000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000041b58ab3 ffff8801d9aed0f0 0000000000000002 0000000000000001
 0000000000000000 ffff8801d9aed112 ffff8801d942fad0 0000000000000046
 0000000000000000 ffff8801d9aed0ea ffff8801d942fae8 0000000000000046
Call Trace:
 [<ffffffff8123acb0>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff839f9e9e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff839f9e9e>] _raw_spin_lock_irqsave+0x4e/0x62 kernel/locking/spinlock.c:159
 [<ffffffff839c2b5a>] p9_conn_cancel+0xaa/0x4c0 net/9p/trans_fd.c:201
 [<ffffffff839c34c2>] p9_poll_mux net/9p/trans_fd.c:630 [inline]
 [<ffffffff839c34c2>] p9_poll_workfn+0x222/0x330 net/9p/trans_fd.c:1097
 [<ffffffff8118d191>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118df86>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119d0bd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa11c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 25 28 00 00 00 0f 85 17 27 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 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 51 27 00 00 49 81 3e a0 8c e9 84 0f 84 08 f7 
RIP  [<ffffffff81236beb>] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224
 RSP <ffff8801d942f8e0>
---[ end trace e63856aea98d1302 ]---

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/11 17:51 https://android.googlesource.com/kernel/common android-4.9 9e7903954483 2e0e3130 .config console log report syz C ci-android-49-kasan-gce-root
2018/08/22 14:17 https://android.googlesource.com/kernel/common android-4.9 8dd3fc2ed765 95b5c82b .config console log report ci-android-49-kasan-gce-root
2018/07/09 00:35 https://android.googlesource.com/kernel/common android-4.9 03c70feafdb2 f25e5770 .config console log report ci-android-49-kasan-gce-386
* Struck through repros no longer work on HEAD.