Date: Mon, 21 May 2018 11:03:10 +0200 From: Roger Pau =?utf-8?B?TW9ubsOp?= <roger.pau@citrix.com> To: Pratyush Yadav <pratiy0100@gmail.com> Cc: <freebsd-xen@freebsd.org>, Akshay Jaggi <jaggi@freebsd.org>, Edward Napierala <trasz@freebsd.org> Subject: Re: Xen kernel fails to boot, d0v1 triple fault looks like the cuplrit Message-ID: <20180521090310.c46eexnwe4c7w62x@MacBook-Pro-de-Roger.local> In-Reply-To: <CA%2BX=3TKazXMk%2BUqL35Fzoa-F7YQWWtt-c6BSSNJQqL-WC31D1A@mail.gmail.com> References: <CA%2BX=3T%2BYiUmNNPSSA36QmwYsamgAf0hHEsEock-FcomCHc-Jww@mail.gmail.com> <20180519081030.qhzyjdrpwcekmcac@MacBook-Pro-de-Roger.local> <CA%2BX=3TKazXMk%2BUqL35Fzoa-F7YQWWtt-c6BSSNJQqL-WC31D1A@mail.gmail.com>
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On Sat, May 19, 2018 at 03:45:41PM +0530, Pratyush Yadav wrote:
> Hi,
>
> The line is
>
> /usr/src/sys/amd64/amd64/mp_machdep.c:307
Hm, it seems like dbg_stack is not properly allocated. Can you please
try the above debug patch and paste the boot log?
---8<---
diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c
index 301461420874..8854242b4bf5 100644
--- a/sys/amd64/amd64/mp_machdep.c
+++ b/sys/amd64/amd64/mp_machdep.c
@@ -304,6 +304,7 @@ init_secondary(void)
/* Save the per-cpu pointer for use by the DB# handler. */
np = ((struct nmi_pcpu *) &dbg_stack[PAGE_SIZE]) - 1;
+printf("ID %d dbg_stack: %p per-cpu: %p\n", cpu, dbg_stack, np);
np->np_pcpu = (register_t) pc;
wrmsr(MSR_FSBASE, 0); /* User value */
@@ -403,6 +404,7 @@ native_start_all_aps(void)
M_WAITOK | M_ZERO);
dbg_stack = (char *)kmem_malloc(kernel_arena, PAGE_SIZE,
M_WAITOK | M_ZERO);
+printf("allocated dbg_stack: %p\n", dbg_stack);
dpcpu = (void *)kmem_malloc(kernel_arena, DPCPU_SIZE,
M_WAITOK | M_ZERO);
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