[v6.1] kernel BUG in svc_destroy
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syzbot
Jul 27, 2026, 2:59:28 AM (12 days ago) Jul 27
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: dc5c83b7f5f8 Linux 6.1.178
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11df11b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=872c04466179833f
dashboard link: https://syzkaller.appspot.com/bug?extid=98c650a118a7e9f4b9ac
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/96393e4697a3/disk-dc5c83b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0d4afce44fab/vmlinux-dc5c83b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4787e310d875/Image-dc5c83b7.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+98c650...@syzkaller.appspotmail.com
------------[ cut here ]------------
kernel BUG at net/sunrpc/svc.c:578!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4413 Comm: syz.2.6 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 : ffff8000211f7930
x29: ffff8000211f7930 x28: 1fffe00019ff16df x27: ffff0000d6ee5400
x26: dfff800000000000 x25: ffff70000423ef2c x24: ffff8000211f7960
x23: ffff0000d463f8c0 x22: dfff800000000000 x21: 0000000000000001
x20: ffff0000f688c868 x19: ffff0000f688c850 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082dd244 x15: 000000000004ffff
x14: 0000000000000001 x13: 1fffe00033e728f0 x12: 0000000000080000
x11: 00000000000237da x10: ffff80002978c000 x9 : ffff800010f0c48c
x8 : 00000000000237db x7 : ffff8000083b9688 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 ]---
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: dc5c83b7f5f8 Linux 6.1.178
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11df11b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=872c04466179833f
dashboard link: https://syzkaller.appspot.com/bug?extid=98c650a118a7e9f4b9ac
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/96393e4697a3/disk-dc5c83b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0d4afce44fab/vmlinux-dc5c83b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4787e310d875/Image-dc5c83b7.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+98c650...@syzkaller.appspotmail.com
------------[ cut here ]------------
kernel BUG at net/sunrpc/svc.c:578!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4413 Comm: syz.2.6 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 : ffff8000211f7930
x29: ffff8000211f7930 x28: 1fffe00019ff16df x27: ffff0000d6ee5400
x26: dfff800000000000 x25: ffff70000423ef2c x24: ffff8000211f7960
x23: ffff0000d463f8c0 x22: dfff800000000000 x21: 0000000000000001
x20: ffff0000f688c868 x19: ffff0000f688c850 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082dd244 x15: 000000000004ffff
x14: 0000000000000001 x13: 1fffe00033e728f0 x12: 0000000000080000
x11: 00000000000237da x10: ffff80002978c000 x9 : ffff800010f0c48c
x8 : 00000000000237db x7 : ffff8000083b9688 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 ]---
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Jul 27, 2026, 4:26:36 AM (12 days ago) Jul 27
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: dc5c83b7f5f8 Linux 6.1.178
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16c96499580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1775e6b9580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/96393e4697a3/disk-dc5c83b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0d4afce44fab/vmlinux-dc5c83b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4787e310d875/Image-dc5c83b7.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+98c650...@syzkaller.appspotmail.com
------------[ cut here ]------------
kernel BUG at net/sunrpc/svc.c:578!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4468 Comm: syz.0.18 Not tainted syzkaller #0
x29: ffff8000210c7930 x28: 1fffe0001ab1fe8f x27: ffff0000d3f43800
x26: dfff800000000000 x25: ffff700004218f2c x24: ffff8000210c7960
x23: ffff0000cbac4280 x22: dfff800000000000 x21: 0000000000000001
x20: ffff0000cc9be068 x19: ffff0000cc9be050 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082dd244 x15: 000000000004ffff
x14: 0000000000000001 x13: 1fffe00033e728f0 x12: 0000000000000000
x11: ff00800010f0c48c x10: 0000000000000000 x9 : ffff800010f0c48c
x8 : ffff0000d3f43800 x7 : ffff8000083b9688 x6 : 0000000000000000
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: dc5c83b7f5f8 Linux 6.1.178
git tree: linux-6.1.y
kernel config: https://syzkaller.appspot.com/x/.config?x=872c04466179833f
dashboard link: https://syzkaller.appspot.com/bug?extid=98c650a118a7e9f4b9ac
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1632f2ea580000
dashboard link: https://syzkaller.appspot.com/bug?extid=98c650a118a7e9f4b9ac
