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Internal error in ptrace_request

Status: upstream: reported syz repro on 2025/08/12 10:44
Reported-by: syzbot+7db3bf50736f702a7a41@syzkaller.appspotmail.com
First crash: 14d, last: 4d23h
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/08/26 linux-5.15.y (ToT) c79648372d02 syz Failed due to an error; will retry later
2025/08/26 upstream (ToT) fab1beda7597 syz Didn't crash

Sample crash report:
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4230 Comm: syz.0.17 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 : ptrace_request+0xddc/0x1d00 kernel/ptrace.c:1253
lr : ptrace_request+0xdb0/0x1d00 kernel/ptrace.c:1253
sp : ffff80001f957a20
x29: ffff80001f957c90 x28: 0000000000000000 x27: ffff700003f2af4c
x26: dfff800000000000 x25: 00000000fffffff2 x24: ffff0000d61cd1e4
x23: ffff0000d61cd1c0 x22: 0000000000004204 x21: 0000000000000002
x20: ffff0000c8563680 x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000081b2c2c x15: 000000000000420f
x14: 0000000000ff0100 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : 0000ffffffffffff
x8 : 0000000000000000 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 ptrace_request+0xddc/0x1d00 kernel/ptrace.c:1253
 arch_ptrace+0x78/0x94 arch/arm64/kernel/ptrace.c:1794
 __do_sys_ptrace kernel/ptrace.c:1328 [inline]
 __se_sys_ptrace kernel/ptrace.c:1293 [inline]
 __arm64_sys_ptrace+0x1d0/0x5a0 kernel/ptrace.c:1293
 __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: ea29011f 9a9f026a d503229f f840095c (2a1903e1) 
---[ end trace 2a7fa1216ca6e764 ]---
----------------
Code disassembly (best guess):
   0:	ea29011f 	bics	xzr, x8, x9
   4:	9a9f026a 	csel	x10, x19, xzr, eq	// eq = none
   8:	d503229f 	csdb
   c:	f840095c 	ldtr	x28, [x10]
* 10:	2a1903e1 	mov	w1, w25 <-- trapping instruction

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/21 12:58 linux-5.15.y c79648372d02 0b9605c8 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/22 02:54 linux-5.15.y c79648372d02 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/22 02:52 linux-5.15.y c79648372d02 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/22 02:50 linux-5.15.y c79648372d02 3e79b825 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/21 05:35 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/20 23:28 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/20 23:28 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/20 23:27 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/20 22:36 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/20 22:33 linux-5.15.y c79648372d02 0b9605c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/15 00:26 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/15 00:23 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/15 00:23 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/15 00:05 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/15 00:05 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/14 23:14 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/14 23:12 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/14 23:11 linux-5.15.y c79648372d02 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/12 14:51 linux-5.15.y c79648372d02 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/12 10:43 linux-5.15.y c79648372d02 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
2025/08/12 10:43 linux-5.15.y c79648372d02 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in ptrace_request
* Struck through repros no longer work on HEAD.