syzbot
BUG: unable to handle kernel paging request in rebind_store
Status:
upstream: reported on 2026/08/05 04:55
Reported-by: syzbot+f05ec31888a56c27582b@syzkaller.appspotmail.com
First crash: 12h11m, last: 12h10m
Sample crash report:
Unable to handle kernel paging request at virtual address dfff80000000001d
KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef]
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
[dfff80000000001d] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 6334 Comm: syz.2.722 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 02400005 (nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : do_rebind drivers/usb/usbip/stub_main.c:206 [inline]
pc : rebind_store+0xb8/0x210 drivers/usb/usbip/stub_main.c:266
lr : spin_unlock include/linux/spinlock.h:391 [inline]
lr : put_busid_priv drivers/usb/usbip/stub_main.c:85 [inline]
lr : rebind_store+0x94/0x210 drivers/usb/usbip/stub_main.c:264
sp : ffff8000212579e0
x29: ffff8000212579e0 x28: ffff800021257b68 x27: 1fffe0001e9a5280
x26: ffff0000d2c4e740 x25: 1ffff000039308b2 x24: dfff800000000000
x23: dfff800000000000 x22: 00000000000000e8 x21: ffff80001c984590
x20: ffff0000f41ac300 x19: 0000000000000001 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082f2d40 x15: ffff8000184cd000
x14: 0000000000000001 x13: 1ffff000039308b4 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000000001 x9 : dfff800000000000
x8 : 000000000000001d x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff8000188370e8 x4 : 0000000000000008 x3 : ffff8000082f2e54
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000001
Call trace:
do_rebind drivers/usb/usbip/stub_main.c:206 [inline]
rebind_store+0xb8/0x210 drivers/usb/usbip/stub_main.c:266
drv_attr_store+0x80/0xa4 drivers/base/bus.c:77
sysfs_kf_write+0x1f8/0x274 fs/sysfs/file.c:140
kernfs_fop_write_iter+0x390/0x4b4 fs/kernfs/file.c:352
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x3c8/0x7c8 fs/read_write.c:584
ksys_write+0x12c/0x228 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__arm64_sys_write+0x7c/0x90 fs/read_write.c:646
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
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: 96a99159 f94002a8 9103a116 d343fec8 (38786908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 96a99159 bl 0xfffffffffaa64564
4: f94002a8 ldr x8, [x21]
8: 9103a116 add x22, x8, #0xe8
c: d343fec8 lsr x8, x22, #3
* 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction
* Struck through repros no longer work on HEAD.