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1775e6b9580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/96393e4697a3/disk-dc5c83b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0d4afce44fab/vmlinux-dc5c83b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4787e310d875/Image-dc5c83b7.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+98c650...@syzkaller.appspotmail.com
------------[ cut here ]------------
kernel BUG at net/sunrpc/svc.c:578!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
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 : ffff8000210c7930
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
x29: ffff8000210c7930 x28: 1fffe0001ab1fe8f x27: ffff0000d3f43800
x26: dfff800000000000 x25: ffff700004218f2c x24: ffff8000210c7960
x23: ffff0000cbac4280 x22: dfff800000000000 x21: 0000000000000001
x20: ffff0000cc9be068 x19: ffff0000cc9be050 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082dd244 x15: 000000000004ffff
x14: 0000000000000001 x13: 1fffe00033e728f0 x12: 0000000000000000
x11: ff00800010f0c48c x10: 0000000000000000 x9 : ffff800010f0c48c
x8 : ffff0000d3f43800 x7 : ffff8000083b9688 x6 : 0000000000000000
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
syzbot
Jul 27, 2026, 4:30:32 AM (12 days ago) Jul 27
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 674f684f7c61 Linux 5.15.212
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15f5e6b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=081575878c5833a9922c
disk image: https://storage.googleapis.com/syzbot-assets/f55be2937b89/disk-674f684f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a19fb0ffc049/vmlinux-674f684f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/365d4529a007/bzImage-674f684f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+081575...@syzkaller.appspotmail.com
svc: failed to register lockdv1 RPC service (errno 111).
lockd_up: makesock failed, error=-111
------------[ cut here ]------------
kernel BUG at net/sunrpc/svc.c:572!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9629 Comm: syz.8.1041 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ff ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 66 43 c4 f8 e9 17 ff ff ff e8 ac 20 7f f8 <0f> 0b e8 a5 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc90002effaa0 EFLAGS: 00010246
RAX: ffffffff88f9e0d4 RBX: ffff8880629a4c50 RCX: 0000000000080000
RDX: ffffc9000e329000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000001 R08: ffffffff901ee2cf R09: 1ffffffff203dc59
R10: dffffc0000000000 R11: fffffbfff203dc5a R12: dffffc0000000000
R13: ffff888023464000 R14: ffff8880629a4c68 R15: ffff8880760b9a80
FS: 00007fdf626ce6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc8b1f82dac CR3: 0000000051c7f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
write_threads+0x2ea/0x350 fs/nfsd/nfsctl.c:426
nfsctl_transaction_write+0x105/0x150 fs/nfsd/nfsctl.c:114
vfs_write+0x304/0xd70 fs/read_write.c:592
ksys_write+0x153/0x260 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdf64496e99
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:00007fdf626ce028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fdf6471f090 RCX: 00007fdf64496e99
RDX: 0000000000000002 RSI: 00002000000002c0 RDI: 0000000000000003
RBP: 00007fdf6452ceaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdf6471f128 R14: 00007fdf6471f090 R15: 00007ffc43cb9208
</TASK>
Modules linked in:
---[ end trace 3e1e62612cac26d7 ]---
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ff ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 66 43 c4 f8 e9 17 ff ff ff e8 ac 20 7f f8 <0f> 0b e8 a5 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc90002effaa0 EFLAGS: 00010246
RAX: ffffffff88f9e0d4 RBX: ffff8880629a4c50 RCX: 0000000000080000
RDX: ffffc9000e329000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000001 R08: ffffffff901ee2cf R09: 1ffffffff203dc59
R10: dffffc0000000000 R11: fffffbfff203dc5a R12: dffffc0000000000
R13: ffff888023464000 R14: ffff8880629a4c68 R15: ffff8880760b9a80
FS: 00007fdf626ce6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f003aecf158 CR3: 0000000051c7f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
syzbot found the following issue on:
HEAD commit: 674f684f7c61 Linux 5.15.212
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15f5e6b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=081575878c5833a9922c
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f55be2937b89/disk-674f684f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a19fb0ffc049/vmlinux-674f684f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/365d4529a007/bzImage-674f684f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
svc: failed to register lockdv1 RPC service (errno 111).
