BUG: unable to handle kernel paging request in set_link_state

Status: upstream: reported C repro on 2026/07/24 22:28
Reported-by: syzbot+dd6dbf1b89f9af46cb13@syzkaller.appspotmail.com
First crash: 13d, last: 17h31m
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in set_link_state (2) usb prio:low 19 syz, C 688 16m 10d 0/29 closed as dup on 2026/07/29 12:31
android-6-1 general protection fault in set_link_state 2 46 5h55m 14d 0/2 premoderation: reported on 2026/07/24 17:03
android-6-12 general protection fault in set_link_state 2 syz 287 35m 13d 0/1 premoderation: reported syz repro on 2026/07/24 19:03
android-5-15 general protection fault in set_link_state 2 syz 47 7h17m 13d 0/2 premoderation: reported syz repro on 2026/07/25 11:11
linux-5.15 general protection fault in set_link_state 2 syz, C 12 8h03m 12d 0/3 upstream: reported C repro on 2026/07/25 19:33
upstream general protection fault in set_link_state usb 2 1 225d 221d 0/29 auto-obsoleted due to no activity on 2026/03/25 06:13
android-5-10 general protection fault in set_link_state 2 syz 201 4h29m 14d 0/2 premoderation: reported syz repro on 2026/07/24 13:19
linux-6.6 general protection fault in set_link_state 2 6 6d09h 13d 0/2 upstream: reported on 2026/07/25 01:05

Sample crash report:
Unable to handle kernel paging request at virtual address dfff800000000000
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
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
[dfff800000000000] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4510 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 824000c5 (Nzcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : set_link_state+0x38/0xf38 drivers/usb/gadget/udc/dummy_hcd.c:435
lr : set_link_state+0x34/0xf38 drivers/usb/gadget/udc/dummy_hcd.c:434
sp : ffff800021737520
x29: ffff800021737570 x28: 1fffe000198a7a84 x27: dfff800000000000
x26: 1fffe0001a3cb189 x25: ffff80000dceb9e4 x24: dfff800000000000
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000d1e5924a
x20: 0000000000000000 x19: 0000000000000000 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082f2840 x15: 000000000004ffff
x14: ffff7000042e6ea0 x13: 1ffff000042e6ea0 x12: 0000000000000004
x11: ff0080000dcec254 x10: 0000000000000000 x9 : ffff80000dcec254
x8 : 0000000000000000 x7 : ffff80000dceba78 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff8000082f2968
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 set_link_state+0x38/0xf38 drivers/usb/gadget/udc/dummy_hcd.c:435
 dummy_pullup+0xd8/0x12c drivers/usb/gadget/udc/dummy_hcd.c:914
 usb_gadget_disconnect_locked+0xf8/0x54c drivers/usb/gadget/udc/core.c:782
 gadget_unbind_driver+0xa0/0x35c drivers/usb/gadget/udc/core.c:1696
 device_remove drivers/base/dd.c:547 [inline]
 __device_release_driver drivers/base/dd.c:1279 [inline]
 device_release_driver_internal+0x3d4/0x6e4 drivers/base/dd.c:1305
 driver_detach+0x1e8/0x2ac drivers/base/dd.c:1368
 bus_remove_driver+0x120/0x240 drivers/base/bus.c:679
 driver_unregister+0x78/0xac drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1762
 raw_release+0xc4/0x294 drivers/usb/gadget/legacy/raw_gadget.c:416
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x54c/0x19ac kernel/exit.c:881
 do_group_exit+0x198/0x238 kernel/exit.c:1024
 get_signal+0x11f4/0x133c kernel/signal.c:2872
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x364/0x2c84 arch/arm64/kernel/signal.c:1148
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: aa0003f4 f2fbfffb 969f1b84 d343fe88 (387b6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa0003f4 	mov	x20, x0
   4:	f2fbfffb 	movk	x27, #0xdfff, lsl #48
   8:	969f1b84 	bl	0xfffffffffa7c6e18
   c:	d343fe88 	lsr	x8, x20, #3
* 10:	387b6908 	ldrb	w8, [x8, x27] <-- trapping instruction

Crashes (19):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/25 16:56 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/07/25 15:41 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/07/25 11:39 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/08/07 00:16 linux-6.1.y 03f3a99e8e93 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/08/06 12:03 linux-6.1.y fb28aa725e05 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/08/06 12:02 linux-6.1.y fb28aa725e05 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/08/04 12:25 linux-6.1.y fb28aa725e05 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/08/04 04:04 linux-6.1.y fb28aa725e05 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/08/03 17:16 linux-6.1.y fb28aa725e05 6b7c9f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in set_link_state
2026/07/24 22:28 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 set_link_state
2026/08/06 00:52 linux-6.1.y fb28aa725e05 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
2026/08/01 08:18 linux-6.1.y fb28aa725e05 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
2026/07/30 19:39 linux-6.1.y fb28aa725e05 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
2026/07/30 14:19 linux-6.1.y fb28aa725e05 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
2026/07/29 11:40 linux-6.1.y dc5c83b7f5f8 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
2026/07/28 02:45 linux-6.1.y dc5c83b7f5f8 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
2026/07/27 19:47 linux-6.1.y dc5c83b7f5f8 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
2026/07/27 19:47 linux-6.1.y dc5c83b7f5f8 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
2026/07/25 15:54 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in set_link_state
* Struck through repros no longer work on HEAD.