On Tue, Dec 13, 2016 at 08:43:45PM +0300, Slawa Olhovchenkov wrote:
> On Tue, Dec 13, 2016 at 07:25:29PM +0200, Konstantin Belousov wrote:
>
> > This is not what I expected.
> > Also, I realized that I mis-read the memory test code. It does not
> > obliterate memory, old content is preserved.
> >
> > Please do exactly the same testing with another patch, at the end of the
> > message. There could be more output, up to 256 lines.
>
> No problem.
>
> Booting...
> KDB: debugger backends: ddb
> KDB: current backend: ddb
> SMAP type=01 base=0000000000000000 len=0000000000099c00
> SMAP type=02 base=0000000000099c00 len=0000000000006400
> SMAP type=02 base=00000000000e0000 len=0000000000020000
> SMAP type=01 base=0000000000100000 len=000000007906b000
> SMAP type=02 base=000000007916b000 len=0000000000936000
> SMAP type=04 base=0000000079aa1000 len=0000000000509000
> SMAP type=02 base=0000000079faa000 len=0000000002056000
> SMAP type=01 base=0000000100000000 len=0000001f80000000
> SMAP type=02 base=000000007c000000 len=0000000014000000
> SMAP type=02 base=00000000fed1c000 len=0000000000029000
> SMAP type=02 base=00000000ff000000 len=0000000001000000
> TTT1 0xfffff8207ff00000 0xfffff8207fffffb8 100000
> . 0
> . 1000
> . 2000
> . 3000
> . 4000
> . 5000
> . 6000
> . 7000
> . 8000
> . 9000
> . a000
> . b000
> . c000
> . d000
> . e000
> . f000
> . 10000
> . 11000
> . 12000
> . 13000
> . 14000
> . 15000
> . 16000
> . 17000
> . 18000
> . 19000
> . 1a000
> . 1b000
> . 1c000
> . 1d000
> . 1e000
> . 1f000
> . 20000
> . 21000
> . 22000
> . 23000
> . 24000
> . 25000
> . 26000
> . 27000
> . 28000
> . 29000
> . 2a000
> . 2b000
>
Do you still have access to the machine ?
If yes, please try this patch (against clean tree, as always) with the
same instructions as before.
diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c
index b2283339405..917ea4475f3 100644
--- a/sys/amd64/amd64/machdep.c
+++ b/sys/amd64/amd64/machdep.c
@@ -1673,6 +1673,14 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
/*
+ * Temporary forge some valid pointer to PCB, for exception
+ * handlers. It is reinitialized properly below after FPU is
+ * set up.
+ */
+ cpu_max_ext_state_size = sizeof(struct savefpu);
+ thread0.td_pcb = get_pcb_td(&thread0);
+
+ /*
* The console and kdb should be initialized even earlier than here,
* but some console drivers don't work until after getmemsize().
* Default to late console initialization to support these drivers.
diff --git a/sys/kern/subr_msgbuf.c b/sys/kern/subr_msgbuf.c
index f275aef3b4f..1be7a629f65 100644
--- a/sys/kern/subr_msgbuf.c
+++ b/sys/kern/subr_msgbuf.c
@@ -67,14 +67,19 @@ msgbuf_init(struct msgbuf *mbp, void *ptr, int size)
mbp->msg_ptr = ptr;
mbp->msg_size = size;
mbp->msg_seqmod = SEQMOD(size);
+printf("YYY1\n");
msgbuf_clear(mbp);
+printf("YYY2\n");
mbp->msg_magic = MSG_MAGIC;
mbp->msg_lastpri = -1;
mbp->msg_flags = 0;
+printf("YYY3\n");
bzero(&mbp->msg_lock, sizeof(mbp->msg_lock));
mtx_init(&mbp->msg_lock, "msgbuf", NULL, MTX_SPIN);
+printf("YYY4\n");
}
+
/*
* Reinitialize a message buffer, retaining its previous contents if
* the size and checksum are correct. If the old contents cannot be
@@ -85,8 +90,10 @@ msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size)
{
u_int cksum;
- if (mbp->msg_magic != MSG_MAGIC || mbp->msg_size != size) {
+ if (1 || mbp->msg_magic != MSG_MAGIC || mbp->msg_size != size) {
+printf("XXX1\n");
msgbuf_init(mbp, ptr, size);
+printf("XXX2\n");
return;
}
mbp->msg_seqmod = SEQMOD(size);
@@ -117,10 +124,12 @@ void
msgbuf_clear(struct msgbuf *mbp)
{
+printf("ZZZ1\n");
bzero(mbp->msg_ptr, mbp->msg_size);
mbp->msg_wseq = 0;
mbp->msg_rseq = 0;
mbp->msg_cksum = 0;
+printf("ZZZ2\n");
}
/*
diff --git a/sys/kern/subr_prf.c b/sys/kern/subr_prf.c
index e78863830c7..a72984dbc19 100644
--- a/sys/kern/subr_prf.c
+++ b/sys/kern/subr_prf.c
@@ -998,6 +998,14 @@ msgbufinit(void *ptr, int size)
char *cp;
static struct msgbuf *oldp = NULL;
+printf("TTT1 %p %p %x\n", ptr, (char *)ptr + size - sizeof(*msgbufp), size);
+for (int i = 0; i < size; i++) {
+if (i % PAGE_SIZE == 0) printf(". %x\n", i);
+ volatile char *c = (char *)ptr + i;
+ char tmp;
+ tmp = *c;
+ *c = tmp;
+}
size -= sizeof(*msgbufp);
cp = (char *)ptr;
msgbufp = (struct msgbuf *)(cp + size);
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