Date: Mon, 7 Oct 2019 18:24:41 +0200 From: Mateusz Guzik <mjguzik@gmail.com> To: Cy Schubert <Cy.Schubert@cschubert.com> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r353149 - head/sys/amd64/amd64 Message-ID: <CAGudoHH0vCjvR5rt_Qn2DSrVXxp23YyB61moTQZ=rt7kvDtnGw@mail.gmail.com> In-Reply-To: <201910071612.x97GCVx3003714@slippy.cwsent.com> References: <201910062213.x96MDZv3085523@repo.freebsd.org> <201910070406.x9746N0U009068@slippy.cwsent.com> <201910070419.x974JOkQ020574@slippy.cwsent.com> <CAGudoHFbuUgCrBa1JS6S5ynB_obpwBJdyRP66bd-WuhHO8ZP7A@mail.gmail.com> <201910071612.x97GCVx3003714@slippy.cwsent.com>
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Ok, looks ilke it does not like the sparse array for fictitious
mappings. I'll see about a patch.
On 10/7/19, Cy Schubert <cy.schubert@gmail.com> wrote:
> In message
> <CAGudoHFbuUgCrBa1JS6S5ynB_obpwBJdyRP66bd-WuhHO8ZP7A@mail.gmail.c
> om>
> , Mateusz Guzik writes:
>> Can you show:
>>
>> sysctl vm.phys_segso
>
> vm.phys_segs:
> SEGMENT 0:
>
> start: 0x10000
> end: 0x9d000
> domain: 0
> free list: 0xffffffff80f31070
>
> SEGMENT 1:
>
> start: 0x100000
> end: 0x1000000
> domain: 0
> free list: 0xffffffff80f31070
>
> SEGMENT 2:
>
> start: 0x1000000
> end: 0x1ca4000
> domain: 0
> free list: 0xffffffff80f30e00
>
> SEGMENT 3:
>
> start: 0x1cb3000
> end: 0x1ce3000
> domain: 0
> free list: 0xffffffff80f30e00
>
> SEGMENT 4:
>
> start: 0x1f00000
> end: 0x20000000
> domain: 0
> free list: 0xffffffff80f30e00
>
> SEGMENT 5:
>
> start: 0x20200000
> end: 0x40000000
> domain: 0
> free list: 0xffffffff80f30e00
>
> SEGMENT 6:
>
> start: 0x40203000
> end: 0xd4993000
> domain: 0
> free list: 0xffffffff80f30e00
>
> SEGMENT 7:
>
> start: 0xd6fff000
> end: 0xd7000000
> domain: 0
> free list: 0xffffffff80f30e00
>
> SEGMENT 8:
>
> start: 0x100001000
> end: 0x211d4d000
> domain: 0
> free list: 0xffffffff80f30e00
>
> SEGMENT 9:
>
> start: 0x21fc00000
> end: 0x21fd44000
> domain: 0
> free list: 0xffffffff80f30e00
>
>
>
>>
>> and from the crashdump:
>> p pv_table
>
> $1 = (struct pmap_large_md_page *) 0xfffffe000e000000
>
> kgdb) p *pv_table
> $1 = {pv_lock = {lock_object = {lo_name = 0xffffffff80b0a9ce "pmap pv
> list",
> lo_flags = 623050752, lo_data = 0, lo_witness = 0x800000000201f163},
> rw_lock = 1}, pv_page = {pv_list = {tqh_first = 0x0,
> tqh_last = 0xfffffe000e000020}, pv_gen = 0, pat_mode = 0},
> pv_invl_gen = 0}
> (kgdb)
>
>
> --
> Cheers,
> Cy Schubert <Cy.Schubert@cschubert.com>
> FreeBSD UNIX: <cy@FreeBSD.org> Web: http://www.FreeBSD.org
>
> The need of the many outweighs the greed of the few.
>
>
>>
>> On 10/7/19, Cy Schubert <Cy.Schubert@cschubert.com> wrote:
>> > In message <201910070406.x9746N0U009068@slippy.cwsent.com>, Cy Schubert
>> > writes:
>> >> In message <201910062213.x96MDZv3085523@repo.freebsd.org>, Mateusz
>> >> Guzik
>> >> writes
>> >> :
>> >> > Author: mjg
>> >> > Date: Sun Oct 6 22:13:35 2019
>> >> > New Revision: 353149
>> >> > URL: https://svnweb.freebsd.org/changeset/base/353149
>> >> >
>> >> > Log:
>> >> > amd64 pmap: implement per-superpage locks
>> >> >
>> >> > The current 256-lock sized array is a problem in the following
>> >> > ways:
>> >> > - it's way too small
>> >> > - there are 2 locks per cacheline
>> >> > - it is not NUMA-aware
>> >> >
>> >> > Solve these issues by introducing per-superpage locks backed by
>> >> > pages
>> >> > allocated from respective domains.
>> >> >
>> >> > This significantly reduces contention e.g. during poudriere -j
>> >> > 104.
>> >> > See the review for results.
