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KMSAN: uninit-value in fuse_fileattr_get

Status: upstream: reported C repro on 2026/02/06 03:37
Subsystems: fuse
[Documentation on labels]
Reported-by: syzbot+7c31755f2cea07838b0c@syzkaller.appspotmail.com
Fix commit: fs: init flags_valid before calling vfs_fileattr_get
Patched on: [ci-upstream-linux-next-kasan-gce-root ci-upstream-rust-kasan-gce], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 18d, last: 1d04h
▶ ▼ Duplicate bugs (1)
Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
KMSAN: uninit-value in ovl_fileattr_get overlayfs 7 C 7 9d21h 10d 0/29 closed as dup on 2026/02/11 09:00
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[syzbot] [fuse?] KMSAN: uninit-value in fuse_fileattr_get 3 (7) 2026/02/06 06:53
[PATCH] fs: init flags_valid before calling vfs_fileattr_get 1 (1) 2026/02/06 06:20
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2026/02/06 06:00 51m wangqing7171@gmail.com patch upstream OK log
2026/02/06 05:50 28m eadavis@qq.com patch upstream OK log
2026/02/06 03:46 29m wangqing7171@gmail.com patch upstream OK log

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in fuse_fileattr_get+0xeb4/0x1450 fs/fuse/ioctl.c:517
 fuse_fileattr_get+0xeb4/0x1450 fs/fuse/ioctl.c:517
 vfs_fileattr_get fs/file_attr.c:94 [inline]
 __do_sys_file_getattr fs/file_attr.c:416 [inline]
 __se_sys_file_getattr+0x6cb/0xbd0 fs/file_attr.c:372
 __x64_sys_file_getattr+0xe4/0x150 fs/file_attr.c:372
 x64_sys_call+0x17cd/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:469
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable fa.i created at:
 __do_sys_file_getattr fs/file_attr.c:380 [inline]
 __se_sys_file_getattr+0x8c/0xbd0 fs/file_attr.c:372
 __x64_sys_file_getattr+0xe4/0x150 fs/file_attr.c:372

CPU: 1 UID: 0 PID: 6065 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
=====================================================

Crashes (19):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/02 20:42 upstream 18f7fcd5e69a 018ebef2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/02 19:00 upstream 18f7fcd5e69a 018ebef2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/02 17:15 upstream 18f7fcd5e69a 018ebef2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/02 15:31 upstream 18f7fcd5e69a 018ebef2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/19 12:05 upstream 956b9cbd7f15 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/19 12:05 upstream 956b9cbd7f15 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/17 13:53 upstream 970296997869 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/13 13:36 upstream cee73b1e840c 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/13 13:35 upstream cee73b1e840c 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/13 00:29 upstream 37a93dd5c49b 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/13 00:29 upstream 37a93dd5c49b 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/08 14:21 upstream e7aa57247700 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/02 03:27 upstream 18f7fcd5e69a 6b8752f2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/02 03:27 upstream 18f7fcd5e69a 6b8752f2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/19 14:35 upstream 956b9cbd7f15 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/19 14:35 upstream 956b9cbd7f15 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/19 01:30 upstream 2961f841b025 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/13 15:05 upstream cee73b1e840c 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in fuse_fileattr_get
2026/02/13 04:03 upstream 37a93dd5c49b 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in fuse_fileattr_get
* Struck through repros no longer work on HEAD.