Re: [PATCH] D111199: [Clang][LLVM][Attr] support btf_type_tag attribute

[Yonghong Song via cfe-commits]

On 11/6/21 4:36 PM, Nathan Chancellor via Phabricator wrote:

nathanchance added a comment.

I bisected a crash in the Linux kernel down to the reland commit (and it is not 
fixed as of 
https://github.com/llvm/llvm-project/commit/2249ecee8d9a6237f51485bd39f01ba031575987):

   $ git bisect log
   # bad: [bdaa181007a46d317a1665acb8234eddeee82815] 
[TwoAddressInstructionPass] Update existing physreg live intervals
   # good: [d4b1cf8f9c48a49ab808df15c4ab378276a07b82] [OpenMP] Build device 
runtimes for sm_86
   git bisect start 'bdaa181007a46d317a1665acb8234eddeee82815' 
'd4b1cf8f9c48a49ab808df15c4ab378276a07b82'
   # good: [f2703c3c3353031de8de8c465a59d31488b11fb3] [DAG] FoldConstantArithmetic 
- rename NumOps -> NumElts. NFC.
   git bisect good f2703c3c3353031de8de8c465a59d31488b11fb3
   # good: [c68183b81e5257186c9403cf91f8b958af7459bc] [gn build] Use `=` for of 
-fdebug-compilation-dir
   git bisect good c68183b81e5257186c9403cf91f8b958af7459bc
   # bad: [2d8ec3c61d3c2d47b303187bb882ca23544f6fc5] [libcxx] [test] Narrow down XFAILs regarding 
a MSVC mode specific bug to "windows-dll && msvc"
   git bisect bad 2d8ec3c61d3c2d47b303187bb882ca23544f6fc5
   # good: [97c899f3c5d9bbff2824b3252b21378bf96f3f3f] [mlir] Add callback to 
provide a pass pipeline to MlirOptMain
   git bisect good 97c899f3c5d9bbff2824b3252b21378bf96f3f3f
   # bad: [4070f305f9a0c488d7177754d77c0b367e8695bf] [mlir][DialectConversion] 
Legalize all live argument conversions
   git bisect bad 4070f305f9a0c488d7177754d77c0b367e8695bf
   # bad: [3466e00716e12e32fdb100e3fcfca5c2b3e8d784] Reland "[Attr] support 
btf_type_tag attribute"
   git bisect bad 3466e00716e12e32fdb100e3fcfca5c2b3e8d784
   # good: [f64580f8d2ce5e1161857f9c89c2eee7a74c5ab8] [AArch64][GISel] Optimize 
8 and 16 bit variants of uaddo.
   git bisect good f64580f8d2ce5e1161857f9c89c2eee7a74c5ab8
   # first bad commit: [3466e00716e12e32fdb100e3fcfca5c2b3e8d784] Reland "[Attr] 
support btf_type_tag attribute"

Thanks. I will look at this problem immediately.

`cvise` spits out:

   $ cat efi.i
   typedef unsigned long efi_query_variable_info_t(int);
   typedef struct {
     struct {
       efi_query_variable_info_t __attribute__((regparm(0))) * 
query_variable_info;
     };
   } efi_runtime_services_t;
   efi_runtime_services_t efi_0;

$ clang -m32 -O2 -c -o /dev/null efi.i

[...]
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