* [syzbot] [usb?] BUG: unable to handle kernel paging request in usb_driver_release_interface
@ 2026-10-07 12:00 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-10-07 12:00 UTC (permalink / raw)
To: dakr, driver-core, gregkh, linux-kernel, linux-usb, rafael,
syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 602042bf29f6 Merge tag 'wq-for-7.3-rc6-fixes' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=155ae00d580000
kernel config: https://syzkaller.appspot.com/x/.config?x=929e4854a828f434
dashboard link: https://syzkaller.appspot.com/bug?extid=863936f50214e843ae0c
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10bd6715580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14ae21c9580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-602042bf.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c804d2e9b640/vmlinux-602042bf.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d6cd162ae59e/bzImage-602042bf.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+863936f50214e843ae0c@syzkaller.appspotmail.com
wwan wwan1: port wwan1mbim0 disconnected
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: usb_hub_wq hub_event
RIP: 0010:klist_put+0x4d/0x1d0 lib/klist.c:212
Code: c1 ea 03 80 3c 02 00 0f 85 74 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 43 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 cc ef 0c
RSP: 0018:ffffc900000c7450 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888035673c80 RCX: 0000000000000000
RDX: 000000000000000b RSI: ffffffff8bc8e645 RDI: 0000000000000058
RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff224ec84
R10: ffffffff91276423 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff912763e0 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880d5b4e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcc2839000 CR3: 000000003938c000 CR4: 0000000000352ef0
Call Trace:
<TASK>
klist_del lib/klist.c:230 [inline]
klist_remove+0x14c/0x2e0 lib/klist.c:249
__device_release_driver drivers/base/dd.c:1357 [inline]
device_release_driver_internal+0x4fb/0x620 drivers/base/dd.c:1372
usb_driver_release_interface+0x10e/0x190 drivers/usb/core/driver.c:643
cdc_ncm_unbind+0x2ac/0x350 drivers/net/usb/cdc_ncm.c:1019
usbnet_disconnect+0x1e2/0x300 drivers/net/usb/usbnet.c:1692
usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:461
device_remove drivers/base/dd.c:618 [inline]
device_remove+0x12a/0x180 drivers/base/dd.c:610
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3965
usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1484
usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2355
hub_port_connect drivers/usb/core/hub.c:5425 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5725 [inline]
port_event drivers/usb/core/hub.c:5889 [inline]
hub_event+0x1bb1/0x4420 drivers/usb/core/hub.c:5971
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:klist_put+0x4d/0x1d0 lib/klist.c:212
Code: c1 ea 03 80 3c 02 00 0f 85 74 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 43 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 cc ef 0c
RSP: 0018:ffffc900000c7450 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888035673c80 RCX: 0000000000000000
RDX: 000000000000000b RSI: ffffffff8bc8e645 RDI: 0000000000000058
RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff224ec84
R10: ffffffff91276423 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff912763e0 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880d5b4e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557a2d0a28 CR3: 000000002c457000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: c1 ea 03 shr $0x3,%edx
3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
7: 0f 85 74 01 00 00 jne 0x181
d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
14: fc ff df
17: 4c 8b 23 mov (%rbx),%r12
1a: 49 83 e4 fe and $0xfffffffffffffffe,%r12
1e: 49 8d 7c 24 58 lea 0x58(%r12),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 43 01 00 00 jne 0x177
34: 4c 89 e7 mov %r12,%rdi
37: 4d 8b 74 24 58 mov 0x58(%r12),%r14
3c: e8 .byte 0xe8
3d: cc int3
3e: ef out %eax,(%dx)
3f: 0c .byte 0xc
---
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2026-10-07 12:00 [syzbot] [usb?] BUG: unable to handle kernel paging request in usb_driver_release_interface syzbot
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