NFSD: attempt to initialize umh client tracking in a container ignored.
NFSD: attempt to initialize legacy client tracking in a container ignored.
NFSD: Unable to initialize client recovery tracking! (-22)
NFSD: starting 10-second grace period (net f00005c9)
------------[ cut here ]------------
kernel BUG at net/sunrpc/svc.c:578!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4834 Comm: syz.6.78 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 : ffff8000214a78f0
x29: ffff8000214a78f0 x28: dfff800000000000 x27: ffff0000f47d02c0
x26: ffff0000f47d0228 x25: ffff0000f47d0000 x24: 00000000fffffffc
x23: 0000000000000001 x22: dfff800000000000 x21: ffff0000f6311c00
x20: ffff0000f6311c68 x19: ffff0000f6311c50 x18: 1fffe00033e7697e
x17: 0000000000000000 x16: ffff8000082dd248 x15: 0000000000000000
x14: 0000000000000001 x13: 1fffe00033e728f0 x12: 0000000000080000
x11: 000000000005fb4e x10: ffff800021a3b000 x9 : ffff800010f0bf9c
x8 : 000000000005fb4f 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]
 nfsd_svc+0x63c/0x948 fs/nfsd/nfssvc.c:811
 write_threads+0x2b4/0x310 fs/nfsd/nfsctl.c:424
 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 ]---