syzbot

 sign-in | mailing list | source | docs
🐞 Open [985] ≡ Subsystems 🐞 Fixed [5216] 🐞 Invalid [12474] ⬇ Missing Backports [82] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

KCSAN: data-race in copy_process / free_pid (7)

Status: auto-obsoleted due to no activity on 2022/10/14 18:22
Subsystems: kernel
[Documentation on labels]
First crash: 640d, last: 588d
▶ ▼ Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in copy_process / free_pid (8) kernel 1 497d 497d 0/26 auto-obsoleted due to no activity on 2023/01/17 03:08
upstream KCSAN: data-race in copy_process / free_pid kernel 1 1589d 1589d 0/26 auto-closed as invalid on 2020/02/20 19:37
upstream KCSAN: data-race in copy_process / free_pid (10) kernel 23 3d04h 131d 0/26 moderation: reported on 2023/12/10 00:02
upstream KCSAN: data-race in copy_process / free_pid (9) kernel 12 246d 332d 0/26 auto-obsoleted due to no activity on 2023/09/21 05:02
upstream KCSAN: data-race in copy_process / free_pid (6) kernel 2 688d 692d 0/26 auto-closed as invalid on 2022/07/06 07:38
upstream KCSAN: data-race in copy_process / free_pid (4) kernel 1 993d 993d 0/26 auto-closed as invalid on 2021/09/04 11:26
upstream KCSAN: data-race in copy_process / free_pid (5) kernel 32 829d 948d 0/26 auto-closed as invalid on 2022/02/15 18:33
upstream KCSAN: data-race in copy_process / free_pid (2) kasan 1 1504d 1504d 0/26 auto-closed as invalid on 2020/05/15 22:36
upstream KCSAN: data-race in copy_process / free_pid (3) kernel 1 1183d 1183d 0/26 auto-closed as invalid on 2021/02/26 04:07

Sample crash report:
==================================================================
BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85c53358 of 4 bytes by task 8717 on cpu 0:
 free_pid+0x71/0x180 kernel/pid.c:136
 copy_process+0x197f/0x2140 kernel/fork.c:2509
 kernel_clone+0x163/0x5c0 kernel/fork.c:2673
 __do_sys_clone kernel/fork.c:2807 [inline]
 __se_sys_clone kernel/fork.c:2791 [inline]
 __x64_sys_clone+0xc3/0xf0 kernel/fork.c:2791
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff85c53358 of 4 bytes by task 2 on cpu 1:
 copy_process+0x1583/0x2140 kernel/fork.c:2423
 kernel_clone+0x163/0x5c0 kernel/fork.c:2673
 kernel_thread+0x74/0xa0 kernel/fork.c:2726
 create_kthread kernel/kthread.c:399 [inline]
 kthreadd+0x296/0x340 kernel/kthread.c:745
 ret_from_fork+0x1f/0x30

value changed: 0x800000e8 -> 0x800000e7

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2 Comm: kthreadd Not tainted 6.0.0-rc4-syzkaller-00204-g9b4509495418-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
==================================================================

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/09/09 18:18 upstream 9b4509495418 90058bdc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in copy_process / free_pid
2022/09/05 17:09 upstream 7e18e42e4b28 922294ab .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in copy_process / free_pid
2022/08/16 00:58 upstream 7ebfc85e2cd7 7a7cb304 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in copy_process / free_pid
2022/07/19 12:42 upstream ca85855bdcae 72a3cc0c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in copy_process / free_pid
* Struck through repros no longer work on HEAD.