[v5.15] Internal error in sys_rseq

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syzbot

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Aug 8, 2025, 10:42:29 AM8/8/25

to syzkaller...@googlegroups.com

Hello,

syzbot found the following issue on:

HEAD commit: c79648372d02 Linux 5.15.189
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11ad55bc580000
kernel config: https://syzkaller.appspot.com/x/.config?x=9e47345638b85bd0
dashboard link: https://syzkaller.appspot.com/bug?extid=654c7986ea440616d72a
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7ab49562317a/disk-c7964837.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e847ec1e38d3/vmlinux-c7964837.xz
kernel image: https://storage.googleapis.com/syzbot-assets/263158c6371c/Image-c7964837.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+654c79...@syzkaller.appspotmail.com

Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 5259 Comm: syz.4.500 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : rseq_get_rseq_cs_ptr_val kernel/rseq.c:131 [inline]
pc : __do_sys_rseq kernel/rseq.c:408 [inline]
pc : __se_sys_rseq kernel/rseq.c:350 [inline]
pc : __arm64_sys_rseq+0x408/0x75c kernel/rseq.c:350
lr : rseq_get_rseq_cs_ptr_val kernel/rseq.c:131 [inline]
lr : __do_sys_rseq kernel/rseq.c:408 [inline]
lr : __se_sys_rseq kernel/rseq.c:350 [inline]
lr : __arm64_sys_rseq+0x3e4/0x75c kernel/rseq.c:350
sp : ffff800020057d10
x29: ffff800020057d20 x28: ffff0000d60f8000 x27: 0000000000000800
x26: 1fffe0001ac1f28d x25: dfff800000000000 x24: 00000000fffffff2
x23: 0000000000000000 x22: ffff0000d60f9468 x21: ffff0000d60f8000
x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800008659874 x15: 0000000000000000
x14: 0000000000000000 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000008 x9 : 0000ffffffffffff
x8 : 0000000000000008 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
rseq_get_rseq_cs_ptr_val kernel/rseq.c:131 [inline]
__do_sys_rseq kernel/rseq.c:408 [inline]
__se_sys_rseq kernel/rseq.c:350 [inline]
__arm64_sys_rseq+0x408/0x75c kernel/rseq.c:350
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03f8 2a1f03e0 f8400957 (2a1803e1)
---[ end trace e1d52d31fa5e1334 ]---
----------------
Code disassembly (best guess):
0: d503229f csdb
4: 2a1f03f8 mov w24, wzr
8: 2a1f03e0 mov w0, wzr
c: f8400957 ldtr x23, [x10]
* 10: 2a1803e1 mov w1, w24 <-- trapping instruction

---
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:
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If the report is already addressed, let syzbot know by replying with:
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(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
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syzbot

unread,

Aug 10, 2025, 5:42:27 AM8/10/25

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: c79648372d02 Linux 5.15.189
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=12633434580000

kernel config: https://syzkaller.appspot.com/x/.config?x=9e47345638b85bd0
dashboard link: https://syzkaller.appspot.com/bug?extid=654c7986ea440616d72a
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12f30842580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7ab49562317a/disk-c7964837.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e847ec1e38d3/vmlinux-c7964837.xz
kernel image: https://storage.googleapis.com/syzbot-assets/263158c6371c/Image-c7964837.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+654c79...@syzkaller.appspotmail.com

Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:

CPU: 0 PID: 4319 Comm: syz.3.20 Not tainted 5.15.189-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : rseq_get_rseq_cs_ptr_val kernel/rseq.c:131 [inline]
pc : __do_sys_rseq kernel/rseq.c:408 [inline]
pc : __se_sys_rseq kernel/rseq.c:350 [inline]
pc : __arm64_sys_rseq+0x408/0x75c kernel/rseq.c:350
lr : rseq_get_rseq_cs_ptr_val kernel/rseq.c:131 [inline]
lr : __do_sys_rseq kernel/rseq.c:408 [inline]
lr : __se_sys_rseq kernel/rseq.c:350 [inline]
lr : __arm64_sys_rseq+0x3e4/0x75c kernel/rseq.c:350

sp : ffff8000200e7d10
x29: ffff8000200e7d20 x28: ffff0000cadb1b40 x27: 0000000000000800
x26: 1fffe000195b65f5 x25: dfff800000000000 x24: 00000000fffffff2
x23: 0000000000000000 x22: ffff0000cadb2fa8 x21: ffff0000cadb1b40

x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800008659874 x15: 0000000000000000
x14: 0000000000000000 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000008 x9 : 0000ffffffffffff
x8 : 0000000000000008 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
rseq_get_rseq_cs_ptr_val kernel/rseq.c:131 [inline]
__do_sys_rseq kernel/rseq.c:408 [inline]
__se_sys_rseq kernel/rseq.c:350 [inline]
__arm64_sys_rseq+0x408/0x75c kernel/rseq.c:350
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03f8 2a1f03e0 f8400957 (2a1803e1)

---[ end trace 8f265e9867e4dcff ]---

----------------
Code disassembly (best guess):
0: d503229f csdb
4: 2a1f03f8 mov w24, wzr
8: 2a1f03e0 mov w0, wzr
c: f8400957 ldtr x23, [x10]
* 10: 2a1803e1 mov w1, w24 <-- trapping instruction

---

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.

syzbot

unread,

Aug 11, 2025, 12:55:32 PM8/11/25

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: c79648372d02 Linux 5.15.189
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=11bac842580000

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15bac842580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=108d05a2580000

CPU: 0 PID: 4231 Comm: syz.1.18 Not tainted 5.15.189-syzkaller #0

sp : ffff80001ffd7d10
x29: ffff80001ffd7d20 x28: ffff0000db9f0000 x27: 0000000000000800
x26: 1fffe0001b73e28d x25: dfff800000000000 x24: 00000000fffffff2
x23: 0000000000000000 x22: ffff0000db9f1468 x21: ffff0000db9f0000

---[ end trace 1e83c8edd4a8bd7b ]---

----------------
Code disassembly (best guess):
0: d503229f csdb
4: 2a1f03f8 mov w24, wzr
8: 2a1f03e0 mov w0, wzr
c: f8400957 ldtr x23, [x10]
* 10: 2a1803e1 mov w1, w24 <-- trapping instruction

---

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