f9d9182d64
inlining resulted in constant propagation to the extend that cmpval was known to the compiler to be URWLOCK_WRITE_OWNER (= 0x80000000U). Unfortunately, instead of zero-extending the unsigned constant, it was sign-extended. As such, the cmpxchg instruction was comparing 0x0000000080000000LU to 0xffffffff80000000LU and obviously didn't perform the exchange. But, since the value returned by cmpxhg equalled cmpval (when zero- extended), the _thr_rtld_lock_release() function thought the exchange did happen and as such returned as if having released the lock. This was not the case. Subsequent locking requests found rw_state non-zero and the thread in question entered the kernel and block indefinitely. The work-around is to zero-extend by casting to uint64_t. |
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| .. | ||
| pc | ||
| _bus.h | ||
| _inttypes.h | ||
| _limits.h | ||
| _regset.h | ||
| _stdint.h | ||
| _types.h | ||
| acpica_machdep.h | ||
| asm.h | ||
| atomic.h | ||
| bootinfo.h | ||
| bus_dma.h | ||
| bus.h | ||
| clock.h | ||
| cpu.h | ||
| cpufunc.h | ||
| db_machdep.h | ||
| dig64.h | ||
| efi.h | ||
| elf.h | ||
| endian.h | ||
| exec.h | ||
| float.h | ||
| floatingpoint.h | ||
| fpu.h | ||
| frame.h | ||
| gdb_machdep.h | ||
| ia64_cpu.h | ||
| ieee.h | ||
| ieeefp.h | ||
| in_cksum.h | ||
| intr.h | ||
| intrcnt.h | ||
| kdb.h | ||
| limits.h | ||
| mca.h | ||
| md_var.h | ||
| memdev.h | ||
| mutex.h | ||
| nexusvar.h | ||
| pal.h | ||
| param.h | ||
| pcb.h | ||
| pci_cfgreg.h | ||
| pcpu.h | ||
| pmap.h | ||
| pmc_mdep.h | ||
| proc.h | ||
| profile.h | ||
| pte.h | ||
| ptrace.h | ||
| reg.h | ||
| reloc.h | ||
| resource.h | ||
| runq.h | ||
| sal.h | ||
| sapicreg.h | ||
| sapicvar.h | ||
| setjmp.h | ||
| sf_buf.h | ||
| sigframe.h | ||
| signal.h | ||
| smp.h | ||
| stdarg.h | ||
| sysarch.h | ||
| ucontext.h | ||
| unwind.h | ||
| varargs.h | ||
| vmparam.h | ||