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WARNING in kernfs_get (5)

Status: upstream: reported syz repro on 2024/05/08 11:07
Subsystems: usb kernfs
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+2f44671e54488d20f0e6@syzkaller.appspotmail.com
First crash: 764d, last: 7d13h
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: SYZFAIL: NL802154_CMD_SET_SHORT_ADDR failed (log)
Repro: syz .config
  
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision Error
660feb64-56af-4c9b-b16a-60d247ea6d97 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in kernfs_get (5) 2026/05/30 11:10 2026/05/30 11:10 2026/05/30 12:05 6b4a844333e83556da95d61d7f207e7ef5cd4bc6
97129227-8265-4ceb-ad7f-0b56e0949ac8 assessment-security 💥 WARNING in kernfs_get (5) 2026/05/14 09:48 2026/05/14 09:48 2026/05/14 09:49 6ccb967e465e832a7bfd7a116ad00d52a0923a5d failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: 29% (26208/88833) Updating files: 30% (26650/88833) Updating files: 31% (27539/88833) Updating files: 32% (28427/88833) Updating files: 33% (29315/88833) Updating files: 34% (30204/88833) Updating files: 35% (31092/88833) Updating files: 36% (31980/88833) Updating files: 37% (32869/88833) Updating files: 38% (33757/88833) Updating files: 39% (34645/88833) Updating files: 40% (35534/88833) Updating files: 40% (35572/88833) Updating files: 40% (35646/88833) error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_0_smn.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_11_0_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_11_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_2_0_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_2_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_4_0_smn.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_4_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_4_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_7_0_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_7_0_sh_mask.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_9_0_offset.h error: unable to write file drivers/gpu/drm/amd/include/asic_reg/nbio/nbio_7_9_0_sh_mask.h fatal: cannot create directory at 'drivers/gpu/drm/amd/include/asic_reg/oss': No space left on device
▶ ▼ Discussions (22)
Title Replies (including bot) Last reply
[syzbot] Monthly kernfs report (May 2026) 0 (1) 2026/05/31 04:32
[syzbot] Monthly kernfs report (Apr 2026) 0 (1) 2026/04/29 20:32
[syzbot] Monthly kernfs report (Mar 2026) 0 (1) 2026/03/31 08:06
[syzbot] Monthly kernfs report (Feb 2026) 0 (1) 2026/02/26 12:58
[syzbot] Monthly kernfs report (Jan 2026) 0 (1) 2026/01/26 07:12
[syzbot] Monthly kernfs report (Dec 2025) 0 (1) 2025/12/26 07:48
[syzbot] Monthly kernfs report (Nov 2025) 0 (1) 2025/11/25 08:46
[syzbot] Monthly kernfs report (Oct 2025) 0 (1) 2025/10/24 18:48
[syzbot] Monthly kernfs report (Sep 2025) 0 (1) 2025/09/23 13:33
[syzbot] Monthly kernfs report (Aug 2025) 0 (1) 2025/08/23 16:32
[syzbot] Monthly kernfs report (Jul 2025) 0 (1) 2025/07/23 10:04
[syzbot] Monthly kernfs report (Jun 2025) 0 (1) 2025/06/23 07:33
[syzbot] Monthly kernfs report (May 2025) 0 (1) 2025/05/21 14:55
[syzbot] Monthly kernfs report (Apr 2025) 0 (1) 2025/04/22 10:11
[syzbot] Monthly kernfs report (Mar 2025) 0 (1) 2025/03/19 21:29
[syzbot] Monthly kernfs report (Feb 2025) 0 (1) 2025/02/16 21:54
[syzbot] Monthly kernfs report (Jan 2025) 0 (1) 2025/01/16 10:12
[syzbot] Monthly kernfs report (Dec 2024) 0 (1) 2024/12/16 09:45
[syzbot] Monthly kernfs report (Nov 2024) 0 (1) 2024/11/15 11:25
[syzbot] Monthly kernfs report (Oct 2024) 0 (1) 2024/10/15 10:07
[syzbot] Monthly kernfs report (Jul 2024) 0 (1) 2024/07/09 14:10
[syzbot] [kernfs?] WARNING in kernfs_get (5) 3 (8) 2024/05/16 14:52
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 WARNING in kernfs_get -1 C done 14 2460d 2599d 1/1 fixed on 2019/12/05 23:59
linux-6.6 WARNING in kernfs_get -1 6 289d 344d 0/2 auto-obsoleted due to no activity on 2025/11/30 05:21
upstream WARNING in kernfs_get (2) kernfs -1 2 2079d 2098d 0/29 auto-closed as invalid on 2021/01/25 03:55
linux-4.14 WARNING in kernfs_get -1 C done 17 2484d 2604d 1/1 fixed on 2019/12/07 19:24
upstream WARNING in kernfs_get (4) kernfs -1 syz error 3 1215d 1219d 0/29 auto-obsoleted due to no activity on 2023/06/07 19:32
upstream WARNING in kernfs_get -1 C done 316 2498d 2827d 13/29 fixed on 2019/11/20 22:01
upstream WARNING in kernfs_get (3) kernfs -1 3 1644d 1648d 0/29 auto-closed as invalid on 2022/02/04 06:25
