syzbot
WARNING in dummy_free_request (2)
Status:
upstream: reported C repro on 2026/07/29 00:10
Subsystems:
usb
Labels:
prio:normal
[Documentation on labels]
Reported-by: syzbot+c73e1942197af9f54ca3@syzkaller.appspotmail.com
First crash: 22d, last: 2d10h
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✨ AI Patch Versions (1)
Sample crash report:
gadgetfs: suspended from state 3
gadgetfs: disconnected
------------[ cut here ]------------
!list_empty(&req->queue)
WARNING: drivers/usb/gadget/udc/dummy_hcd.c:710 at dummy_free_request+0x6f/0x80 drivers/usb/gadget/udc/dummy_hcd.c:710, CPU#1: syz-executor587/5718
Modules linked in:
CPU: 1 UID: 0 PID: 5718 Comm: syz-executor587 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:dummy_free_request+0x6f/0x80 drivers/usb/gadget/udc/dummy_hcd.c:710
Code: 75 22 e8 d4 98 99 fa 48 89 df 5b 41 5e e9 39 38 f7 fa e8 c4 98 99 fa 90 0f 0b 90 5b 41 5e c3 cc cc cc cc cc e8 b2 98 99 fa 90 <0f> 0b 90 eb d8 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc90004717bf0 EFLAGS: 00010293
RAX: ffffffff872c2f7e RBX: ffff888043ad0000 RCX: ffff888031938000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff11003df0993 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff872c2f10 R12: ffff88801ef840a8
R13: dffffc0000000000 R14: ffff88801ef840a8 R15: ffff888043ad0010
FS: 000055557d671400(0000) GS:ffff888125d46000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f11655c40fc CR3: 0000000044e6e000 CR4: 00000000003526f0
Call Trace:
<TASK>
gadgetfs_unbind+0x1b2/0x2c0 drivers/usb/gadget/legacy/inode.c:1661
gadget_unbind_driver+0x1cb/0x410 drivers/usb/gadget/udc/core.c:1724
device_remove drivers/base/dd.c:616 [inline]
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372
driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1435
bus_remove_driver+0x229/0x320 drivers/base/bus.c:832
usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1784
dev_release+0x86/0x210 drivers/usb/gadget/legacy/inode.c:1198
__fput+0x42a/0xa80 fs/file_table.c:512
fput_close_sync+0x11f/0x240 fs/file_table.c:617
__do_sys_close fs/open.c:1511 [inline]
__se_sys_close fs/open.c:1496 [inline]
__x64_sys_close+0x7e/0x110 fs/open.c:1496
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f116556dad7
Code: 48 89 fa 4c 89 df e8 48 1f 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffe7ccdb7c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000055557d671400 RCX: 00007f116556dad7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe7ccdb860
R13: 0000000000025768 R14: 00007ffe7ccdb82c R15: 00007ffe7ccdb840
</TASK>
* Struck through repros no longer work on HEAD.