syzbot


Internal error in sys_waitid

Status: upstream: reported C repro on 2025/08/08 15:29
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+086f3517f18d5f4769bd@syzkaller.appspotmail.com
First crash: 6d18h, last: 12h53m
Bug presence (2)
Date Name Commit Repro Result
2025/08/14 linux-5.15.y (ToT) c79648372d02 C [report] Internal error in sys_waitid
2025/08/14 upstream (ToT) 24ea63ea3877 C Didn't crash

Sample crash report:
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4251 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 : __do_sys_waitid kernel/exit.c:1705 [inline]
pc : __se_sys_waitid kernel/exit.c:1684 [inline]
pc : __arm64_sys_waitid+0x4d8/0x9bc kernel/exit.c:1684
lr : __do_sys_waitid kernel/exit.c:1705 [inline]
lr : __se_sys_waitid kernel/exit.c:1684 [inline]
lr : __arm64_sys_waitid+0x4b4/0x9bc kernel/exit.c:1684
sp : ffff80001f907bc0
x29: ffff80001f907d20 x28: 00000020002ffd00 x27: dfff800000000000
x26: ffff700003f20f7c x25: 0000000020002ffd x24: 1fffe0001a8caa3c
x23: 00000000fffffff2 x22: ffff0000d46551e4 x21: ffff0000d46551c0
x20: ffffffffffffffea x19: 0000000020002ff9 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800008196c3c x15: 0000000000000000
x14: 0000000000000000 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000020002ffd x9 : 0000ffffffffffff
x8 : 0000000020002ffd x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 __do_sys_waitid kernel/exit.c:1705 [inline]
 __se_sys_waitid kernel/exit.c:1684 [inline]
 __arm64_sys_waitid+0x4d8/0x9bc kernel/exit.c:1684
 __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 2a1f03f7 2a1f03e0 b8000957 (2a1703e1) 
---[ end trace ac1119fe89975aa6 ]---
----------------
Code disassembly (best guess):
   0:	d503229f 	csdb
   4:	2a1f03f7 	mov	w23, wzr
   8:	2a1f03e0 	mov	w0, wzr
   c:	b8000957 	sttr	w23, [x10]
* 10:	2a1703e1 	mov	w1, w23 <-- trapping instruction

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/11 05:17 linux-5.15.y c79648372d02 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/10 21:14 linux-5.15.y c79648372d02 32a0e5ed .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/09 13:02 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/09 12:58 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/09 11:00 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/09 10:54 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/09 07:45 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/09 05:38 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/08 21:57 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/08 21:57 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/08 15:56 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/08 15:54 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/08 15:30 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/08 15:29 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
2025/08/08 15:28 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_waitid
* Struck through repros no longer work on HEAD.