WARNING in usb_ep_enable

Status: upstream: reported C repro on 2026/07/31 20:18
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+5bd412baa2c4211bdc7a@syzkaller.appspotmail.com
First crash: 97d, last: 11h38m
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2026/08/01 upstream (ToT) 02dc699f83d0 C [report] WARNING in usb_ep_enable
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-12 WARNING in usb_ep_enable origin:upstream -1 syz, C 209 13h14m 98d 0/1 premoderation: reported C repro on 2026/07/30 13:40
linux-6.1 WARNING in usb_ep_enable -1 syz, C 470 4h43m 96d 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 3662 54m 97d 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 217 10h56m 97d 0/2 upstream: reported C repro on 2026/07/31 21:09

Sample crash report:
------------[ cut here ]------------
usb_ep_enable: ep129 (ep1in-bulk) has maxpacket 0
WARNING: CPU: 1 PID: 4320 at drivers/usb/gadget/udc/core.c:108 usb_ep_enable+0x25f/0x440 drivers/usb/gadget/udc/core.c:107
Modules linked in:
CPU: 1 PID: 4320 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:usb_ep_enable+0x25f/0x440 drivers/usb/gadget/udc/core.c:107
Code: 49 8b 0e 48 c7 c0 e0 2d d5 8a 49 c7 c0 00 2e d5 8a 4c 0f 44 c0 48 c7 c7 a0 2d d5 8a 48 c7 c6 e7 0e e2 8b 89 ea e8 41 ee 80 03 <0f> 0b e9 e1 fe ff ff e8 c5 e7 42 fb 49 bc 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000dd0688 EFLAGS: 00010046
RAX: aa0c8bf69c977900 RBX: ffff888147c340e0 RCX: ffff88807a1e3b80
RDX: 0000000000000100 RSI: 0000000080000102 RDI: 0000000000000000
RBP: 0000000000000081 R08: ffff8880b8f2795b R09: 1ffff110171e4f2b
R10: dffffc0000000000 R11: ffffed10171e4f2c R12: dffffc0000000000
R13: ffff888147c3410d R14: ffff888147c340e8 R15: ffff88801fc838ba
FS:  000055558c74d500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f49906ea2f8 CR3: 000000002bac6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 hidg_set_alt+0x126/0xa00 drivers/usb/gadget/function/f_hid.c:822
 set_config+0x734/0xfa0 drivers/usb/gadget/composite.c:972
 composite_setup+0x1999/0x2b60 drivers/usb/gadget/composite.c:1878
 configfs_composite_setup+0xc3/0x100 drivers/usb/gadget/configfs.c:1492
 dummy_timer+0x1338/0x34a0 drivers/usb/gadget/udc/dummy_hcd.c:1944
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:stack_trace_consume_entry+0x3b/0x270 kernel/stacktrace.c:86
Code: 00 00 00 00 fc ff df 4c 8d 47 10 4c 89 c5 48 c1 ed 03 0f b6 44 15 00 84 c0 0f 85 04 01 00 00 44 8b 4f 10 4c 8d 77 08 4d 89 f5 <49> c1 ed 03 41 0f b6 44 15 00 84 c0 0f 85 1d 01 00 00 45 3b 0e 73
RSP: 0018:ffffc90002ffee78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90002ffef80 RCX: 0000000080000001
RDX: dffffc0000000000 RSI: ffffffff87de9b51 RDI: ffffc90002ffef80
RBP: 1ffff920005ffdf2 R08: ffffc90002ffef90 R09: 000000000000000a
R10: dffffc0000000000 R11: fffff520005ffde5 R12: ffff88807a1e3b80
R13: ffffc90002ffef88 R14: ffffc90002ffef88 R15: ffffc90002ffeec8
 arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522
 kmalloc_node include/linux/slab.h:625 [inline]
 kzalloc_node include/linux/slab.h:749 [inline]
 __get_vm_area_node+0x119/0x2d0 mm/vmalloc.c:2423
 __vmalloc_node_range+0xef/0x8b0 mm/vmalloc.c:3027
 __vmalloc_node mm/vmalloc.c:3087 [inline]
 vzalloc+0x75/0x80 mm/vmalloc.c:3157
 alloc_counters+0xcc/0x750 net/ipv4/netfilter/arp_tables.c:671
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:844 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1044 [inline]
 do_ip6t_get_ctl+0xa3e/0x1130 net/ipv6/netfilter/ip6_tables.c:1681
 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x43f/0x2390 net/ipv6/ipv6_sockglue.c:1492
 tcp_getsockopt+0x209/0x2530 net/ipv4/tcp.c:4323
 __sys_getsockopt+0x1b0/0x230 net/socket.c:2257
 __do_sys_getsockopt net/socket.c:2272 [inline]
 __se_sys_getsockopt net/socket.c:2269 [inline]
 __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2269
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4990496d2a
Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 d8 99 fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007fffc17a74c8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007fffc17a7550 RCX: 00007f4990496d2a
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007fffc17a74ec R09: 0000000000000000
R10: 00007fffc17a7550 R11: 0000000000000212 R12: 00007f49906ea900
R13: 00007fffc17a74ec R14: 0000000000000000 R15: 00007f49906eafc0
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	fc                   	cld
   5:	ff                   	lcall  (bad)
   6:	df 4c 8d 47          	fisttps 0x47(%rbp,%rcx,4)
   a:	10 4c 89 c5          	adc    %cl,-0x3b(%rcx,%rcx,4)
   e:	48 c1 ed 03          	shr    $0x3,%rbp
  12:	0f b6 44 15 00       	movzbl 0x0(%rbp,%rdx,1),%eax
  17:	84 c0                	test   %al,%al
  19:	0f 85 04 01 00 00    	jne    0x123
  1f:	44 8b 4f 10          	mov    0x10(%rdi),%r9d
  23:	4c 8d 77 08          	lea    0x8(%rdi),%r14
  27:	4d 89 f5             	mov    %r14,%r13
* 2a:	49 c1 ed 03          	shr    $0x3,%r13 <-- trapping instruction
  2e:	41 0f b6 44 15 00    	movzbl 0x0(%r13,%rdx,1),%eax
  34:	84 c0                	test   %al,%al
  36:	0f 85 1d 01 00 00    	jne    0x159
  3c:	45 3b 0e             	cmp    (%r14),%r9d
  3f:	73                   	.byte 0x73

