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KCSAN: data-race in do_sendfile / do_sendfile (4)

Status: auto-obsoleted due to no activity on 2023/06/02 10:13
Subsystems: fs
[Documentation on labels]
First crash: 1088d, last: 1065d
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_sendfile / do_sendfile (3) fs 6 1 1177d 1177d 0/29 auto-obsoleted due to no activity on 2023/03/17 22:50
upstream KCSAN: data-race in do_sendfile / do_sendfile fs 6 2 1500d 1515d 0/29 auto-closed as invalid on 2022/03/24 16:27
upstream KCSAN: data-race in do_sendfile / do_sendfile (9) fs 6 1 559d 559d 0/29 auto-obsoleted due to no activity on 2024/10/20 07:46
upstream KCSAN: data-race in do_sendfile / do_sendfile (7) fs 6 5 790d 839d 0/29 auto-obsoleted due to no activity on 2024/03/03 18:17
upstream KCSAN: data-race in do_sendfile / do_sendfile (6) fs 6 1 935d 935d 0/29 auto-obsoleted due to no activity on 2023/10/10 12:26
upstream KCSAN: data-race in do_sendfile / do_sendfile (10) fs 6 26 84d 500d 0/29 auto-obsoleted due to no activity on 2026/03/01 02:25
upstream KCSAN: data-race in do_sendfile / do_sendfile (5) fs 6 3 976d 997d 0/29 auto-obsoleted due to no activity on 2023/08/30 17:21
upstream KCSAN: data-race in do_sendfile / do_sendfile (8) fs 6 2 615d 639d 0/29 auto-obsoleted due to no activity on 2024/08/25 22:44
upstream KCSAN: data-race in do_sendfile / do_sendfile (2) fs 6 1 1316d 1316d 0/29 auto-closed as invalid on 2022/09/24 23:59

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

write to 0xffff888137e75a68 of 8 bytes by task 2644 on cpu 0:
 do_sendfile+0x777/0x950
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff888137e75a68 of 8 bytes by task 2639 on cpu 1:
 do_sendfile+0x777/0x950
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0x0000000000080000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2639 Comm: syz-executor.2 Not tainted 6.3.0-syzkaller-10125-g35fab9271b7e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
==================================================================

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/04/28 10:06 upstream 35fab9271b7e 70a605de .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_sendfile / do_sendfile
2023/04/19 10:46 upstream af67688dca57 94b4184e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_sendfile / do_sendfile
2023/04/06 21:03 upstream f2afccfefe7b 00ce4c67 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_sendfile / do_sendfile
2023/04/05 07:53 upstream 76f598ba7d8e 831373d3 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in do_sendfile / do_sendfile
* Struck through repros no longer work on HEAD.