[v6.1] BUG: ADDR [#NUM] PREEMPT SMP

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: fb28aa725e05 Linux 6.1.180
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12db13b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=872c04466179833f
dashboard link: https://syzkaller.appspot.com/bug?extid=72a53adb76b5ce10cc7f
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d420eb944682/disk-fb28aa72.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/affae450ab23/vmlinux-fb28aa72.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b9e6919ed519/Image-fb28aa72.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+72a53a...@syzkaller.appspotmail.com

Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 5078 Comm: syz.2.256 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : svc_destroy+0x178/0x184 net/sunrpc/svc.c:578
lr : svc_destroy+0x178/0x184 net/sunrpc/svc.c:578
sp : ffff8000216d7930
x29: ffff8000216d7930 x28: 1fffe0001e24432f x27: ffff0000d439b800
x26: dfff800000000000 x25: ffff7000042daf2c x24: ffff8000216d7960
x23: ffff0000caa40a00 x22: dfff800000000000 x21: 0000000000000001
x20: ffff0000f3ed4868 x19: ffff0000f3ed4850 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082dd248 x15: 0000000000000002
x14: 0000000000000001 x13: 1fffe00033e728f0 x12: 0000000000080000
x11: 0000000000024199 x10: ffff80002663c000 x9 : ffff800010f0bf9c
x8 : 000000000002419a x7 : ffff8000083b968c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000006 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
svc_destroy+0x178/0x184 net/sunrpc/svc.c:578
kref_put include/linux/kref.h:65 [inline]
svc_put include/linux/sunrpc/svc.h:123 [inline]
__write_ports_addxprt fs/nfsd/nfsctl.c:768 [inline]
__write_ports fs/nfsd/nfsctl.c:794 [inline]
write_ports+0x850/0x9f0 fs/nfsd/nfsctl.c:847
nfsctl_transaction_write+0x114/0x164 fs/nfsd/nfsctl.c:114
vfs_write+0x2a8/0x7c8 fs/read_write.c:582
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: 91026260 97c3a73c 17ffffc8 97c3a6cd (d4210000)
---[ end trace 0000000000000000 ]---


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