BUG: unable to handle kernel paging request in dummy_queue

Status: upstream: reported on 2026/07/24 22:29
Reported-by: syzbot+6b46673c8ec480a9c2c2@syzkaller.appspotmail.com
First crash: 21d, last: 12h28m
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in dummy_queue usb prio:low 10 332 20m 18d 0/29 upstream: reported on 2026/07/28 13:42
linux-5.15 general protection fault in dummy_queue 2 3 3d02h 9d00h 0/3 upstream: reported on 2026/08/06 16:53
linux-6.6 general protection fault in dummy_queue 2 11 3d19h 21d 0/2 upstream: reported on 2026/07/25 01:05
android-5-10 general protection fault in dummy_queue 2 18 7d14h 22d 0/2 premoderation: reported on 2026/07/24 13:21
android-6-1 general protection fault in dummy_queue 2 3 9h34m 21d 0/2 premoderation: reported on 2026/07/24 18:37
android-6-12 general protection fault in dummy_queue 2 12 4d18h 19d 0/1 premoderation: reported on 2026/07/27 14:26
android-5-15 general protection fault in dummy_queue 2 8 4d18h 21d 0/2 premoderation: reported on 2026/07/25 09:31

Sample crash report:
Unable to handle kernel paging request at virtual address dfff80000000000a
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff80000000000a] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 79 Comm: kworker/0:1H Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Workqueue: events_highpri f_midi_in_work
pstate: 824000c5 (Nzcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : dummy_queue+0x16c/0x700 drivers/usb/gadget/udc/dummy_hcd.c:717
lr : gadget_to_dummy_hcd drivers/usb/gadget/udc/dummy_hcd.c:316 [inline]
lr : dummy_queue+0x138/0x700 drivers/usb/gadget/udc/dummy_hcd.c:716
sp : ffff80001fa778c0
x29: ffff80001fa778f0 x28: 1fffe0001a35301b x27: ffff0000d1a98c00
x26: ffff0000e5c50800 x25: dfff800000000000 x24: ffff0000d1a980d8
x23: dfff800000000000 x22: 1fffe0001cb8a100 x21: 0000000000000050
x20: ffff0000d1a980e0 x19: ffff0000e5c50810 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082f2d3c x15: 0000000000000000
x14: 0000000000000001 x13: 1fffe000196fa6c6 x12: 0000000000000000
x11: ff0080000dcee100 x10: 0000000000000000 x9 : 0000000000000658
x8 : 000000000000000a x7 : ffff80000f9d8b70 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff8000082f2e50
x2 : 0000000000000a20 x1 : 0000000000000003 x0 : 0000000000000005
Call trace:
 dummy_queue+0x16c/0x700 drivers/usb/gadget/udc/dummy_hcd.c:717
 usb_ep_queue+0xe4/0x494 drivers/usb/gadget/udc/core.c:305
 f_midi_do_transmit drivers/usb/gadget/function/f_midi.c:658 [inline]
 f_midi_transmit drivers/usb/gadget/function/f_midi.c:686 [inline]
 f_midi_in_work+0x1100/0x1648 drivers/usb/gadget/function/f_midi.c:706
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: 96b01b31 f94002a8 91014115 d343fea8 (38f96908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	96b01b31 	bl	0xfffffffffac06cc4
   4:	f94002a8 	ldr	x8, [x21]
   8:	91014115 	add	x21, x8, #0x50
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	38f96908 	ldrsb	w8, [x8, x25] <-- trapping instruction

Crashes (25):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/25 13:03 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in dummy_queue
2026/07/24 22:29 linux-6.1.y dc5c83b7f5f8 dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in dummy_queue
2026/08/15 04:51 linux-6.1.y e4f7d8be268e 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:35 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:34 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:31 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:31 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:28 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:28 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:28 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:23 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/12 01:17 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 16:50 linux-6.1.y e4f7d8be268e 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 04:04 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 03:59 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 03:59 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 03:55 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 03:53 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 03:52 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 03:52 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 03:51 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/11 03:51 linux-6.1.y e4f7d8be268e 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/07 15:43 linux-6.1.y e4f7d8be268e e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/07 15:43 linux-6.1.y e4f7d8be268e e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
2026/08/07 00:46 linux-6.1.y 03f3a99e8e93 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in dummy_queue
* Struck through repros no longer work on HEAD.