[v5.15] invalid opcode in svc_destroy
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syzbot
Aug 4, 2026, 2:23:25 PM (13 days ago) Aug 4
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 6e2fd6534337 Linux 5.15.213
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=120a4bb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=1130eee716b83e13170b
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/d7b46606b13d/disk-6e2fd653.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da120fdeb081/vmlinux-6e2fd653.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c2643457e3f/bzImage-6e2fd653.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1130ee...@syzkaller.appspotmail.com
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4299 Comm: syz.2.12 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ef ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 56 43 c4 f8 e9 17 ff ff ff e8 9c 20 7f f8 <0f> 0b e8 95 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc9000391faa0 EFLAGS: 00010283
RAX: ffffffff88f9dc14 RBX: ffff88805ef0b050 RCX: 0000000000080000
RDX: ffffc9000be61000 RSI: 0000000000040a9a RDI: 0000000000040a9b
RBP: 0000000000000001 R08: ffffffff901ee1df R09: 1ffffffff203dc3b
R10: dffffc0000000000 R11: fffffbfff203dc3c R12: dffffc0000000000
R13: ffff8880635dc000 R14: ffff88805ef0b068 R15: ffff88802bad1a80
FS: 00007f7b6c5616c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdfc2b27700 CR3: 0000000072ca9000 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
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: 0033:0x7f7b6e309019
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:00007f7b6c561028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7b6e590fa0 RCX: 00007f7b6e309019
RDX: 0000000000000002 RSI: 0000200000000300 RDI: 0000000000000005
RBP: 00007f7b6e3a000c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b6e591038 R14: 00007f7b6e590fa0 R15: 00007fff01331778
</TASK>
Modules linked in:
---[ end trace 709502c6e85fffaf ]---
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ef ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 56 43 c4 f8 e9 17 ff ff ff e8 9c 20 7f f8 <0f> 0b e8 95 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc9000391faa0 EFLAGS: 00010283
RAX: ffffffff88f9dc14 RBX: ffff88805ef0b050 RCX: 0000000000080000
RDX: ffffc9000be61000 RSI: 0000000000040a9a RDI: 0000000000040a9b
RBP: 0000000000000001 R08: ffffffff901ee1df R09: 1ffffffff203dc3b
R10: dffffc0000000000 R11: fffffbfff203dc3c R12: dffffc0000000000
R13: ffff8880635dc000 R14: ffff88805ef0b068 R15: ffff88802bad1a80
FS: 00007f7b6c5616c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556ac72a38 CR3: 0000000072ca9000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
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: 6e2fd6534337 Linux 5.15.213
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=120a4bb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=1130eee716b83e13170b
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/d7b46606b13d/disk-6e2fd653.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da120fdeb081/vmlinux-6e2fd653.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c2643457e3f/bzImage-6e2fd653.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1130ee...@syzkaller.appspotmail.com
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4299 Comm: syz.2.12 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ef ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 56 43 c4 f8 e9 17 ff ff ff e8 9c 20 7f f8 <0f> 0b e8 95 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc9000391faa0 EFLAGS: 00010283
RAX: ffffffff88f9dc14 RBX: ffff88805ef0b050 RCX: 0000000000080000
RDX: ffffc9000be61000 RSI: 0000000000040a9a RDI: 0000000000040a9b
RBP: 0000000000000001 R08: ffffffff901ee1df R09: 1ffffffff203dc3b
R10: dffffc0000000000 R11: fffffbfff203dc3c R12: dffffc0000000000
R13: ffff8880635dc000 R14: ffff88805ef0b068 R15: ffff88802bad1a80
FS: 00007f7b6c5616c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdfc2b27700 CR3: 0000000072ca9000 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
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: 0033:0x7f7b6e309019
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:00007f7b6c561028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7b6e590fa0 RCX: 00007f7b6e309019
