BUG: stack guard page was hit in nfsctl_transaction_write

Status: upstream: reported C repro on 2026/08/15 15:31
Subsystems: net nfs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+54cdc566f64abf51b7f1@syzkaller.appspotmail.com
First crash: 20d, last: 3d03h
▶ ▼ ✨ AI Jobs (5)
ID Workflow Result Correct Bug Created Started Finished Revision
0e249816 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ BUG: stack guard page was hit in nfsctl_transaction_write 2026/08/31 01:27 2026/08/31 01:27 2026/08/31 02:10 2f52988a
28a83b25 assessment-security 💥 BUG: stack guard page was hit in nfsctl_transaction_write 2026/08/22 01:09 2026/08/22 01:09 2026/08/22 01:09 1e72964b
ffde3ab9 assessment-security 💥 BUG: stack guard page was hit in nfsctl_transaction_write 2026/08/17 03:51 2026/08/17 03:51 2026/08/17 03:51 746171ee
29326c3a assessment-security 💥 BUG: stack guard page was hit in nfsctl_transaction_write 2026/08/14 00:48 2026/08/14 00:48 2026/08/14 00:48 0165196a
759a7819 assessment-security 💥 BUG: stack guard page was hit in nfsctl_transaction_write 2026/08/12 02:39 2026/08/12 02:39 2026/08/12 02:39 f8d35649
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH v1] SUNRPC: Reject a socket that already has an svc_sock attached 2 (2) 2026/08/17 13:06
[syzbot] [net?] [nfs?] BUG: stack guard page was hit in nfsctl_transaction_write 0 (1) 2026/08/15 15:31
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/08/25 15:27 14m retest repro upstream report job log log

Sample crash report:
BUG: TASK stack guard page was hit at ffffc90004947ff8 (stack is ffffc90004948000..ffffc90004950000)
Oops: stack guard page: 0000 [#1] SMP KASAN NOPTI
CPU: 3 UID: 0 PID: 5917 Comm: syz.0.18 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
RIP: 0010:check_preemption_disabled+0x3/0xe0 lib/smp_processor_id.c:13
Code: 65 8b 05 c4 d9 bc 08 85 c0 74 04 90 0f 0b 90 e9 53 fc ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 54 55 <53> 48 83 ec 08 65 8b 15 89 97 bc 08 65 8b 2d 92 97 bc 08 85 d2 74
RSP: 0018:ffffc90004948000 EFLAGS: 00010283
RAX: 0000000000000000 RBX: ffff888023aaf700 RCX: 0000000000000000
RDX: ffff88802c33a580 RSI: ffffffff8c620c00 RDI: ffffffff8c620c40
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888026ed1000
R13: ffff888049077358 R14: ffff888026ed1038 R15: ffff888023aaf700
FS:  000055557f8ff500(0000) GS:ffff8880d5e64000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90004947ff8 CR3: 00000000223e8000 CR4: 0000000000352ef0
Call Trace:
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 rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
 rcu_is_watching+0x13/0xc0 kernel/rcu/tree.c:753
 trace_svcsock_write_space include/trace/events/sunrpc.h:2317 [inline]
 svc_write_space+0x223/0x2b0 net/sunrpc/svcsock.c:429
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 svc_write_space+0xe6/0x2b0 net/sunrpc/svcsock.c:430
 svc_write_space+0xe6/0x2b0 net/sunrpc/svcsock.c:430
 svc_write_space+0xe6/0x2b0 net/sunrpc/svcsock.c:430
 svc_write_space+0xe6/0x2b0 net/sunrpc/svcsock.c:430
 svc_write_space+0xe6/0x2b0 net/sunrpc/svcsock.c:430
 svc_write_space+0xe6/0x2b0 net/sunrpc/svcsock.c:430
 svc_sock_setbufsize+0x18d/0x220 net/sunrpc/svcsock.c:386
 svc_udp_init net/sunrpc/svcsock.c:854 [inline]
 svc_setup_socket+0xb2f/0x1090 net/sunrpc/svcsock.c:1498
 svc_addsock+0x2fd/0x760 net/sunrpc/svcsock.c:1547
 __write_ports_addfd fs/nfsd/nfsctl.c:749 [inline]
 __write_ports fs/nfsd/nfsctl.c:812 [inline]
 write_ports+0xa5b/0xcc0 fs/nfsd/nfsctl.c:868
 nfsctl_transaction_write+0x106/0x1a0 fs/nfsd/nfsctl.c:114
 vfs_write+0x2aa/0x1050 fs/read_write.c:685
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbf2f79e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd81ef3768 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbf2fa25fa0 RCX: 00007fbf2f79e159
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000006
RBP: 00007fbf2f835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbf2fa25fac R14: 00007fbf2fa25fa0 R15: 00007fbf2fa25fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:check_preemption_disabled+0x3/0xe0 lib/smp_processor_id.c:13
Code: 65 8b 05 c4 d9 bc 08 85 c0 74 04 90 0f 0b 90 e9 53 fc ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 54 55 <53> 48 83 ec 08 65 8b 15 89 97 bc 08 65 8b 2d 92 97 bc 08 85 d2 74
RSP: 0018:ffffc90004948000 EFLAGS: 00010283
RAX: 0000000000000000 RBX: ffff888023aaf700 RCX: 0000000000000000
RDX: ffff88802c33a580 RSI: ffffffff8c620c00 RDI: ffffffff8c620c40
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888026ed1000
R13: ffff888049077358 R14: ffff888026ed1038 R15: ffff888023aaf700
FS:  000055557f8ff500(0000) GS:ffff8880d5e64000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90004947ff8 CR3: 00000000223e8000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	65 8b 05 c4 d9 bc 08 	mov    %gs:0x8bcd9c4(%rip),%eax        # 0x8bcd9cb
   7:	85 c0                	test   %eax,%eax
   9:	74 04                	je     0xf
   b:	90                   	nop
   c:	0f 0b                	ud2
   e:	90                   	nop
   f:	e9 53 fc ff ff       	jmp    0xfffffc67
  14:	0f 1f 00             	nopl   (%rax)
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	90                   	nop
  23:	90                   	nop
  24:	90                   	nop
  25:	90                   	nop
  26:	90                   	nop
  27:	41 54                	push   %r12
  29:	55                   	push   %rbp
* 2a:	53                   	push   %rbx <-- trapping instruction
  2b:	48 83 ec 08          	sub    $0x8,%rsp
  2f:	65 8b 15 89 97 bc 08 	mov    %gs:0x8bc9789(%rip),%edx        # 0x8bc97bf
  36:	65 8b 2d 92 97 bc 08 	mov    %gs:0x8bc9792(%rip),%ebp        # 0x8bc97cf
  3d:	85 d2                	test   %edx,%edx
  3f:	74                   	.byte 0x74

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/29 08:49 upstream cf72cbb39da8 2f52988a .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream BUG: stack guard page was hit in nfsctl_transaction_write
2026/08/11 15:20 upstream d58772d8520c 557a89d3 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 BUG: stack guard page was hit in nfsctl_transaction_write
* Struck through repros no longer work on HEAD.