<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=http://email.email.llvm.org/c/eJztWltv27gS_jXOC0FBd8kPeWjtZE9wWixwutg-GhRFSUyoSyjJl_z681GSnZvTa9ptFxZsWRrOlRzODAdO6nR3fkXSupq5UUduqnpDZEa6QrYEH0aSPieyIkqlM3dBGqEz81tromTSVxtZDfC6UjsQsY7IDsxEO7IrWNOIimxkVxAw8N6QTYH3KxBXNxP4njFZfnzzv0vSdozfkE4zLqCAFhDP67JRohMWuaqgU1kDOsK2BCKU5KyTxoTFqLkSLG1JVz_mlQhZ5aTseUHaotad0GTmxqxKQdQborYlhVBN1quZOzfmVKO-RltDurcDYpK-A4IgWa1UvTGD7z9ekFSUddVCXGdUJ6nMMqFFxY0NBJMDvdqRbhbaKyinOzyQdlcmtcL0zOzlzN7fQ3v6jK-uT2AlBNYW34M8TI3qU7DzFm2XytoqZt7FQy7rWqaGBobKCktjDJtFb4l5aUG2JPbMewuMYS4MVN5DzeOCOPZwDYCZ-3b4jEwaDQL4Qzxz3eEzN0hgCxTwALl7CZGAzaKl-Y46GSklk9VAOHIaNRwlTWwO6Pf2D05C6Vro1qz2AB9gE4QElmNb8fwpHVcMC0TX4-RBqxCfkZsWvNYpmHKmFM01awqSbhhGLCjPrBrr_Bi_gedAuQVchYGwIt60Qj9Tyt5gx7Nsaxr5i-lcdGaTbeNwFfq0r8x2rijct9_SvOonvEIbnmWdCuNzpKlbuR2HruC80FCkS6nNEJSrMOZeth22HH71zg_n2Za3RS7jm7Bk600Qul7T-psdd9OGDurRSS33MpHTMl3WPfYZx2aTKXYH-WOxgA8O0sate0xaqW_1WlbMVlmu1-ldttMyajfz9XYXNruypTnnFCvuDbIQkHAHCPcXZ8C9nPB_olah_7V6fRBK8E6kv4xCi8MUlb3qpJlqaGJhn858uwS_x2p_CokMkeIV_Mq93APBkVDOHUI7LZEUXtwAhIpSdrROrgkttVBsSzGz2JfTC-71mEpaQlPZskQJmmkh7t-UWpcmAslMIn8YMGc6pWumekErViLwUxPcaCbVCJjiwSBj4k6HzWeyUyfNSKaBR5sakVFg4y0HpbKSdQUVWlc1XqqaauOtSDXUDICKD7mm55hDmCFZO8gekzLtjLZ474aoQHnTm1mhoQ9QX4kBkIsKhkCBVCDN50KbIQiABnmamFBGM17DWJaDAPlWjl4Iq42WWIGubBCcauSedtd2mNwK3LRo615zYdCee2t7vUt8Vdie3mY7P5hL347Dm_ltPI90rvJsWuqNNrWDvl_yA1dd1x2hEsxZNubwJxIc986peJCVMnPvoo1klRtXQXAdOownZbWjOVyTU9fyPBrMYfwaRPtMSoc1qJiicjTpB1nwUGQ2zP8nZhhVhMYiKwnvJc4cADgzPyRCb-lbruUMq6WAl0qWm0WRHA6QsTQFGjLTcrVCPFn9583fF6uh1HJXi8ur1ZsP78EB1DUZ5eEOl6Us8hNmW3C-LeEP644p0ZkN9zgPkQQ-mJK-AeTdu7_f78GpyBgiAhl98TPp6WFV47qWZZnd3QqmTdlmKiZTpGEdDtXSoyrI4HsXn8L_4ev5kpjvccuR5wWSVZ3tjVOy7axPxNRvNWuMrabMRVSloqBjdCpShLuSCJWtxgU0DrMvXZ6IXl_ferdRehuvS-543Gt282jtRrcbebe-jbL0samH3M1151j1a7KTx9j9yLJikJqIXFZm47x7FVOO8fmBNhwVFwWh7TjlTeZI-0ZGsYx3IeNensW3TbGWD8TRUdgnxLxgUtzoJorsYq09njOWRJsqdNJbTyluR3qXP6oBJimvNTtfUxH9dIF4MFHw6W3gckyZbyum9jxRDexQtkhuNLkRUxp6lQ2p0sm6sRKx2tpyX8o5CpOD8MNaWgmRIqsMkBUSGuqNR2D-5cg_PxSIKn3diIa4MuW94O3Dw6UptT_WN6JC-iUu6aSpRLuabLRE1Y7SnZFZsHyRdMGarteYItMO2egaNLblezZ5P6JaIwc3DjzSMtN5aYez-4Gl65G_aoJyuFFsN7Q47snMGRaFmqyyeuj1mDaIID2-lI5jsG3_SIdeUt0MVbh14P78AfJwLiLvUOiQD5NKsMQ-gvlgGPqbHCrWojKJK-I7Po5g5aJ7iothnKPi7oYmUdPoemsNrYk3xI9sL4y98IikRSFVqrEKw4UDUUbIoi5LM63kQ8HMFP-ZXOOYNCKMnZ8DuTVd5PnTPeg50ovXEw2NyPncmoczNxjkIwDYw_OYyMmDh8MFb7GwzmTqVx0YHcajxXMgpfQlfFyrlXHvEWE1tIKOYb04YLpFx-