https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63135
Bug ID: 63135
Summary: [4.9 regression] Infinite loop in var-tracking
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: krebbel at gcc dot gnu.org
Created attachment 33435
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33435&action=edit
Preprocessed zsh 5.0.6 source file
zsh compilation runs into infinite loop on S/390:
cc1 builtin.i -m64 -mzarch -march=z900 -g -O2 -fstack-protector-all -o
builtin.s
reghunt indicates that the failure started to appear with r208165 and for
mainline got fixed (or papered over) with r211007. However, it still fails with
GCC 4.9 branch.
(gdb) bt
#0 0x000000008088f8ea in dv_uid (dv=0x812accb8) at
/home/andreas/clean/gcc/gcc/var-tracking.c:443
#1 dv_htab_hash (dv=0x812accb8) at
/home/andreas/clean/gcc/gcc/var-tracking.c:461
#2 dv_htab_hash (dv=0x812accb8) at
/home/andreas/clean/gcc/gcc/var-tracking.c:1604
#3 vars_copy (src=..., dst=...) at
/home/andreas/clean/gcc/gcc/var-tracking.c:1816
#4 shared_hash_unshare (vars=0x81258960) at
/home/andreas/clean/gcc/gcc/var-tracking.c:1610
#5 0x0000000080895d34 in shared_hash_find_slot_unshare_1 (ins=INSERT,
dvhash=169, dv=0x81188080,
pvars=0x81187758) at /home/andreas/clean/gcc/gcc/var-tracking.c:1646
#6 shared_hash_find_slot_unshare (ins=INSERT, dv=0x81188080, pvars=0x81187758)
at /home/andreas/clean/gcc/gcc/var-tracking.c:1654
#7 set_variable_part (set=0x81187620, loc=0x3fff6e1e8b8, dv=0x81188080,
offset=0,
initialized=VAR_INIT_STATUS_INITIALIZED, set_src=0x0, iopt=INSERT)
at /home/andreas/clean/gcc/gcc/var-tracking.c:7768
#8 0x000000008089625a in var_mem_decl_set (set=0x81187620, loc=0x3fff6e1e8b8,
initialized=<optimized out>, dv=0x81188080, offset=<optimized out>,
set_src=0x0, iopt=INSERT)
at /home/andreas/clean/gcc/gcc/var-tracking.c:2341
#9 0x000000008089acd0 in val_bind (modified=<optimized out>, loc=<optimized
out>,
val=<optimized out>, set=<optimized out>) at
/home/andreas/clean/gcc/gcc/var-tracking.c:2455
#10 val_resolve (set=0x81187620, val=0x81188080, loc=0x3fff6e1e8b8,
insn=<optimized out>)
at /home/andreas/clean/gcc/gcc/var-tracking.c:2653
#11 0x000000008089b8b6 in compute_bb_dataflow (bb=0x3fff6cbcc30)
at /home/andreas/clean/gcc/gcc/var-tracking.c:6718
#12 0x000000008089cba4 in vt_find_locations () at
/home/andreas/clean/gcc/gcc/var-tracking.c:7070
#13 0x000000008089f0ca in variable_tracking_main_1 ()
at /home/andreas/clean/gcc/gcc/var-tracking.c:10294
