syzbot


WARNING in firmware_fallback_sysfs

Status: upstream: reported on 2025/06/17 10:18
Reported-by: syzbot+86b0dea5aa810f02bf47@syzkaller.appspotmail.com
First crash: 21h44m, last: 11h48m
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in firmware_fallback_sysfs usb fs C error error 3432 428d 1566d 0/28 auto-obsoleted due to no activity on 2024/06/24 11:12
linux-5.15 WARNING in firmware_fallback_sysfs missing-backport origin:upstream C error 170 1d11h 814d 0/3 upstream: reported C repro on 2023/03/26 17:15
linux-6.1 WARNING in firmware_fallback_sysfs origin:upstream missing-backport C error 178 1d05h 814d 0/3 upstream: reported C repro on 2023/03/26 16:24
upstream WARNING in firmware_fallback_sysfs (2) kernel 45 1d06h 312d 0/28 upstream: reported on 2024/08/09 15:45

Sample crash report:
------------[ cut here ]------------
sysfs group 'power' not found for kobject 'ueagle-atm!eagleII.fw'
WARNING: CPU: 1 PID: 5824 at fs/sysfs/group.c:284 sysfs_remove_group+0x178/0x2a0 fs/sysfs/group.c:282
Modules linked in:
CPU: 1 PID: 5824 Comm: kworker/1:5 Not tainted 6.6.93-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events request_firmware_work_func
RIP: 0010:sysfs_remove_group+0x178/0x2a0 fs/sysfs/group.c:282
Code: 48 8b 1b 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 ca d2 c9 ff 49 8b 17 48 c7 c7 40 bc ba 8a 48 89 de e8 b8 91 3b ff <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 b2 2d 71 ff
RSP: 0018:ffffc900049ff800 EFLAGS: 00010246
RAX: cbed941b744a9900 RBX: ffffffff8b2147e0 RCX: ffff88805e575a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: dffffc0000000000 R08: ffffc900049ff407 R09: 1ffff9200093fe80
R10: dffffc0000000000 R11: fffff5200093fe81 R12: 1ffffffff1642900
R13: 0000000000000001 R14: ffff88801aff90f8 R15: ffff8881462fb008
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe146ae56c0 CR3: 000000000cb30000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 device_del+0x251/0x900 drivers/base/core.c:3847
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:120 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline]
 firmware_fallback_sysfs+0x682/0x940 drivers/base/firmware_loader/fallback.c:234
 _request_firmware+0xed9/0x1510 drivers/base/firmware_loader/main.c:936
 request_firmware_work_func+0xb0/0x1b0 drivers/base/firmware_loader/main.c:1189
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/17 20:14 linux-6.6.y c2603c511feb e77fae15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in firmware_fallback_sysfs
2025/06/17 10:23 linux-6.6.y c2603c511feb cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in firmware_fallback_sysfs
2025/06/17 10:23 linux-6.6.y c2603c511feb cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in firmware_fallback_sysfs
2025/06/17 10:21 linux-6.6.y c2603c511feb cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in firmware_fallback_sysfs
2025/06/17 10:20 linux-6.6.y c2603c511feb cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in firmware_fallback_sysfs
2025/06/17 10:20 linux-6.6.y c2603c511feb cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in firmware_fallback_sysfs
2025/06/17 10:18 linux-6.6.y c2603c511feb cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in firmware_fallback_sysfs
2025/06/17 10:18 linux-6.6.y c2603c511feb cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in firmware_fallback_sysfs
* Struck through repros no longer work on HEAD.