WARNING in cxacru_cm/usb_submit_urb

Status: upstream: reported on 2026/07/31 23:40
Reported-by: syzbot+2ce64338e36549d11d88@syzkaller.appspotmail.com
First crash: 1d09h, last: 1d08h
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in cxacru_cm/usb_submit_urb usb -1 syz, C error inconclusive 14 772d 2340d 26/29 fixed on 2024/07/09 19:14
upstream WARNING in cxacru_cm/usb_submit_urb (2) usb -1 syz, C 8 531d 541d 28/29 fixed on 2025/06/10 16:19
upstream WARNING in cxacru_cm/usb_submit_urb (3) usb prio:high -1 syz, C 25 3h56m 1d15h 0/29 upstream: reported C repro on 2026/07/31 17:14

Sample crash report:
cxacru 4-1:1.0: send of cm 0x84 failed (-104)
ATM dev 0: cxacru_atm_start: CHIP_ADSL_LINE_START returned -104
------------[ cut here ]------------
URB ffff88802fa60e00 submitted while active
WARNING: CPU: 1 PID: 4316 at drivers/usb/core/urb.c:379 usb_submit_urb+0xfb8/0x18d0 drivers/usb/core/urb.c:379
Modules linked in:
CPU: 1 PID: 4316 Comm: kworker/1:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_submit_urb+0xfb8/0x18d0 drivers/usb/core/urb.c:379
Code: 2e 8b 44 89 ea e8 49 d3 fd 03 e9 bb fb ff ff e8 de 18 57 fb c6 05 32 8d e1 07 01 48 c7 c7 40 e8 2e 8b 48 89 de e8 18 a3 22 fb <0f> 0b e9 be f0 ff ff e8 bc 18 57 fb eb 1f e8 b5 18 57 fb 44 8b 64
RSP: 0018:ffffc900042669f8 EFLAGS: 00010246
RAX: 2027fa20103ef300 RBX: ffff88802fa60e00 RCX: 0000000000100000
RDX: ffffc9001a87a000 RSI: 000000000001edd0 RDI: 000000000001edd1
RBP: ffffc90004266c70 R08: ffffc90004266687 R09: 1ffff9200084ccd0
R10: dffffc0000000000 R11: fffff5200084ccd1 R12: 0000000000000cc0
R13: 0000000000000000 R14: ffff88802fa60e08 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005bbb3000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 cxacru_cm+0x216/0x11c0 drivers/usb/atm/cxacru.c:631
 cxacru_cm_get_array drivers/usb/atm/cxacru.c:722 [inline]
 cxacru_poll_status+0x175/0x10c0 drivers/usb/atm/cxacru.c:828
 cxacru_atm_start+0x1ac/0x320 drivers/usb/atm/cxacru.c:814
 usbatm_atm_init+0x149/0x3a0 drivers/usb/atm/usbatm.c:927
 usbatm_usb_probe+0x15ba/0x1d20 drivers/usb/atm/usbatm.c:1177
 cxacru_usb_probe+0x179/0x220 drivers/usb/atm/cxacru.c:1370
 usb_probe_interface+0x5be/0xae0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x24a/0xb40 drivers/base/dd.c:638
 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834
 __device_attach_driver+0x2c6/0x510 drivers/base/dd.c:962
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429
 __device_attach+0x2a7/0x480 drivers/base/dd.c:1034
 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489
 device_add+0xbcf/0x1050 drivers/base/core.c:3712
 usb_set_configuration+0x19d5/0x2030 drivers/usb/core/message.c:2223
 usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238
 usb_probe_device+0x126/0x250 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x24a/0xb40 drivers/base/dd.c:638
 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834
 __device_attach_driver+0x2c6/0x510 drivers/base/dd.c:962
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429
 __device_attach+0x2a7/0x480 drivers/base/dd.c:1034
 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489
 device_add+0xbcf/0x1050 drivers/base/core.c:3712
 usb_new_device+0xa01/0x15e0 drivers/usb/core/hub.c:2659
 hub_port_connect drivers/usb/core/hub.c:5517 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5657 [inline]
 port_event drivers/usb/core/hub.c:5817 [inline]
 hub_event+0x2b2f/0x5200 drivers/usb/core/hub.c:5899
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/31 23:45 linux-6.1.y fb28aa725e05 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in cxacru_cm/usb_submit_urb
2026/07/31 23:42 linux-6.1.y fb28aa725e05 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in cxacru_cm/usb_submit_urb
2026/07/31 23:40 linux-6.1.y fb28aa725e05 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in cxacru_cm/usb_submit_urb
* Struck through repros no longer work on HEAD.