34 lines
1.3 KiB
Text
34 lines
1.3 KiB
Text
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1. How do I symbolicate kernel panic traces?
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Just add keepsyms=1 to either the Kernel Flags setting in /Library/Preferences/SystemConfiguration/com.apple.Boot.plist,
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or to the boot-args NVRAM variable. Reboot, and any subsequent panics will be automatically symbolicated. You can run
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mangled C++ symbols through the c++filt command line utility to get the proper C++ function signatures.
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$ sudo nvram boot-args="-v keepsyms=1"
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Thanks for Phil Dennis-Jordan for this great tip.
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2. Debugging a AVX related crash which occurs at bootup.
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$ nm /System/Library/Extensions/corecrypto.kext/Contents/MacOS/corecrypto | grep avx
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0000000000001840 T _ccsha256_vng_intel_avx1_compress
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0000000000036708 T _ccsha256_vng_intel_avx2_compress
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0000000000026973 T _ccsha512_vng_intel_avx1_compress
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00000000000327cb T _ccsha512_vng_intel_avx2_compress
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000000000001d960 T _gcmDecrypt_avx1
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000000000001c980 T _gcmEncrypt_avx1
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$ gdb /System/Library/Extensions/corecrypto.kext/Contents/MacOS/corecrypto
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(gdb) x/16i 0x0000000000001840
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0x1840: push %rbp
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0x1841: mov %rsp,%rbp
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0x1844: push %rbx
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0x1845: push %r12
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0x1847: push %r13
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0x1849: push %r14
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0x184b: push %r15
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0x184d: sub $0x168,%rsp
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0x1854: lea 0x60(%rsp),%rax
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0x1859: and $0xffffffffffffffe0,%rax
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0x185d: vmovdqa %ymm0,(%rax) <--- the crash occurs here due to lack of "xsave" support
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