https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84105
Bug ID: 84105
Summary: [8 regression] Segmentation fault in
pp_tree_identifier() during LTO
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: arnd at linaro dot org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
I got an ICE while building the linux kernel module net/sctp/sctp.ko with
i386-linux-gcc-8.0.1, currently using r257114. A slightly older gcc-8.0.0
(dated 20180107, exact revision unknown) doesn't have this problem.
/bin/bash /git/arm-soc/scripts/gcc-ld -fuse-linker-plugin -flto=jobserver
-flto -fno-strict-aliasing -fno-fat-lto-objects -Wno-attribute-alias
-fwhole-program -fno-strict-aliasing -fdump-ipa-cgraph
-fdump-ipa-inline-details -fipa-cp-clone -r -m elf_i386 -T
/git/arm-soc/scripts/module-common.lds --build-id -o net/sctp/sctp.ko
net/sctp/sctp.o net/sctp/sctp.mod.o ; true
during IPA pass: inline
dump file: net/sctp/sctp.ko.ltrans0.079i.inline
/git/arm-soc/net/sctp/sm_sideeffect.c: In function 'sctp_do_sm':
/git/arm-soc/net/sctp/sm_sideeffect.c:1155:5: internal compiler error:
Segmentation fault
int sctp_do_sm(struct net *net, enum sctp_event event_type,
^
0xa42b7f crash_signal
/home/arnd/git/gcc/gcc/toplev.c:325
0xaf0659 pp_tree_identifier(pretty_printer*, tree_node*)
/home/arnd/git/gcc/gcc/tree-pretty-print.c:4006
0xaf0966 dump_decl_name
/home/arnd/git/gcc/gcc/tree-pretty-print.c:261
0xaf42ea dump_generic_node(pretty_printer*, tree_node*, int, unsigned long,
bool)
/home/arnd/git/gcc/gcc/tree-pretty-print.c:1826
0xaf769a print_declaration(pretty_printer*, tree_node*, int, unsigned long)
/home/arnd/git/gcc/gcc/tree-pretty-print.c:3333
0xaf7997 print_generic_decl(_IO_FILE*, tree_node*, unsigned long)
/home/arnd/git/gcc/gcc/tree-pretty-print.c:122
0xb4603a dump_scope_block
/home/arnd/git/gcc/gcc/tree-ssa-live.c:647
0xb471b9 dump_scope_blocks(_IO_FILE*, unsigned long)
/home/arnd/git/gcc/gcc/tree-ssa-live.c:678
0xb471b9 remove_unused_locals()
/home/arnd/git/gcc/gcc/tree-ssa-live.c:870
0x97af44 execute_function_todo
/home/arnd/git/gcc/gcc/passes.c:1972
0x97b8b9 execute_todo
/home/arnd/git/gcc/gcc/passes.c:2048
0x97dac5 execute_one_ipa_transform_pass
/home/arnd/git/gcc/gcc/passes.c:2245
0x97dac5 execute_all_ipa_transforms()
/home/arnd/git/gcc/gcc/passes.c:2281
0x6d681c cgraph_node::expand()
/home/arnd/git/gcc/gcc/cgraphunit.c:2132
0x6d7b38 expand_all_functions
/home/arnd/git/gcc/gcc/cgraphunit.c:2275
0x6d7b38 symbol_table::compile()
/home/arnd/git/gcc/gcc/cgraphunit.c:2624
0x656c51 lto_main()
/home/arnd/git/gcc/gcc/lto/lto.c:3349
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
I have not been able to create a simple test case for it, but can provide steps
for reproducing, or help test patches. If necessary, I can do a bisection, but
maybe someone can see from the backtrace what is happening, or has a duplicate
bugreport.
>From what I can tell, the ICE is caused by a typedef inside of a function,
moving the typedef outside of the function avoids the problem. See the source
code at:
https://elixir.free-electrons.com/linux/v4.15/source/net/sctp/sm_sideeffect.c#L1172
