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.
