* Neil Horman <nhorman at tuxdriver.com> wrote: > Hey all- > Theres a corner case in 32 bit x86 kdump at the moment. When > the box panics via nmi, we call bust_spinlocks(1) to disable > sensitivity to the console_sem (allowing us to print to the console in > all cases), but we don't call crash_kexec, until after we call > bust_spinlocks(0), which re-enables console_sem sensitivity. The > result is that, if we get an nmi while the console_sem is held and > kdump is configured, and we try to print something to the console > during kdump shutdown (which we often do) we deadlock the box. The > fix is to simply do what 64 bit die_nmi does which is to not call > bust_spinlocks(0) until after we call crash_kexec. Patch below tested > successfully by me: applied to tip/x86/urgent, thanks Neil! > dumpstack_32.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) would be nice to unify this code some more - to create a new arch/x86/kernel/dumpstack.c and fill it in with die_nmi() as a beginning? Ingo