android-414 WARNING in kernfs_get -1 syz 69 2462d 2615d 0/1 public: reported syz repro on 2019/04/10 15:44
▶ ▼ Last patch testing requests (13)
Created Duration User Patch Repo Result
2026/05/07 00:01 30m retest repro linux-next OK log
2026/05/07 00:01 41m retest repro upstream OK log
2026/05/07 00:01 48m retest repro upstream report log
2026/05/07 00:01 1h21m retest repro upstream OK log
2026/05/07 00:01 1h20m retest repro linux-next OK log
2026/03/16 22:44 17m retest repro upstream OK log
2026/03/16 22:44 17m retest repro upstream log
2026/02/03 07:00 32m retest repro linux-next error
2026/02/03 07:00 20m retest repro linux-next error
2026/02/03 07:00 23m retest repro upstream OK log
2024/05/16 14:28 21m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 26dd54d03cd9 OK log
2024/05/15 10:33 2h32m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 26dd54d03cd9 OK log
2024/05/14 23:23 1h04m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 26dd54d03cd9 report log

Sample crash report:
usb 4-1: Direct firmware load for ueagle-atm/eagleII.fw failed with error -2
usb 4-1: Falling back to sysfs fallback for: ueagle-atm/eagleII.fw
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1165 at fs/kernfs/dir.c:537 kernfs_get+0x72/0x90 fs/kernfs/dir.c:537
Modules linked in:
CPU: 1 UID: 0 PID: 1165 Comm: kworker/1:2 Not tainted 6.15.0-rc4-syzkaller-00147-gebd297a2affa #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: events request_firmware_work_func
RIP: 0010:kernfs_get+0x72/0x90 fs/kernfs/dir.c:537
Code: e8 a3 b4 64 ff 48 89 df be 04 00 00 00 e8 36 ac c6 ff f0 ff 03 eb 05 e8 8c b4 64 ff 5b 5d c3 cc cc cc cc cc e8 7f b4 64 ff 90 <0f> 0b 90 eb d6 89 d9 80 e1 07 80 c1 03 38 c1 7c b6 48 89 df e8 35
RSP: 0018:ffffc90003fcf6c0 EFLAGS: 00010293
RAX: ffffffff825b0bd1 RBX: ffff88807f837d20 RCX: ffff888026ae8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88807f837d23 R09: 1ffff1100ff06fa4
R10: dffffc0000000000 R11: ffffed100ff06fa5 R12: ffff8880716df030
R13: 1ffff1100e2dbe07 R14: ffff8880716df038 R15: 1ffff1100e2dbe06
FS:  0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0015c2030 CR3: 000000007e6d2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sysfs_get include/linux/sysfs.h:816 [inline]
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x632/0xb40 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x155/0x220 lib/kobject.c:426
 device_add+0x408/0xb50 drivers/base/core.c:3630
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline]
 firmware_fallback_sysfs+0x2e4/0x9b0 drivers/base/firmware_loader/fallback.c:238
 _request_firmware+0xf83/0x15b0 drivers/base/firmware_loader/main.c:941
 request_firmware_work_func+0xaf/0x1c0 drivers/base/firmware_loader/main.c:1194
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (651):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/05/02 02:41 upstream ebd297a2affa 51b137cd .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/02/12 05:22 upstream 1e83ccd5921a 76a109e2 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in kernfs_get
2024/05/14 15:44 linux-next 26dd54d03cd9 fdb4c10c .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kernfs_get
2026/05/31 05:09 upstream 9d87d0fc8c8e 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in kernfs_get
2026/05/25 15:49 upstream e7ae89a0c97c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/18 23:19 upstream 4d3a2a466b8d 9f74d399 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/18 17:55 upstream 5200f5f493f7 55156e84 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/18 14:00 upstream 5200f5f493f7 55156e84 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/18 11:24 upstream 5200f5f493f7 55156e84 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/18 05:08 upstream e5d505e3664b de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/18 00:38 upstream e5d505e3664b de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/17 21:04 upstream e5d505e3664b de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/17 17:59 upstream 6916d5703ddf de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/17 15:00 upstream 6916d5703ddf de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/17 04:44 upstream 6916d5703ddf de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/16 23:53 upstream 6916d5703ddf de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/16 02:40 upstream d458a240344c 81fb92f3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/15 21:28 upstream d458a240344c 81fb92f3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/14 16:54 upstream e1914add2799 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/14 10:14 upstream e1914add2799 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/14 07:57 upstream e1914add2799 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/14 00:13 upstream e1914add2799 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/13 16:10 upstream 1d5dcaa3bd65 fec2a7ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/13 07:02 upstream c21b90f77687 a0949470 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in kernfs_get
