KCSAN: data-race in copy_mm / vm_mmap

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
95169ebf-81c9-41df-9fac-7ca73e90cddb	repro		💥	KCSAN: data-race in copy_mm / vm_mmap_pgoff (2)	2026/03/10 12:26	2026/03/10 12:26	2026/03/10 12:26	5c03941b7fba0fd3b0326afc981322c89fe9ba52+	failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 1
756de633-b99e-4507-934a-6634a919a959	assessment-kcsan	Benign: ✅ Confident: ✅	❓	KCSAN: data-race in copy_mm / vm_mmap_pgoff (2)	2026/02/25 00:49	2026/02/25 00:49	2026/02/25 00:59	305c0ec5cd886e2d13738e28e1b2df9b0ec20fc9
1010cd41-2933-4ecf-b607-4a4f1362a85e	assessment-kcsan		💥	KCSAN: data-race in copy_mm / vm_mmap_pgoff (2)	2026/02/07 21:42	2026/02/07 21:42	2026/02/07 21:47	97745f52f5b9361548048f53f0b3b51b9313fedf	fork/exec ./syz-agent: no such file or directory

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in copy_mm / vm_mmap_pgoff mm	6				1	116d	116d	0/29	auto-obsoleted due to no activity on 2026/01/17 14:15

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in copy_mm / vm_mmap_pgoff mm

116d

0/29

auto-obsoleted due to no activity on 2026/01/17 14:15

================================================================== BUG: KCSAN: data-race in copy_mm / vm_mmap_pgoff read-write to 0xffff8881043fd990 of 4 bytes by task 7712 on cpu 0: do_raw_write_seqcount_begin include/linux/seqlock.h:431 [inline] mm_lock_seqcount_begin include/linux/mmap_lock.h:88 [inline] mmap_write_lock_killable include/linux/mmap_lock.h:355 [inline] vm_mmap_pgoff+0x12f/0x2d0 mm/util.c:579 ksys_mmap_pgoff+0xc1/0x310 mm/mmap.c:604 x64_sys_call+0x16bb/0x3000 arch/x86/include/generated/asm/syscalls_64.h:10 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8881043fd7c0 of 1664 bytes by task 7721 on cpu 1: dup_mm kernel/fork.c:1523 [inline] copy_mm+0xe1/0x370 kernel/fork.c:1581 copy_process+0xcbd/0x1f10 kernel/fork.c:2221 kernel_clone+0x16b/0x5b0 kernel/fork.c:2651 __do_sys_clone kernel/fork.c:2792 [inline] __se_sys_clone kernel/fork.c:2776 [inline] __x64_sys_clone+0x143/0x180 kernel/fork.c:2776 x64_sys_call+0x12d0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 7721 Comm: syz.9.10168 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/07 21:42	upstream	e7aa57247700	4c131dc4	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in copy_mm / vm_mmap_pgoff

Crashes (1):

Assets (help?)