syzbot

 sign-in | mailing list | source | docs
🐞 Open [1646]
≡ Subsystems
🐞 Fixed [6009]
🐞 Invalid [14806]
⬇ Missing Backports [135]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KCSAN: data-race in do_sendfile / do_sendfile (3)

Status: auto-obsoleted due to no activity on 2023/03/17 22:50
Subsystems: fs
[Documentation on labels]
First crash: 753d, last: 753d
▶ ▼ Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_sendfile / do_sendfile (4) fs 4 641d 664d 0/28 auto-obsoleted due to no activity on 2023/06/02 10:13
upstream KCSAN: data-race in do_sendfile / do_sendfile fs 2 1076d 1091d 0/28 auto-closed as invalid on 2022/03/24 16:27
upstream KCSAN: data-race in do_sendfile / do_sendfile (9) fs 1 135d 135d 0/28 auto-obsoleted due to no activity on 2024/10/20 07:46
upstream KCSAN: data-race in do_sendfile / do_sendfile (7) fs 5 366d 415d 0/28 auto-obsoleted due to no activity on 2024/03/03 18:17
upstream KCSAN: data-race in do_sendfile / do_sendfile (6) fs 1 511d 511d 0/28 auto-obsoleted due to no activity on 2023/10/10 12:26
upstream KCSAN: data-race in do_sendfile / do_sendfile (10) fs 7 6d17h 76d 0/28 moderation: reported on 2024/11/13 18:24
upstream KCSAN: data-race in do_sendfile / do_sendfile (5) fs 3 552d 573d 0/28 auto-obsoleted due to no activity on 2023/08/30 17:21
upstream KCSAN: data-race in do_sendfile / do_sendfile (8) fs 2 191d 215d 0/28 auto-obsoleted due to no activity on 2024/08/25 22:44
upstream KCSAN: data-race in do_sendfile / do_sendfile (2) fs 1 892d 892d 0/28 auto-closed as invalid on 2022/09/24 23:59

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

write to 0xffff888103962c68 of 8 bytes by task 6074 on cpu 1:
 do_sendfile+0x745/0x910
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1309
 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

write to 0xffff888103962c68 of 8 bytes by task 6075 on cpu 0:
 do_sendfile+0x745/0x910
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1309
 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

value changed: 0x0000000000ffffc0 -> 0x00000000009bd000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6075 Comm: syz-executor.2 Tainted: G        W          6.2.0-rc2-syzkaller-00203-g1f5abbd77e2c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/06 22:16 upstream 1f5abbd77e2c 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in do_sendfile / do_sendfile
* Struck through repros no longer work on HEAD.