Author: cognet Date: Mon Feb 26 13:12:51 2018 New Revision: 330018 URL: https://svnweb.freebsd.org/changeset/base/330018
Log: In do_ast, make sure the interrupts are enabled before calling ast(). We can reach that point with IRQs disabled, and calling ast() with IRQs disabled can lead to a deadlock. This should fix the freezes on arm64 under load. Reviewed by: andrew Modified: head/sys/arm64/arm64/exception.S Modified: head/sys/arm64/arm64/exception.S ============================================================================== --- head/sys/arm64/arm64/exception.S Mon Feb 26 12:01:42 2018 (r330017) +++ head/sys/arm64/arm64/exception.S Mon Feb 26 13:12:51 2018 (r330018) @@ -26,6 +26,7 @@ */ #include <machine/asm.h> +#include <machine/armreg.h> __FBSDID("$FreeBSD$"); #include "assym.s" @@ -114,9 +115,11 @@ __FBSDID("$FreeBSD$"); .endm .macro do_ast - /* Disable interrupts */ mrs x19, daif + /* Make sure the IRQs are enabled before calling ast() */ + bic x19, x19, #PSR_I 1: + /* Disable interrupts */ msr daifset, #2 /* Read the current thread flags */ _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"