2026/05/13 01:18 upstream c21b90f77687 a0949470 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in kernfs_get
2026/05/12 21:18 upstream c21b90f77687 a0949470 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/12 17:37 upstream 50897c955902 d5b1a17d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/12 00:37 upstream 50897c955902 d168f260 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/11 11:31 upstream 5d6919055dec e6eb7c0b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/11 07:00 upstream 5d6919055dec 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/05/10 11:44 upstream 1bfaee9d3351 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in kernfs_get
2026/05/10 06:46 upstream 1bfaee9d3351 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in kernfs_get
2026/05/10 05:04 upstream 1bfaee9d3351 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in kernfs_get
2026/04/22 16:00 upstream 6596a02b2078 4595e353 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kernfs_get
2026/04/20 05:36 upstream c1f49dea2b8f 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in kernfs_get
2026/04/19 18:21 upstream faeab166167f 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/04/19 13:48 upstream faeab166167f 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in kernfs_get
2026/04/18 23:48 upstream eb5249b12507 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in kernfs_get
2026/04/18 08:13 upstream 8541d8f725c6 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in kernfs_get
2026/04/15 04:19 upstream 508fed679541 e2e976a8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in kernfs_get
2025/12/29 18:22 upstream 7839932417dd d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2025/12/19 08:10 upstream 516471569089 d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in kernfs_get
2024/12/24 10:41 upstream f07044dd0df0 444551c4 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2024/05/04 10:57 upstream 3d25a941ea50 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kernfs_get
2026/04/19 19:26 upstream faeab166167f 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in kernfs_get
2026/02/27 01:17 upstream 3f4a08e64442 a2f13f71 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in kernfs_get
2026/02/23 12:36 upstream 6de23f81a5e0 7c9658af .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in kernfs_get
2025/02/18 22:13 net-next 4991b88c2514 c37c7249 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in kernfs_get
2026/05/24 12:43 linux-next c1ecb239fa34 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kernfs_get
2026/05/16 16:29 linux-next e98d21c170b0 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/05/15 03:22 linux-next e98d21c170b0 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/05/14 23:29 linux-next e98d21c170b0 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kernfs_get
2026/05/14 22:14 linux-next e98d21c170b0 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/05/14 04:30 linux-next e98d21c170b0 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/05/13 08:30 linux-next e98d21c170b0 a0949470 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/05/13 02:56 linux-next e98d21c170b0 a0949470 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/05/10 01:29 linux-next e98d21c170b0 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kernfs_get
2026/04/22 18:20 linux-next 70c8a7ec6715 4595e353 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/04/22 12:17 linux-next bee6ea30c487 4595e353 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/01/03 21:20 linux-next cc3aa43b44bd d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kernfs_get
2025/06/24 03:19 upstream 78f4e737a53e 1a7fb460 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in kernfs_get
2026/05/26 03:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 4b4362973b6f c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in kernfs_get
* Struck through repros no longer work on HEAD.