lockd_up: makesock failed, error=-111
------------[ cut here ]------------
kernel BUG at net/sunrpc/svc.c:572!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9629 Comm: syz.8.1041 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ff ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 66 43 c4 f8 e9 17 ff ff ff e8 ac 20 7f f8 <0f> 0b e8 a5 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc90002effaa0 EFLAGS: 00010246
RAX: ffffffff88f9e0d4 RBX: ffff8880629a4c50 RCX: 0000000000080000
RDX: ffffc9000e329000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000001 R08: ffffffff901ee2cf R09: 1ffffffff203dc59
R10: dffffc0000000000 R11: fffffbfff203dc5a R12: dffffc0000000000
R13: ffff888023464000 R14: ffff8880629a4c68 R15: ffff8880760b9a80
FS: 00007fdf626ce6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc8b1f82dac CR3: 0000000051c7f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kref_put include/linux/kref.h:65 [inline]
svc_put include/linux/sunrpc/svc.h:123 [inline]
nfsd_svc+0x7cf/0x9e0 fs/nfsd/nfssvc.c:821
svc_put include/linux/sunrpc/svc.h:123 [inline]
write_threads+0x2ea/0x350 fs/nfsd/nfsctl.c:426
nfsctl_transaction_write+0x105/0x150 fs/nfsd/nfsctl.c:114
vfs_write+0x304/0xd70 fs/read_write.c:592
ksys_write+0x153/0x260 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdf64496e99
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:00007fdf626ce028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fdf6471f090 RCX: 00007fdf64496e99
RDX: 0000000000000002 RSI: 00002000000002c0 RDI: 0000000000000003
RBP: 00007fdf6452ceaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdf6471f128 R14: 00007fdf6471f090 R15: 00007ffc43cb9208
</TASK>
Modules linked in:
---[ end trace 3e1e62612cac26d7 ]---
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ff ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 66 43 c4 f8 e9 17 ff ff ff e8 ac 20 7f f8 <0f> 0b e8 a5 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc90002effaa0 EFLAGS: 00010246
RAX: ffffffff88f9e0d4 RBX: ffff8880629a4c50 RCX: 0000000000080000
RDX: ffffc9000e329000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000001 R08: ffffffff901ee2cf R09: 1ffffffff203dc59
R10: dffffc0000000000 R11: fffffbfff203dc5a R12: dffffc0000000000
R13: ffff888023464000 R14: ffff8880629a4c68 R15: ffff8880760b9a80
FS: 00007fdf626ce6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f003aecf158 CR3: 0000000051c7f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
syzbot
Jul 27, 2026, 5:18:30 AM (12 days ago) Jul 27
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 674f684f7c61 Linux 5.15.212
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=142d1632580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1623bfde580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f55be2937b89/disk-674f684f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a19fb0ffc049/vmlinux-674f684f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/365d4529a007/bzImage-674f684f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+081575...@syzkaller.appspotmail.com
RAX: ffffffff88f9e0d4 RBX: ffff88807a251450 RCX: ffff88802723bb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900011ffc78 R08: ffffffff901ee1ff R09: 1ffffffff203dc3f
R10: dffffc0000000000 R11: fffffbfff203dc40 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807a251468 R15: 0000000000000001
FS: 000055556b36e500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
__write_ports fs/nfsd/nfsctl.c:796 [inline]
write_ports+0xa26/0xb80 fs/nfsd/nfsctl.c:849
RAX: ffffffffffffffda RBX: 00007f579d5ccfa0 RCX: 00007f579d344e99
RDX: 0000000000000009 RSI: 0000200000000300 RDI: 0000000000000003
RBP: 00007f579d3daeaf R08: 0000000000000000 R09: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 58c8ad9b720f4e57 ]---
RAX: ffffffff88f9e0d4 RBX: ffff88807a251450 RCX: ffff88802723bb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900011ffc78 R08: ffffffff901ee1ff R09: 1ffffffff203dc3f