Crashes (219):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/19 04:14 linux-5.15.y 792fbe1537d8 432c0077 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/19 02:18 linux-5.15.y 792fbe1537d8 432c0077 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/19 00:17 linux-5.15.y 792fbe1537d8 432c0077 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/18 21:46 linux-5.15.y 792fbe1537d8 432c0077 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/18 19:44 linux-5.15.y 792fbe1537d8 432c0077 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/18 17:35 linux-5.15.y 792fbe1537d8 432c0077 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/08/01 01:05 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/11/05 11:14 linux-5.15.y 700e62ea909a 2ee8459f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/11/02 16:07 linux-5.15.y 700e62ea909a 6969b601 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/11/02 15:06 linux-5.15.y 700e62ea909a 6969b601 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/11/01 11:01 linux-5.15.y 700e62ea909a 25a0ae84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/30 02:58 linux-5.15.y 792fbe1537d8 b498adee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/28 21:06 linux-5.15.y 792fbe1537d8 858db2ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/27 21:29 linux-5.15.y 792fbe1537d8 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/25 01:27 linux-5.15.y 792fbe1537d8 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/22 16:21 linux-5.15.y 792fbe1537d8 b55fad29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/21 13:20 linux-5.15.y 792fbe1537d8 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/21 10:47 linux-5.15.y 792fbe1537d8 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/20 16:01 linux-5.15.y 792fbe1537d8 df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/18 15:29 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/18 15:23 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/18 10:20 linux-5.15.y 792fbe1537d8 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/11 20:47 linux-5.15.y a051a4bf909f 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/10 08:51 linux-5.15.y a051a4bf909f 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/09 23:02 linux-5.15.y a051a4bf909f 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/09 12:57 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/09 09:37 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/09 09:37 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/09 00:07 linux-5.15.y a051a4bf909f b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/08 13:13 linux-5.15.y a051a4bf909f 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/07 20:58 linux-5.15.y a051a4bf909f 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/05 20:07 linux-5.15.y a051a4bf909f af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/03 19:34 linux-5.15.y a051a4bf909f 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/03 10:27 linux-5.15.y 0248c33e835e 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/10/03 03:22 linux-5.15.y 0248c33e835e 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/30 17:02 linux-5.15.y 0248c33e835e 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/29 23:57 linux-5.15.y 0248c33e835e 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/29 22:13 linux-5.15.y 0248c33e835e 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/27 14:18 linux-5.15.y 0248c33e835e a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/25 08:28 linux-5.15.y 0248c33e835e f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/24 11:19 linux-5.15.y 0248c33e835e 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/23 07:16 linux-5.15.y 0248c33e835e 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/23 04:39 linux-5.15.y 0248c33e835e 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/23 04:02 linux-5.15.y 0248c33e835e 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/23 01:44 linux-5.15.y 0248c33e835e 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/23 01:43 linux-5.15.y 0248c33e835e 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/22 10:47 linux-5.15.y 0248c33e835e e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/21 01:00 linux-5.15.y 0248c33e835e 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/20 18:52 linux-5.15.y 0248c33e835e 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/20 02:48 linux-5.15.y 0248c33e835e 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/18 11:42 linux-5.15.y 0248c33e835e 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/18 11:31 linux-5.15.y 0248c33e835e 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/18 06:32 linux-5.15.y 0248c33e835e 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/18 05:27 linux-5.15.y 0248c33e835e 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/18 02:55 linux-5.15.y 0248c33e835e 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/17 23:15 linux-5.15.y 0248c33e835e 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/09/10 17:49 linux-5.15.y 0996e0926f6b 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
2026/07/31 20:17 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in usb_ep_enable
* Struck through repros no longer work on HEAD.