Messages in this thread | | | Date | Sat, 20 Nov 2004 14:37:55 +0000 | From | Russell King <> | Subject | sparse segfaults |
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Linus,
Sparse appears to segfault when trying to check kernel/timer.c:
CC kernel/ptrace.o CHECK /home/rmk/bk/linux-2.6-rmk/kernel/timer.c make[2]: *** [kernel/timer.o] Error 139 make[1]: *** [kernel] Error 2 make: *** [_all] Error 2
It doesn't seem to matter which ARM machine I have my kernel configured for, the result is always the same.
#0 0x08059222 in expand_conditional (expr=0xf6a88c4c) at expand.c:478 478 *expr = *true; (gdb) where #0 0x08059222 in expand_conditional (expr=0xf6a88c4c) at expand.c:478 #1 0x08059956 in expand_expression (expr=0xf6a88c4c) at expand.c:859 #2 0x08059a32 in expand_symbol (sym=0x5) at expand.c:917 #3 0x08048cc0 in clean_up_symbols (list=0x9464fb0) at check.c:100 #4 0x08048eb5 in main (argc=40, argv=0xfef19dc4) at check.c:192 (gdb) print expr $1 = (struct expression *) 0xf6a88c4c (gdb) print true $2 = (struct expression *) 0x0 (gdb) print *expr $3 = {type = EXPR_CONDITIONAL, op = 63, pos = {type = 6, stream = 1, newline = 0, whitespace = 1, pos = 22, line = 566, noexpand = 0}, ctype = 0x80764a0, {value = 4138241036, fvalue = <invalid float value>, string = 0xf6a88c0c, unop = 0xf6a88c0c, statement = 0xf6a88c0c, expr_list = 0xf6a88c0c}}
Unfortunately, gdb won't show me the contents of expr->cond_true nor expr->cond_false without the following:
(gdb) print *(&expr->string) $4 = (struct string *) 0xf6a88c0c (gdb) print *(&expr->string+1) $5 = (struct string *) 0x0 (gdb) print *(&expr->string+2) $6 = (struct string *) 0xf6a88c6c
Looks like expr->cond_true is NULL. Line 566 of kernel/timer.c is:
int tickadj = 500/HZ ? : 1; /* microsecs */
which makes it look like sparse doesn't understand such constructions.
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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