BHNRm1mTtWFMNSqLUa21Zjvwv7Vpim2HG6L2D9SErsW6E7SVlno5zV_kDxWfqvk_YIm9LQ8sNR8tWfq0psVub8udq2Td9VX2fqN-uBCXAtP5jsx9GUF7rq1Yqtt-7DlpxB_YwXHqIfcsSkyt4LP-86Lzrk93ndkX4izRDEqOlsL5VKT42_U-Pv1Pg7Nf5Ojb9T4-93bvy5YRjE81Pj73dt_Hm72GXpbl4UYXO9Y42vfPcu9OI7Nyj97bYZQxkiaY9Y3T5v_Fnq1Pw7Nf9Ozb9T8-_nNv_u886p-fcrNP_i580__zdv_vmv0fybO05g-__G5h98Y_Jp02o5ND6m1ou9zZ5cX957-RJa8k80BmPX_GHsRzcGw-gfbAx68S_RGHT-NY3Bw18zz9JzL517c3bG-q6o9fl_C3bWa3VedF1j4gpCm0kasiv6xMIxzwRzFN_TD0VcMdHAlPtt25uoehl4ThCeFeeRxzOexJHPw2gesCR2vJQzYSdMRCKMgjPFEqHac5iPWh3rSgYW5jwQLM--XwN57tqui7LPdTzHtmNMeRzyII3jDPcgFDPfFpgSZRk-Vq3zM30-Hiz6vMWgOaW094OsxVEUmXhQGBp2slPi3HRNEy3YTfvwH8AJ4zfjf3bPBq3OB5X-D8Lrkrs>53156</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
lld breaks perf DWARF backtraces
</td>
</tr>
<tr>
<th>Labels</th>
<td>
new issue
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
Kha
</td>
</tr>
</table>
<pre>
I don't know if this is a bug in lld, perf, or libunwind, only that it doesn't happen with ld: when I link with lld, perf DWARF stack traces are incomplete. In a more complex application, this leads to stack traces being much shorter (and thus less helpful) than when linking with ld, but the following MWE demonstrates a difference in at least the `_start` symbol:
```
$ cat foo.c
#include <stdio.h>
void foo(int d) { int s = 0; for (int i = 0; i < 1000000; i++) { printf(""); s += i / d; } }
int main() { foo(100000); }
$ perf --version
perf version 5.10.89
$ clang -v foo.c && perf record --call-graph dwarf ./a.out && perf report | head -n 30
clang -v foo.c && perf record --call-graph dwarf ./a.out && perf report | head -n 30
clang version 13.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /nix/store/ry469fxcshgi8k6mavw5623ps4wyc2dp-clang-13.0.0/bin
Found candidate GCC installation: /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib/gcc/x86_64-unknown-linux-gnu/10.3.0
Found candidate GCC installation: /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib64/gcc/x86_64-unknown-linux-gnu/10.3.0
Selected GCC installation: /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib64/gcc/x86_64-unknown-linux-gnu/10.3.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
