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From: Tj <tj.iam.tj@proton.me>
Newsgroups: linux.debian.bugs.dist,linux.debian.kernel
Subject: Bug#1128861: Regression: Missing check in nfsd_permission() causes -ENOLCK No locks available
Date: Tue, 24 Feb 2026 14:00:02 +0100
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Follow-up with results of adding dump_stack() to nfsd_permission()=20
revealing the paths that trigger the issue.

[=C2=A0 133.185579] Call Trace:
[=C2=A0 133.185580]=C2=A0 <TASK>
[=C2=A0 133.185580]=C2=A0 dump_stack_lvl+0x64/0x80
[=C2=A0 133.185582]=C2=A0 nfsd_permission+0x20/0x100 [nfsd]
[=C2=A0 133.185612]=C2=A0 nfsd_access+0xc8/0x140 [nfsd]
[=C2=A0 133.185639]=C2=A0 nfsd4_proc_compound+0x350/0x670 [nfsd]
[=C2=A0 133.185670]=C2=A0 nfsd_dispatch+0x100/0x220 [nfsd]
[=C2=A0 133.185698]=C2=A0 svc_process_common+0x314/0x700 [sunrpc]
[=C2=A0 133.185733]=C2=A0 ? __pfx_nfsd_dispatch+0x10/0x10 [nfsd]
[=C2=A0 133.185762]=C2=A0 svc_process+0x131/0x1c0 [sunrpc]
[=C2=A0 133.185795]=C2=A0 svc_recv+0x80a/0x9e0 [sunrpc]
[=C2=A0 133.185827]=C2=A0 ? __pfx_nfsd+0x10/0x10 [nfsd]
[=C2=A0 133.185856]=C2=A0 nfsd+0xa3/0x100 [nfsd]
[=C2=A0 133.185882]=C2=A0 kthread+0xd2/0x100
[=C2=A0 133.185884]=C2=A0 ? __pfx_kthread+0x10/0x10
[=C2=A0 133.185885]=C2=A0 ret_from_fork+0x34/0x50
[=C2=A0 133.185886]=C2=A0 ? __pfx_kthread+0x10/0x10
[=C2=A0 133.185887]=C2=A0 ret_from_fork_asm+0x1a/0x30
[=C2=A0 133.185890]=C2=A0 </TASK>

[=C2=A0 144.020165] Call Trace:
[=C2=A0 144.020165]=C2=A0 <TASK>
[=C2=A0 144.020166]=C2=A0 dump_stack_lvl+0x64/0x80
[=C2=A0 144.020168]=C2=A0 nfsd_permission+0x20/0x100 [nfsd]
[=C2=A0 144.020201]=C2=A0 nfsd_access+0xc8/0x140 [nfsd]
[=C2=A0 144.020228]=C2=A0 nfsd3_proc_access+0x6c/0x110 [nfsd]
[=C2=A0 144.020257]=C2=A0 nfsd_dispatch+0x100/0x220 [nfsd]
[=C2=A0 144.020286]=C2=A0 svc_process_common+0x314/0x700 [sunrpc]
[=C2=A0 144.020321]=C2=A0 ? __pfx_nfsd_dispatch+0x10/0x10 [nfsd]
[=C2=A0 144.020350]=C2=A0 svc_process+0x131/0x1c0 [sunrpc]
[=C2=A0 144.020383]=C2=A0 svc_recv+0x80a/0x9e0 [sunrpc]
[=C2=A0 144.020415]=C2=A0 ? __pfx_nfsd+0x10/0x10 [nfsd]
[=C2=A0 144.020445]=C2=A0 nfsd+0xa3/0x100 [nfsd]
[=C2=A0 144.020471]=C2=A0 kthread+0xd2/0x100
[=C2=A0 144.020472]=C2=A0 ? __pfx_kthread+0x10/0x10
[=C2=A0 144.020473]=C2=A0 ret_from_fork+0x34/0x50
[=C2=A0 144.020475]=C2=A0 ? __pfx_kthread+0x10/0x10
[=C2=A0 144.020476]=C2=A0 ret_from_fork_asm+0x1a/0x30
[=C2=A0 144.020478]=C2=A0 </TASK>