syzbot


WARNING in kcov_remote_start (6)

Status: upstream: reported on 2024/11/04 21:25
Subsystems: kernel
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+3f51ad7ac3ae57a6fdcc@syzkaller.appspotmail.com
First crash: 597d, last: now
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
7c1201c5-4757-41b5-9431-8475cd496bd3 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in kcov_remote_start (6) 2026/05/24 13:26 2026/05/24 13:26 2026/05/24 14:13 c69befb30ac10e158cc9d1557b508ee3f0eca1de

			
		
Discussions (11)
Title Replies (including bot) Last reply
[PATCH] kcov: fix potential kcov_mode corruption under CONFIG_PREEMPT_RT 5 (5) 2026/05/21 08:38
[syzbot] [wireless?] WARNING in kcov_remote_start (6) 0 (2) 2026/05/07 11:10
[PATCH (draft)] kcov: fix potential kcov_mode corruption under CONFIG_PREEMPT_RT 2 (2) 2026/05/04 15:39
[syzbot] Monthly wireless report (May 2026) 0 (1) 2026/05/02 12:32
[syzbot] Monthly wireless report (Apr 2026) 0 (1) 2026/04/01 07:42
[syzbot] Monthly wireless report (Mar 2026) 0 (1) 2026/03/01 06:22
[syzbot] Monthly wireless report (Jan 2026) 0 (1) 2026/01/28 22:39
[syzbot] Monthly usb report (Dec 2025) 0 (1) 2025/12/29 08:12
[syzbot] Monthly wireless report (Dec 2025) 0 (1) 2025/12/29 08:12
[syzbot] Monthly wireless report (Nov 2025) 0 (1) 2025/11/27 07:44
[syzbot] Monthly wireless report (Oct 2025) 0 (1) 2025/10/27 08:42
Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in kcov_remote_start (2) -1 1 114d 114d 0/3 auto-obsoleted due to no activity on 2026/06/06 04:25
linux-5.15 WARNING in kcov_remote_start -1 4 527d 626d 0/3 auto-obsoleted due to no activity on 2025/04/19 19:40
linux-6.6 WARNING in kcov_remote_start -1 1 30d 30d 0/2 upstream: reported on 2026/05/22 01:58
upstream WARNING in kcov_remote_start (4) usb -1 107983 710d 741d 26/29 fixed on 2024/07/10 08:24
upstream WARNING in kcov_remote_start (2) usb -1 C 1153 2482d 2482d 0/29 closed as invalid on 2019/09/04 14:27
upstream WARNING in kcov_remote_start (5) wireless -1 4243 606d 706d 28/29 fixed on 2024/10/22 14:56
upstream WARNING in kcov_remote_start (3) usb -1 265513 745d 814d 25/29 fixed on 2024/06/05 13:52
upstream WARNING in kcov_remote_start usb -1 C 655 2482d 2482d 0/29 closed as invalid on 2019/09/03 16:37
linux-6.1 WARNING in kcov_remote_start -1 13 20h36m 357d 0/3 upstream: reported on 2025/06/28 15:34

Sample crash report:
------------[ cut here ]------------
in_task() && kcov_mode_enabled(mode)
WARNING: kernel/kcov.c:884 at kcov_remote_start+0x5bb/0x6f0 kernel/kcov.c:884, CPU#1: kworker/u8:19/6447
Modules linked in:
CPU: 1 UID: 0 PID: 6447 Comm: kworker/u8:19 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:kcov_remote_start+0x5bb/0x6f0 kernel/kcov.c:884
Code: 03 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 fc 96 e1 02 90 0f 0b 90 eb d1 90 0f 0b 90 0f b7 83 c0 04 00 00 e9 b7 fa ff ff 90 <0f> 0b 90 eb 04 90 0f 0b 90 e8 87 47 5c 09 89 c0 48 c7 c7 c0 52 6e
RSP: 0018:ffffc9000703f9f8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff888026979f00 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8ba7f080 RDI: ffffffff8ba7f040
RBP: ffff88803a29a3c0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f1375f R12: dffffc0000000000
R13: ffff888039f05f58 R14: 0000000000000000 R15: ffff888061781180
FS:  0000000000000000(0000) GS:ffff888126244000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd603c58e9c CR3: 0000000028b0c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kcov_remote_start_common include/linux/kcov.h:50 [inline]
 ieee80211_iface_work+0x20c/0x1010 net/mac80211/iface.c:1812
 cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:538
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (31962):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/21 03:35 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/21 02:46 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/21 02:42 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/21 00:21 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 20:04 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 17:50 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 16:11 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 15:51 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 13:30 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 12:28 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 11:05 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 10:12 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 09:33 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 09:24 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 08:13 upstream 1a3746ccbb0a 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 05:01 upstream c98d767b3457 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 03:56 upstream c98d767b3457 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 02:11 upstream c98d767b3457 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/20 01:29 upstream c98d767b3457 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/19 22:28 upstream c98d767b3457 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/06/19 21:25 upstream c98d767b3457 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/05/24 12:17 upstream 4cbfe4502e3d c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/04/03 00:19 upstream 5619b098e2fb 8b15d4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in kcov_remote_start
2026/03/10 13:57 upstream 1f318b96cc84 4683d576 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/03/06 16:42 upstream 5ee8dbf54602 41d8037d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kcov_remote_start
2026/03/01 08:48 upstream 42eb01783091 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in kcov_remote_start
2026/01/29 08:52 upstream 8dfce8991b95 b78a7341 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in kcov_remote_start
2025/08/30 22:55 upstream 11e7861d680c 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in kcov_remote_start
2024/11/03 07:56 upstream 3e5e6c9900c3 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kcov_remote_start
2026/02/24 08:18 upstream 7dff99b35460 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in kcov_remote_start
2026/01/18 12:58 upstream d12453c7e281 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in kcov_remote_start
2025/09/02 13:14 upstream b320789d6883 96a211bc .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in kcov_remote_start
2025/12/28 12:00 upstream d26143bb38e2 d1b870e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in kcov_remote_start
2025/11/02 08:57 bpf ba36dd5ee6fd 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in kcov_remote_start
2025/10/12 09:27 net f3426ac54c42 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in kcov_remote_start
2026/05/07 17:37 bpf-next 2ca6723a5f7b e358bca5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in kcov_remote_start
2025/08/18 08:17 net-next bab3ce404553 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kcov_remote_start
2026/06/21 01:38 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/21 00:24 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 23:17 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 23:02 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 21:56 linux-next ec039126b7fa 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kcov_remote_start
2026/06/20 21:17 linux-next ec039126b7fa 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kcov_remote_start
2026/06/20 19:46 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 18:42 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 17:13 linux-next ec039126b7fa 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kcov_remote_start
2026/06/20 14:48 linux-next ec039126b7fa 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kcov_remote_start
2026/06/20 14:31 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 12:08 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 07:53 linux-next ec039126b7fa 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kcov_remote_start
2026/06/20 06:52 linux-next ec039126b7fa 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kcov_remote_start
2026/06/20 06:00 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 03:05 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/20 00:38 linux-next ec039126b7fa 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kcov_remote_start
2026/06/19 23:35 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/19 23:35 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/19 22:28 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/19 21:17 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/19 20:14 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2026/06/19 20:06 linux-next 3ce97bd3c4f1 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2024/10/31 21:14 linux-next f9f24ca362a4 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kcov_remote_start
2025/04/28 17:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in kcov_remote_start
* Struck through repros no longer work on HEAD.