"/nix/store/ry469fxcshgi8k6mavw5623ps4wyc2dp-clang-13.0.0/bin/clang-13" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all --mrelax-relocations -disable-free -disable-llvm-verifier -discard-value-names -main-file-name foo.c -mrelocation-model static -mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -v -fcoverage-compilation-dir=/tmp -nostdsysteminc -resource-dir /nix/store/sjyb4lh03rxfy459i4086k9q897rglgf-clang-wrapper-13.0.0/resource-root -idirafter /nix/store/12z1nc5fmif2z7wian28n55j61acbmny-glibc-2.33-59-dev/include -internal-isystem /nix/store/sjyb4lh03rxfy459i4086k9q897rglgf-clang-wrapper-13.0.0/resource-root/include -fdebug-compilation-dir=/tmp -ferror-limit 19 -fgnuc-version=4.2.1 -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/foo-a74ba0.o -x c foo.c
clang -cc1 version 13.0.0 based upon LLVM 13.0.0 default target x86_64-unknown-linux-gnu
#include "..." search starts here:
#include <...> search starts here:
/nix/store/sjyb4lh03rxfy459i4086k9q897rglgf-clang-wrapper-13.0.0/resource-root/include
/nix/store/12z1nc5fmif2z7wian28n55j61acbmny-glibc-2.33-59-dev/include
End of search list.
"/nix/store/sjyb4lh03rxfy459i4086k9q897rglgf-clang-wrapper-13.0.0/bin/ld" --eh-frame-hdr -m elf_x86_64 -o a.out /nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib/crt1.o /nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib/crti.o /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib/gcc/x86_64-unknown-linux-gnu/10.3.0/crtbegin.o -L/nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib -L/nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib/gcc/x86_64-unknown-linux-gnu/10.3.0 -L/nix/store/m756011mkf1i0ki78i8y6ac3gf8qphvi-gcc-10.3.0-lib/x86_64-unknown-linux-gnu/lib -L/nix/store/8prp770hvr3cgaab7wn61dq3llc07ryg-clang-13.0.0-lib/lib -L/nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib64/gcc/x86_64-unknown-linux-gnu/10.3.0 -L/nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib64/gcc/x86_64-unknown-linux-gnu/10.3.0/../../../../lib64 -L/nix/store/ry469fxcshgi8k6mavw5623ps4wyc2dp-clang-13.0.0/bin/../lib -dynamic-linker=/nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib/ld-linux-x86-64.so.2 /tmp/foo-a74ba0.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib/gcc/x86_64-unknown-linux-gnu/10.3.0/crtend.o /nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib/crtn.o
[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.430 MB perf.data (53 samples) ]
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 53 of event 'cycles:u'
# Event count (approx.): 47036836
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................ .................................
