syzbot

 sign-in | mailing list | source | docs
🐞 Open [987] ≡ Subsystems 🐞 Fixed [5238] 🐞 Invalid [12509] ⬇ Missing Backports [83] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

KCSAN: data-race in may_open.isra.0 / pid_update_inode

Status: closed as invalid on 2019/11/19 14:04
Subsystems: fs
[Documentation on labels]
First crash: 1630d, last: 1630d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in may_open.isra.0 / pid_update_inode (2) fs 3 1555d 1599d 0/26 auto-closed as invalid on 2020/04/01 20:30

Sample crash report:
==================================================================
BUG: KCSAN: data-race in may_open.isra.0 / pid_update_inode

write to 0xffff88812448e7f8 of 2 bytes by task 8456 on cpu 1:
 pid_update_inode+0x51/0x70 fs/proc/base.c:1820
 pid_revalidate+0x91/0xd0 fs/proc/base.c:1841
 d_revalidate fs/namei.c:758 [inline]
 d_revalidate fs/namei.c:755 [inline]
 lookup_fast+0x618/0x700 fs/namei.c:1612
 do_last fs/namei.c:3274 [inline]
 path_openat+0x2ac/0x36e0 fs/namei.c:3525
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812448e7f8 of 2 bytes by task 8461 on cpu 0:
 may_open.isra.0+0x4a/0x250 fs/namei.c:2945
 do_last fs/namei.c:3404 [inline]
 path_openat+0xf05/0x36e0 fs/namei.c:3525
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8461 Comm: ps Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/11/08 07:18 https://github.com/google/ktsan.git kcsan 94c006602e13 1e35461e .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.