Hi, We ran into a weird *out of range* issue of *strconv.formatBits*, hope someone can shed a light on what could be the root cause, any comment is highly appreciated.
problem description: * random out of range at code <https://github.com/golang/go/blob/release-branch.go1.20/src/strconv/itoa.go#L140>, most of the time the indexing is a huge int but we observed at least one exception (#2).* * #1: runtime error: index out of range [18446744073709449339] with length 200* * #2: runtime error: index out of range [102511] with length 200* Wild guesses: 1. The machine code seems to suggest it's unlikely a data race or memory corruption? But perhaps relevant registers, like R10, had been saved and restored, then it might be due to stack corruption? Given that R12 is scratch reg, is it possible that R12 is clobbered somehow, say, by signal handling? =================================================================== 0x0000000000495b0a<+810>: mov %rdi,%r10 0x0000000000495b0d<+813>: shr %rdi 0x0000000000495b10<+816>: mov %rax,%rsi 0x0000000000495b13<+819>: movabs $0xa3d70a3d70a3d70b,%rax 0x0000000000495b1d<+829>: mov %rdx,%r11 0x0000000000495b20<+832>: mul %rdi 0x0000000000495b23<+835>: shr $0x5,%rdx * 0x0000000000495b27<+839>: imul $0x64,%rdx,%r12* * 0x0000000000495b2b<+843>: sub %r12,%r10* * 0x0000000000495b2e<+846>: lea (%r10,%r10,1),%rax* 0x0000000000495b32<+850>: lea 0x1(%rax),%rax 0x0000000000495b36<+854>: nopw 0x0(%rax,%rax,1) 0x0000000000495b3f<+863>: nop 0x0000000000495b40<+864>: cmp $0xc8,%rax 0x0000000000495b46<+870>: jae 0x495c8f <strconv.formatBits+1199> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/ff804d4c-24ee-480d-8ed1-219f9b8d7cbcn%40googlegroups.com.
