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Diffstat (limited to 'results/classifier/mode-deepseek-r1:32b/reasoning/user/1361')
| -rw-r--r-- | results/classifier/mode-deepseek-r1:32b/reasoning/user/1361 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/results/classifier/mode-deepseek-r1:32b/reasoning/user/1361 b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1361 new file mode 100644 index 00000000..af44292b --- /dev/null +++ b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1361 @@ -0,0 +1,17 @@ +<think> +Okay, I'm trying to figure out whether this bug is related to user-mode or system-mode in QEMU. Let's break down the information given. + +The problem occurs when running a PowerPC64 little-endian Linux build inside QEMU using user emulation with 64KiB pages. The failure started after moving from Ubuntu Focal (20.04) to Jammy (22.04), which updated QEMU from v4.2 to v6.2. So, the issue is tied to a change in QEMU's behavior. + +The error is an erroneous SIGSEGV SEGV_MAPERR at address 0x0000004001be5000. The user provided logs showing that this address was mapped by an mmap call with MAP_PRIVATE|MAP_DENYWRITE|MAP_FIXED, mapping a section of libstdc++.so.6. So the memory seems to be correctly mapped, but the process is still getting a segmentation fault. + +They mentioned bisecting and found that the issue started with commit 4dcf078f in QEMU, which might expose an underlying bug rather than causing it directly. The steps to reproduce involve running a ppc64el executable under qemu-user with the -p 65536 option. + +Now, considering whether this is user-mode or system-mode related. User-mode emulation deals with executing the target architecture's code on the host without full OS virtualization. System-mode involves emulating an entire system, including hardware devices and a kernel. + +In this case, they're using qemu-user, which is for user-mode emulation. The issue arises when running an executable under user emulation, specifically related to memory mapping and segmentation faults. This suggests it's about how QEMU handles the target architecture's memory management in user mode, possibly issues with page size handling or TLB (Translation Lookaside Buffer) flushes. + +Since the problem occurs during execution of the program without involving lower-level system calls like device emulation, it points more towards a user-mode issue. The bug seems to be in how QEMU manages memory mappings or translates addresses when using 64KiB pages on ppc64le. +</think> + +user \ No newline at end of file |