R10: dffffc0000000000 R11: fffffbfff203dc40 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807a251468 R15: 0000000000000001
FS: 000055556b36e500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
HEAD commit: 674f684f7c61 Linux 5.15.212
git tree: linux-5.15.y
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=081575878c5833a9922c
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f4b88e580000
dashboard link: https://syzkaller.appspot.com/bug?extid=081575878c5833a9922c
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1623bfde580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f55be2937b89/disk-674f684f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a19fb0ffc049/vmlinux-674f684f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/365d4529a007/bzImage-674f684f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+081575...@syzkaller.appspotmail.com
------------[ cut here ]------------
kernel BUG at net/sunrpc/svc.c:572!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4446 Comm: syz.0.18 Not tainted syzkaller #0
kernel BUG at net/sunrpc/svc.c:572!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ff ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 66 43 c4 f8 e9 17 ff ff ff e8 ac 20 7f f8 <0f> 0b e8 a5 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc900011ffad0 EFLAGS: 00010293
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ff ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 66 43 c4 f8 e9 17 ff ff ff e8 ac 20 7f f8 <0f> 0b e8 a5 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RAX: ffffffff88f9e0d4 RBX: ffff88807a251450 RCX: ffff88802723bb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900011ffc78 R08: ffffffff901ee1ff R09: 1ffffffff203dc3f
R10: dffffc0000000000 R11: fffffbfff203dc40 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807a251468 R15: 0000000000000001
FS: 000055556b36e500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007febc7314286 CR3: 000000001e81b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kref_put include/linux/kref.h:65 [inline]
svc_put include/linux/sunrpc/svc.h:123 [inline]
__write_ports_addxprt fs/nfsd/nfsctl.c:770 [inline]
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kref_put include/linux/kref.h:65 [inline]
svc_put include/linux/sunrpc/svc.h:123 [inline]
__write_ports fs/nfsd/nfsctl.c:796 [inline]
write_ports+0xa26/0xb80 fs/nfsd/nfsctl.c:849
nfsctl_transaction_write+0x105/0x150 fs/nfsd/nfsctl.c:114
vfs_write+0x304/0xd70 fs/read_write.c:592
ksys_write+0x153/0x260 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f579d344e99
vfs_write+0x304/0xd70 fs/read_write.c:592
ksys_write+0x153/0x260 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
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:00007ffeff98dd38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f579d5ccfa0 RCX: 00007f579d344e99
RDX: 0000000000000009 RSI: 0000200000000300 RDI: 0000000000000003
RBP: 00007f579d3daeaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f579d5ccfac R14: 00007f579d5ccfa0 R15: 00007f579d5ccfa0
</TASK>
Modules linked in:
---[ end trace 58c8ad9b720f4e57 ]---
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ff ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 66 43 c4 f8 e9 17 ff ff ff e8 ac 20 7f f8 <0f> 0b e8 a5 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc900011ffad0 EFLAGS: 00010293
Code: 5f 5d e9 ff ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 66 43 c4 f8 e9 17 ff ff ff e8 ac 20 7f f8 <0f> 0b e8 a5 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RAX: ffffffff88f9e0d4 RBX: ffff88807a251450 RCX: ffff88802723bb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900011ffc78 R08: ffffffff901ee1ff R09: 1ffffffff203dc3f
R10: dffffc0000000000 R11: fffffbfff203dc40 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807a251468 R15: 0000000000000001
FS: 000055556b36e500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f516e962286 CR3: 000000001e81b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
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