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KMSAN: uninit-value in vidtv_ts_null_write_into

Status: upstream: reported C repro on 2026/02/15 10:49
Subsystems: media
[Documentation on labels]
Reported-by: syzbot+96f901260a0b2d29cd1a@syzkaller.appspotmail.com
Fix commit: media: vidtv: fix pass-by-value structs causing MSAN warnings
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: 45d, last: 1d09h
▶ ▼ Discussions (5)
Title Replies (including bot) Last reply
[PATCH v2] media: vidtv: fix pass-by-value structs causing MSAN warnings 2 (2) 2026/02/21 21:51
Re: [PATCH] media: vidtv: fix uninitialized args.buf_sz passed by value 6 (6) 2026/02/21 10:31
Re: [syzbot] [media?] KMSAN: uninit-value in vidtv_ts_null_write_into 1 (2) 2026/02/21 02:21
[PATCH] media: vidtv: fix uninitialized args.buf_sz passed by value 3 (3) 2026/02/19 10:17
[syzbot] [media?] KMSAN: uninit-value in vidtv_ts_null_write_into 0 (1) 2026/02/15 10:49
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/02/20 22:10 54m abd.masalkhi@gmail.com patch upstream OK log

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in vidtv_ts_null_write_into+0x43e/0x5c0 drivers/media/test-drivers/vidtv/vidtv_ts.c:62
 vidtv_ts_null_write_into+0x43e/0x5c0 drivers/media/test-drivers/vidtv/vidtv_ts.c:62
 vidtv_mux_pad_with_nulls drivers/media/test-drivers/vidtv/vidtv_mux.c:366 [inline]
 vidtv_mux_tick+0x34b7/0x3e40 drivers/media/test-drivers/vidtv/vidtv_mux.c:411
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xae7/0x1d60 kernel/workqueue.c:3358
 worker_thread+0xede/0x1580 kernel/workqueue.c:3439
 kthread+0x53f/0x600 kernel/kthread.c:467
 ret_from_fork+0x20f/0x910 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was stored to memory at:
 vidtv_ts_null_write_into+0x437/0x5c0 drivers/media/test-drivers/vidtv/vidtv_ts.c:64
 vidtv_mux_pad_with_nulls drivers/media/test-drivers/vidtv/vidtv_mux.c:366 [inline]
 vidtv_mux_tick+0x34b7/0x3e40 drivers/media/test-drivers/vidtv/vidtv_mux.c:411
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xae7/0x1d60 kernel/workqueue.c:3358
 worker_thread+0xede/0x1580 kernel/workqueue.c:3439
 kthread+0x53f/0x600 kernel/kthread.c:467
 ret_from_fork+0x20f/0x910 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Local variable args.i134 created at:
 vidtv_mux_pad_with_nulls drivers/media/test-drivers/vidtv/vidtv_mux.c:351 [inline]
 vidtv_mux_tick+0x3150/0x3e40 drivers/media/test-drivers/vidtv/vidtv_mux.c:411
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xae7/0x1d60 kernel/workqueue.c:3358

CPU: 1 UID: 0 PID: 30 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events vidtv_mux_tick
=====================================================

Crashes (35):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/14 08:54 upstream cd7a5651db26 1e62d198 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/27 19:27 upstream 46b513250491 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/27 05:48 upstream 46b513250491 50cdcaa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/25 12:08 upstream bbeb83d3182a 35e4ff71 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/24 08:03 upstream c369299895a5 baf8bf12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/20 21:36 upstream c612261bedd6 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/14 13:54 upstream 1c9982b49613 ee8d34d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/10 22:01 upstream 1f318b96cc84 4683d576 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/09 17:19 upstream 1f318b96cc84 176bead5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/07 20:44 upstream 4ae12d8bd9a8 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/07 02:36 upstream 651690480a96 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/05 23:01 upstream c107785c7e8d d20b04c8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/01 10:29 upstream 42eb01783091 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/01 03:58 upstream 42eb01783091 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/28 10:51 upstream 4d349ee5c778 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/27 21:36 upstream aed968f8a6cd 2cf092b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/27 09:42 upstream a75cb869a8cc a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/26 17:57 upstream f4d0ec0aa20d ffa54287 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/21 19:37 upstream d79526b89571 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/20 23:33 upstream a95f71ad3e2e 741f5161 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/20 01:49 upstream 2b7a25df823d 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/17 15:00 upstream 970296997869 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/16 04:47 upstream bb7a3fc2c976 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/12 14:50 upstream c22e26bd0906 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/12 08:12 upstream c22e26bd0906 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/11 10:43 upstream dc855b77719f 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/17 11:17 upstream 2d1373e4246d c01bca74 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/15 18:51 upstream 267594792a71 ee8d34d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/12 07:12 upstream 80234b5ab240 2d88ab01 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/07 17:05 upstream 4ae12d8bd9a8 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/03/04 16:10 upstream 0031c06807cf e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/26 20:53 upstream f4d0ec0aa20d ffa54287 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/14 00:08 upstream cd7a5651db26 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/13 10:52 upstream cee73b1e840c 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
2026/02/12 05:21 upstream c22e26bd0906 76a109e2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in vidtv_ts_null_write_into
* Struck through repros no longer work on HEAD.