KCSAN: data-race in _copy_from_iter / _copy_from_iter

Status: auto-obsoleted due to no activity on 2023/08/24 22:03
Subsystems: mm
[Documentation on labels]
First crash: 1165d, last: 1120d
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in _copy_from_iter / _copy_from_iter (5) prio:low mm 6 153 2d20h 501d 0/29 moderation: reported on 2025/03/31 12:44
upstream KCSAN: data-race in _copy_from_iter / _copy_from_iter (4) mm 6 7 568d 644d 0/29 auto-obsoleted due to no activity on 2025/03/20 10:28
upstream KCSAN: data-race in _copy_from_iter / _copy_from_iter (3) mm 6 12 724d 837d 0/29 auto-obsoleted due to no activity on 2024/09/24 07:08
upstream KCSAN: data-race in _copy_from_iter / _copy_from_iter (2) mm 6 18 897d 978d 0/29 auto-obsoleted due to no activity on 2024/04/04 01:00

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

write to 0xffff8881269b8000 of 4096 bytes by task 32193 on cpu 1:
 instrument_copy_from_user_before include/linux/instrumented.h:130 [inline]
 copyin lib/iov_iter.c:192 [inline]
 _copy_from_iter+0x134/0xa40 lib/iov_iter.c:390
 copy_page_from_iter+0x162/0x290 lib/iov_iter.c:542
 process_vm_rw_pages mm/process_vm_access.c:43 [inline]
 process_vm_rw_single_vec mm/process_vm_access.c:117 [inline]
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x5d3/0x8c0 mm/process_vm_access.c:283
 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline]
 __x64_sys_process_vm_writev+0x7a/0x90 mm/process_vm_access.c:298
 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 0xffff8881269b8000 of 4096 bytes by task 32194 on cpu 0:
 instrument_copy_from_user_before include/linux/instrumented.h:130 [inline]
 copyin lib/iov_iter.c:192 [inline]
 _copy_from_iter+0x134/0xa40 lib/iov_iter.c:390
 copy_page_from_iter+0x162/0x290 lib/iov_iter.c:542
 process_vm_rw_pages mm/process_vm_access.c:43 [inline]
 process_vm_rw_single_vec mm/process_vm_access.c:117 [inline]
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x5d3/0x8c0 mm/process_vm_access.c:283
 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline]
 __x64_sys_process_vm_writev+0x7a/0x90 mm/process_vm_access.c:298
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 32194 Comm: syz-executor.1 Not tainted 6.5.0-rc2-syzkaller-00066-g46670259519f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
==================================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/07/20 22:02 upstream 46670259519f f49af159 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in _copy_from_iter / _copy_from_iter
2023/07/13 15:29 upstream eb26cbb1a754 86081196 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in _copy_from_iter / _copy_from_iter
2023/07/01 04:45 upstream e55e5df193d2 af3053d2 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in _copy_from_iter / _copy_from_iter
2023/06/27 02:43 upstream c0a572d9d32f 4cd5bb25 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in _copy_from_iter / _copy_from_iter
2023/06/25 04:55 upstream a92b7d26c743 79782afc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in _copy_from_iter / _copy_from_iter
2023/06/22 04:27 upstream dad9774deaf1 79782afc .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in _copy_from_iter / _copy_from_iter
2023/06/17 21:55 upstream 1b29d271614a f3921d4d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in _copy_from_iter / _copy_from_iter
2023/06/06 12:45 upstream f8dba31b0a82 a4ae4f42 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in _copy_from_iter / _copy_from_iter
* Struck through repros no longer work on HEAD.