RDX: 0000000000000002 RSI: 0000200000000300 RDI: 0000000000000005
RBP: 00007f7b6e3a000c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b6e591038 R14: 00007f7b6e590fa0 R15: 00007fff01331778
</TASK>
Modules linked in:
---[ end trace 709502c6e85fffaf ]---
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:572
Code: 5f 5d e9 ef ae c3 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 56 43 c4 f8 e9 17 ff ff ff e8 9c 20 7f f8 <0f> 0b e8 95 20 7f f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc9000391faa0 EFLAGS: 00010283
RAX: ffffffff88f9dc14 RBX: ffff88805ef0b050 RCX: 0000000000080000
RDX: ffffc9000be61000 RSI: 0000000000040a9a RDI: 0000000000040a9b
RBP: 0000000000000001 R08: ffffffff901ee1df R09: 1ffffffff203dc3b
R10: dffffc0000000000 R11: fffffbfff203dc3c R12: dffffc0000000000
R13: ffff8880635dc000 R14: ffff88805ef0b068 R15: ffff88802bad1a80
FS: 00007f7b6c5616c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556ac72a38 CR3: 0000000072ca9000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
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
Aug 4, 2026, 5:46:32 PM (13 days ago) Aug 4
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: fb28aa725e05 Linux 6.1.180
syzbot found the following issue on:
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11754bb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=31dfefc4a14efea3
dashboard link: https://syzkaller.appspot.com/bug?extid=296646976b4f68a00b74
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/9a6fe2a54d0f/disk-fb28aa72.raw.xz
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
vmlinux: https://storage.googleapis.com/syzbot-assets/742b23a1d931/vmlinux-fb28aa72.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b3f257c16d2e/bzImage-fb28aa72.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:578
Code: 5f 5d e9 ff bd 64 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 06 46 7d f8 e9 17 ff ff ff e8 4c 19 2c f8 <0f> 0b e8 45 19 2c f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc9001bfffb10 EFLAGS: 00010287
RAX: ffffffff895614d4 RBX: ffff88805536f050 RCX: 0000000000080000
RDX: ffffc9000f68c000 RSI: 0000000000003a17 RDI: 0000000000003a18
RBP: ffffc9001bfffcb8 R08: ffffffff90b10387 R09: 1ffffffff2162070
R10: dffffc0000000000 R11: fffffbfff2162071 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88805536f068 R15: 0000000000000001
FS: 00007f8254f896c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa67195da08 CR3: 00000000289d0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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:768 [inline]
<TASK>
kref_put include/linux/kref.h:65 [inline]
svc_put include/linux/sunrpc/svc.h:123 [inline]
__write_ports fs/nfsd/nfsctl.c:794 [inline]
write_ports+0xa26/0xb80 fs/nfsd/nfsctl.c:847
nfsctl_transaction_write+0x105/0x150 fs/nfsd/nfsctl.c:114
vfs_write+0x2dc/0x9a0 fs/read_write.c:582
ksys_write+0x14d/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f825419e019
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:00007f8254f89028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8254426090 RCX: 00007f825419e019
RDX: 0000000000000009 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f825423500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8254426128 R14: 00007f8254426090 R15: 00007ffd7c56b7f8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:svc_destroy+0x184/0x190 net/sunrpc/svc.c:578
Code: 5f 5d e9 ff bd 64 f8 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 24 ff ff ff 4c 89 ff e8 06 46 7d f8 e9 17 ff ff ff e8 4c 19 2c f8 <0f> 0b e8 45 19 2c f8 0f 0b 0f 1f 00 55 41 57 41 56 41 55 41 54 53
RSP: 0018:ffffc9001bfffb10 EFLAGS: 00010287
RAX: ffffffff895614d4 RBX: ffff88805536f050 RCX: 0000000000080000
RDX: ffffc9000f68c000 RSI: 0000000000003a17 RDI: 0000000000003a18
RBP: ffffc9001bfffcb8 R08: ffffffff90b10387 R09: 1ffffffff2162070
R10: dffffc0000000000 R11: fffffbfff2162071 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88805536f068 R15: 0000000000000001
FS: 00007f8254f896c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb533ded158 CR3: 00000000289d0000 CR4: 00000000003506e0
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