WARNING in usb_ep_enable

Status: premoderation: reported C repro on 2026/07/30 13:40
Reported-by: syzbot+53eb788a470795ed13dd@syzkaller.appspotmail.com
First crash: 52d, last: 1d01h
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in usb_ep_enable origin:upstream -1 syz, C 93 3h16m 51d 0/3 upstream: reported C repro on 2026/07/31 20:18
linux-6.1 WARNING in usb_ep_enable -1 syz, C 157 4h21m 50d 0/3 upstream: reported C repro on 2026/08/01 09:05
upstream WARNING in usb_ep_enable prio:high usb -1 syz, C done 1269 now 51d 0/29 upstream: reported C repro on 2026/07/31 17:13
linux-6.6 WARNING in usb_ep_enable origin:upstream -1 syz, C 76 14h04m 51d 0/2 upstream: reported C repro on 2026/07/31 21:09

Sample crash report:
usb_ep_enable: ep129 (ep1in-bulk) has maxpacket 0
WARNING: CPU: 1 PID: 0 at drivers/usb/gadget/udc/core.c:125 usb_ep_enable+0x210/0x3c0 drivers/usb/gadget/udc/core.c:124
Modules linked in:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 55bf8b22bdada172f4c106b01602b1dfb2209583
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:usb_ep_enable+0x210/0x3c0 drivers/usb/gadget/udc/core.c:124
Code: 4d 00 48 c7 c0 e0 52 6d 86 49 c7 c0 00 53 6d 86 4c 0f 44 c0 48 c7 c7 a0 52 6d 86 48 c7 c6 d0 09 1d 87 44 89 f2 e8 10 c3 4b fd <0f> 0b e9 4c ff ff ff e8 d4 ea ce fd 49 bc 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000230878 EFLAGS: 00010046
RAX: 82f31f84b3411300 RBX: ffff8881057680b0 RCX: ffff888103668000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc900002308a0 R08: ffff8881f6f294d3 R09: 1ffff1103ede529a
R10: dffffc0000000000 R11: ffffed103ede529b R12: dffffc0000000000
R13: ffff8881057680b8 R14: 0000000000000081 R15: ffff88810b2a62ba
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005623e6868e20 CR3: 000000010cb58000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 hidg_set_alt+0x138/0xa70 drivers/usb/gadget/function/f_hid.c:1057
 set_config+0x812/0xd10 drivers/usb/gadget/composite.c:1021
 composite_setup+0x1885/0x32f0 drivers/usb/gadget/composite.c:1929
 configfs_composite_setup+0xc6/0x110 drivers/usb/gadget/configfs.c:1883
 dummy_timer+0x2eee/0x4900 drivers/usb/gadget/udc/dummy_hcd.c:1935
 __run_hrtimer kernel/time/hrtimer.c:1757 [inline]
 __hrtimer_run_queues+0x3ae/0x8e0 kernel/time/hrtimer.c:1821
 hrtimer_run_softirq+0x159/0x560 kernel/time/hrtimer.c:1838
 handle_softirqs+0x1aa/0x620 kernel/softirq.c:621
 __do_softirq kernel/softirq.c:659 [inline]
 invoke_softirq kernel/softirq.c:476 [inline]
 __irq_exit_rcu+0x47/0xb0 kernel/softirq.c:708
 irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x82/0x90 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:116
Code: cc cc cc cc cc cc cc b8 e3 9c fa c8 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 23 19 43 00 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c2
RAX: ffff8881f6f00000 RBX: ffff888103668000 RCX: ffffffff85a444fd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 00000000000119a4
RBP: ffffc900001a7e00 R08: ffff8881f6f395eb R09: 1ffff1103ede72bd
R10: dffffc0000000000 R11: ffffed103ede72be R12: 0000000000000000
R13: 1ffff110206cd000 R14: dffffc0000000000 R15: ffffffff87ecc068
 arch_safe_halt arch/x86/include/asm/paravirt.h:-1 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:754
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
 default_idle_call+0x3e/0x80 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:193 [inline]
 do_idle+0x2fc/0x570 kernel/sched/idle.c:346
 cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:445
 start_secondary+0x12e/0x140 arch/x86/kernel/smpboot.c:314
 common_startup_64+0x13b/0x157
 </TASK>
---[ end trace 0000000000000000 ]---
configfs-gadget.g1 gadget.0: Enable IN endpoint FAILED!
----------------
Code disassembly (best guess):
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	b8 e3 9c fa c8       	mov    $0xc8fa9ce3,%eax
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	f3 0f 1e fa          	endbr64
  1b:	66 90                	xchg   %ax,%ax
  1d:	0f 00 2d 23 19 43 00 	verw   0x431923(%rip)        # 0x431947
  24:	55                   	push   %rbp
  25:	48 89 e5             	mov    %rsp,%rbp
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	b8 00 00 00 00       	mov    $0x0,%eax
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Crashes (47):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/11 23:06 android16-6.12 42b03373f376 71790083 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/10 18:10 android16-6.12 309759bcbe6d 5d63f80b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/10 16:10 android16-6.12 309759bcbe6d 5d63f80b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/10 04:47 android16-6.12 309759bcbe6d 5d63f80b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/08 11:39 android16-6.12 b54741372957 5d63f80b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/08 06:19 android16-6.12 b54741372957 5d63f80b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/08 03:10 android16-6.12 b54741372957 e4ef95d6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/30 14:32 android16-6.12 f1c9c21d1c2f 2377cd3d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/20 02:30 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/19 20:50 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/19 15:10 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/19 15:05 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/19 15:05 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/19 07:31 android16-6.12 fb15c16e04b2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/19 02:26 android16-6.12 fb15c16e04b2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/18 12:55 android16-6.12 17176090d7cd 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/18 06:42 android16-6.12 17176090d7cd 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/18 00:45 android16-6.12 e79b240621d0 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/17 22:30 android16-6.12 e79b240621d0 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/17 21:26 android16-6.12 e79b240621d0 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/17 17:24 android16-6.12 e79b240621d0 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/17 15:56 android16-6.12 e79b240621d0 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/17 14:58 android16-6.12 e79b240621d0 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/17 14:47 android16-6.12 e79b240621d0 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/17 13:20 android16-6.12 e79b240621d0 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/09/17 13:19 android16-6.12 e79b240621d0 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/28 13:38 android16-6.12 3ebc81d80f95 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/28 13:38 android16-6.12 3ebc81d80f95 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/28 13:38 android16-6.12 3ebc81d80f95 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/07 14:14 android16-6.12 282da3f968e5 e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/06 11:39 android16-6.12 749a6f9d41aa cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/05 19:24 android16-6.12 1d5d2bee38d2 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/05 19:23 android16-6.12 1d5d2bee38d2 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/08/05 09:51 android16-6.12 f068f96e8cc3 52aa2820 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/31 09:56 android16-6.12 7d66c8550304 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/31 08:49 android16-6.12 7d66c8550304 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/31 03:23 android16-6.12 7d66c8550304 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/30 21:23 android16-6.12 f1c9c21d1c2f aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/30 18:12 android16-6.12 f1c9c21d1c2f aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/30 17:27 android16-6.12 f1c9c21d1c2f 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/30 13:41 android16-6.12 f1c9c21d1c2f 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/30 13:40 android16-6.12 f1c9c21d1c2f 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
2026/07/30 13:39 android16-6.12 f1c9c21d1c2f 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in usb_ep_enable
* Struck through repros no longer work on HEAD.