#
99.96% 0.00% a.out a.out [.] _start
|
---_start
__libc_start_main
main
foo
|
--91.78%--__printf (inlined)
|
--84.62%--__vfprintf_internal
|
|--6.46%--_IO_new_file_xsputn (inlined)
|
--2.45%--__strchrnul_avx2
99.96% 0.00% a.out libc-2.33.so [.] __libc_start_main
|
---__libc_start_main
main
$ clang -v -fuse-ld=lld foo.c && perf record --call-graph dwarf ./a.out && perf report | head -n 30
clang version 13.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /nix/store/ry469fxcshgi8k6mavw5623ps4wyc2dp-clang-13.0.0/bin
Found candidate GCC installation: /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib/gcc/x86_64-unknown-linux-gnu/10.3.0
Found candidate GCC installation: /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib64/gcc/x86_64-unknown-linux-gnu/10.3.0
Selected GCC installation: /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib64/gcc/x86_64-unknown-linux-gnu/10.3.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
"/nix/store/ry469fxcshgi8k6mavw5623ps4wyc2dp-clang-13.0.0/bin/clang-13" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all --mrelax-relocations -disable-free -disable-llvm-verifier -discard-value-names -main-file-name foo.c -mrelocation-model static -mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -v -fcoverage-compilation-dir=/tmp -nostdsysteminc -resource-dir /nix/store/sjyb4lh03rxfy459i4086k9q897rglgf-clang-wrapper-13.0.0/resource-root -idirafter /nix/store/12z1nc5fmif2z7wian28n55j61acbmny-glibc-2.33-59-dev/include -internal-isystem /nix/store/sjyb4lh03rxfy459i4086k9q897rglgf-clang-wrapper-13.0.0/resource-root/include -fdebug-compilation-dir=/tmp -ferror-limit 19 -fgnuc-version=4.2.1 -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/foo-266589.o -x c foo.c
clang -cc1 version 13.0.0 based upon LLVM 13.0.0 default target x86_64-unknown-linux-gnu
#include "..." search starts here:
#include <...> search starts here:
/nix/store/sjyb4lh03rxfy459i4086k9q897rglgf-clang-wrapper-13.0.0/resource-root/include
/nix/store/12z1nc5fmif2z7wian28n55j61acbmny-glibc-2.33-59-dev/include
End of search list.
"/nix/store/3y82ady9hh6pjyap4l42z638z25m4xxp-llvm-binutils-13.0.0/bin/ld.lld" --eh-frame-hdr -m elf_x86_64 -o a.out /nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib/crt1.o /nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib/crti.o /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib/gcc/x86_64-unknown-linux-gnu/10.3.0/crtbegin.o -L/nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib -L/nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib/gcc/x86_64-unknown-linux-gnu/10.3.0 -L/nix/store/m756011mkf1i0ki78i8y6ac3gf8qphvi-gcc-10.3.0-lib/x86_64-unknown-linux-gnu/lib -L/nix/store/8prp770hvr3cgaab7wn61dq3llc07ryg-clang-13.0.0-lib/lib -L/nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib64/gcc/x86_64-unknown-linux-gnu/10.3.0 -L/nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib64/gcc/x86_64-unknown-linux-gnu/10.3.0/../../../../lib64 -L/nix/store/ry469fxcshgi8k6mavw5623ps4wyc2dp-clang-13.0.0/bin/../lib -dynamic-linker=/nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib/ld-linux-x86-64.so.2 /tmp/foo-266589.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /nix/store/mrqrvina0lfgrvdzfyri7sw9vxy6pyms-gcc-10.3.0/lib/gcc/x86_64-unknown-linux-gnu/10.3.0/crtend.o /nix/store/vjq3q7dq8vmc13c3py97v27qwizvq7fd-glibc-2.33-59/lib/crtn.o
[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.438 MB perf.data (54 samples) ]
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 54 of event 'cycles:u'
# Event count (approx.): 47911504
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................ .................................
#
99.96% 0.00% a.out [unknown] [.] 0xffffffffffffffff
|
---0xffffffffffffffff
__libc_start_main
main
foo
|
--82.89%--__printf (inlined)
|
--67.62%--__vfprintf_internal
|
|--6.38%--_IO_new_file_xsputn (inlined)
|
--2.41%--__strchrnul_avx2
99.96% 0.00% a.out libc-2.33.so [.] __libc_start_main
|
---__libc_start_main
main
```
</pre>
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