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* [Bug debug/102507] New: ICE in btf_finalize when compiling with -gbtf
@ 2021-09-27 21:04 ibhagatgnu at gmail dot com
  2021-09-27 21:06 ` [Bug debug/102507] " ibhagat at gcc dot gnu.org
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: ibhagatgnu at gmail dot com @ 2021-09-27 21:04 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102507

            Bug ID: 102507
           Summary: ICE in btf_finalize when compiling with -gbtf
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ibhagatgnu at gmail dot com
  Target Milestone: ---

Noticed this ICE (in gmp) when bootstrapping GCC with -gbtf as an experiment.

Program received signal SIGSEGV, Segmentation fault.
0x0000000000ce775c in simple_hashmap_traits<default_hash_traits<ctf_dvdef*>,
unsigned int>::is_empty<hash_map<ctf_dvdef*, unsigned int,
simple_hashmap_traits<default_hash_traits<ctf_dvdef*>, unsigned int>
>::hash_entry> (entry=...) at <SRC>/gcc/gcc/hash-map-traits.h:75
75        return H::is_empty (entry.m_key);
Missing separate debuginfos, use: debuginfo-install
glibc-2.17-260.0.9.el7.x86_64 libgcc-4.8.5-16.el7.x86_64
libstdc++-4.8.5-16.el7.x86_64
(gdb) bt
#0  0x0000000000ce775c in
simple_hashmap_traits<default_hash_traits<ctf_dvdef*>, unsigned
int>::is_empty<hash_map<ctf_dvdef*, unsigned int,
simple_hashmap_traits<default_hash_traits<ctf_dvdef*>, unsigned int>
>::hash_entry> (entry=...) at <SRC>/gcc/gcc/hash-map-traits.h:75
#1  0x0000000000ce7bab in hash_map<ctf_dvdef*, unsigned int,
simple_hashmap_traits<default_hash_traits<ctf_dvdef*>, unsigned int>
>::hash_entry::is_empty (e=...)
    at <SRC>/gcc/gcc/hash-map.h:71
#2  0x0000000000ce8623 in hash_table<hash_map<ctf_dvdef*, unsigned int,
simple_hashmap_traits<default_hash_traits<ctf_dvdef*>, unsigned int>
>::hash_entry, false, xcallocator>::is_empty (v=...)
    at <SRC>/gcc/gcc/hash-table.h:541
#3  0x0000000000ce8d30 in hash_table<hash_map<ctf_dvdef*, unsigned int,
simple_hashmap_traits<default_hash_traits<ctf_dvdef*>, unsigned int>
>::hash_entry, false, xcallocator>::~hash_table (this=0x7ffff088fe10, 
    __in_chrg=<optimized out>) at <SRC>/gcc/gcc/hash-table.h:681
#4  0x0000000000ce8c20 in hash_map<ctf_dvdef*, unsigned int,
simple_hashmap_traits<default_hash_traits<ctf_dvdef*>, unsigned int>
>::~hash_map (this=0x7ffff088fe10, __in_chrg=<optimized out>)
    at <SRC>/gcc/gcc/hash-map.h:39
#5  0x0000000000ce8c3a in finalize<hash_map<ctf_dvdef*, unsigned int,
simple_hashmap_traits<default_hash_traits<ctf_dvdef*>, unsigned int> > >
(p=0x7ffff088fe10) at <SRC>/gcc/gcc/ggc.h:162
#6  0x0000000000c31dd2 in finalizer::call (this=0x3fd29f8) at
<SRC>/gcc/gcc/ggc-page.c:333
#7  0x0000000000c304be in ggc_handle_finalizers () at
<SRC>/gcc/gcc/ggc-page.c:1928
#8  0x0000000000c30bd7 in ggc_collect (mode=GGC_COLLECT_HEURISTIC) at
<SRC>/gcc/gcc/ggc-page.c:2228
#9  0x0000000001244668 in execute_one_pass (pass=0x3f2e730) at
<SRC>/gcc/gcc/passes.c:2639
#10 0x00000000012446dd in execute_pass_list_1 (pass=0x3f2e730) at
<SRC>/gcc/gcc/passes.c:2656
#11 0x0000000001244764 in execute_pass_list (fn=0x7ffff077f600, pass=0x3f2e6d0)
at <SRC>/gcc/gcc/passes.c:2667
#12 0x00000000012426a6 in do_per_function_toporder (callback=0x1244727
<execute_pass_list(function*, opt_pass*)>, data=0x3f2e6d0) at
<SRC>/gcc/gcc/passes.c:1773
#13 0x0000000001245384 in execute_ipa_pass_list (pass=0x3f2e670) at
<SRC>/gcc/gcc/passes.c:3003
#14 0x0000000000d1299a in ipa_passes () at <SRC>/gcc/gcc/cgraphunit.c:2154
#15 0x0000000000d12dcc in symbol_table::compile (this=0x7ffff08c6000) at
<SRC>/gcc/gcc/cgraphunit.c:2289
#16 0x0000000000d13326 in symbol_table::finalize_compilation_unit
(this=0x7ffff08c6000) at <SRC>/gcc/gcc/cgraphunit.c:2537
#17 0x00000000013a19fd in compile_file () at <SRC>/gcc/gcc/toplev.c:483
#18 0x00000000013a4b11 in do_compile () at <SRC>/gcc/gcc/toplev.c:2233
#19 0x00000000013a4df7 in toplev::main (this=0x7fffffffdcf0, argc=24,
argv=0x7fffffffddf8) at <SRC>/gcc/gcc/toplev.c:2372
#20 0x00000000029109f2 in main (argc=24, argv=0x7fffffffddf8) at
<SRC>/gcc/gcc/main.c:39

Looks like the garbage collector, when cleaning up the btf_var_ids hash_map, is
working on invalid memory and bails out.

^ permalink raw reply	[flat|nested] 6+ messages in thread
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2021-09-27 21:04 [Bug debug/102507] New: ICE in btf_finalize when compiling with -gbtf ibhagatgnu at gmail dot com
2021-09-27 21:06 ` [Bug debug/102507] " ibhagat at gcc dot gnu.org
2021-09-29 20:29 ` cvs-commit at gcc dot gnu.org
2021-09-30  9:53 ` marxin at gcc dot gnu.org
2021-10-01 14:27 ` ibhagat at gcc dot gnu.org
2021-10-05 15:52 ` ibhagat at gcc dot gnu.org

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