>> >> >
>> >> > Reviewed by: kib
>> >> > Discussed with: jeff
>> >> > Sponsored by: The FreeBSD Foundation
>> >> > Differential Revision: https://reviews.freebsd.org/D21833
>> >> >
>> >> > Modified:
>> >> > head/sys/amd64/amd64/pmap.c
>> >> >
>> >> > Modified: head/sys/amd64/amd64/pmap.c
>> >> > ========================================================================
>> ===
>> >> ==
>> >> > =
>> >> > --- head/sys/amd64/amd64/pmap.c Sun Oct 6 20:36:25 2019 (r35314
>> >> > 8)
>> >> > +++ head/sys/amd64/amd64/pmap.c Sun Oct 6 22:13:35 2019 (r35314
>> >> > 9)
>> >> > @@ -316,13 +316,25 @@ pmap_pku_mask_bit(pmap_t pmap)
>> >> > #define PV_STAT(x) do { } while (0)
>> >> > #endif
>> >> >
>> >> > -#define pa_index(pa) ((pa) >> PDRSHIFT)
>> >> > +#undef pa_index
>> >> > +#define pa_index(pa) ({ \
>> >> > + KASSERT((pa) <= vm_phys_segs[vm_phys_nsegs - 1].end, \
>> >> > + ("address %lx beyond the last segment", (pa))); \
>> >> > + (pa) >> PDRSHIFT; \
>> >> > +})
>> >> > +#if VM_NRESERVLEVEL > 0
>> >> > +#define pa_to_pmdp(pa) (&pv_table[pa_index(pa)])
>> >> > +#define pa_to_pvh(pa) (&(pa_to_pmdp(pa)->pv_page))
>> >> > +#define PHYS_TO_PV_LIST_LOCK(pa) \
>> >> > + (&(pa_to_pmdp(pa)->pv_lock))
>> >> > +#else
>> >> > #define pa_to_pvh(pa) (&pv_table[pa_index(pa)])
>> >> >
>> >> > #define NPV_LIST_LOCKS MAXCPU
>> >> >
>> >> > #define PHYS_TO_PV_LIST_LOCK(pa) \
>> >> > (&pv_list_locks[pa_index(pa) % NPV_LIST_LOCKS])
>> >> > +#endif
>> >> >
>> >> > #define CHANGE_PV_LIST_LOCK_TO_PHYS(lockp, pa) do { \
>> >> > struct rwlock **_lockp = (lockp); \
>> >> > @@ -400,14 +412,22 @@ static int pmap_initialized;
>> >> >
>> >> > /*
>> >> > * Data for the pv entry allocation mechanism.
>> >> > - * Updates to pv_invl_gen are protected by the pv_list_locks[]
>> >> > - * elements, but reads are not.
>> >> > + * Updates to pv_invl_gen are protected by the pv list lock but
>> >> > reads
>> >> > are
>> >> no
>> >> > t.
>> >> > */
>> >> > static TAILQ_HEAD(pch, pv_chunk) pv_chunks =
>> >> > TAILQ_HEAD_INITIALIZER(pv_chu
>> >> nk
>> >> > s);
>> >> > static struct mtx __exclusive_cache_line pv_chunks_mutex;
>> >> > +#if VM_NRESERVLEVEL > 0
>> >> > +struct pmap_large_md_page {
>> >> > + struct rwlock pv_lock;
>> >> > + struct md_page pv_page;
>> >> > + u_long pv_invl_gen;
>> >> > +};
>> >> > +static struct pmap_large_md_page *pv_table;
>> >> > +#else
>> >> > static struct rwlock __exclusive_cache_line
>> >> > pv_list_locks[NPV_LIST_LOCKS];
>> >> > static u_long pv_invl_gen[NPV_LIST_LOCKS];
>> >> > static struct md_page *pv_table;
>> >> > +#endif
>> >> > static struct md_page pv_dummy;
>> >> >
>> >> > /*
>> >> > @@ -918,12 +938,21 @@ SYSCTL_LONG(_vm_pmap, OID_AUTO,
>> >> > invl_wait_slow,
>> >> > CTLFL
>> >> A
>> >> > "Number of slow invalidation waits for lockless DI");
>> >> > #endif
>> >> >
>> >> > +#if VM_NRESERVLEVEL > 0
>> >> > static u_long *
>> >> > pmap_delayed_invl_genp(vm_page_t m)
>> >> > {
>> >> >
>> >> > + return (&pa_to_pmdp(VM_PAGE_TO_PHYS(m))->pv_invl_gen);
>> >> > +}
>> >> > +#else
>> >> > +static u_long *
>> >> > +pmap_delayed_invl_genp(vm_page_t m)
>> >> > +{
>> >> > +
>> >> > return (&pv_invl_gen[pa_index(VM_PAGE_TO_PHYS(m)) % NPV_LIST_LO
>> CKS]);
>> >> > }
>> >> > +#endif
>> >> >
>> >> > static void
>> >> > pmap_delayed_invl_callout_func(void *arg __unused)
>> >> > @@ -1803,6 +1832,112 @@ pmap_page_init(vm_page_t m)
>> >> > m->md.pat_mode = PAT_WRITE_BACK;
>> >> > }
>> >> >
>> >> > +#if VM_NRESERVLEVEL > 0
>> >> > +static void
>> >> > +pmap_init_pv_table(void)
>> >> > +{
>> >> > + struct pmap_large_md_page *pvd;
>> >> > + vm_size_t s;
>> >> > + long start, end, highest, pv_npg;
>> >> > + int domain, i, j, pages;
>> >> > +
>> >> > + /*
>> >> > + * We strongly depend on the size being a power of two, so the
>> assert
>> >> > + * is overzealous. However, should the struct be resized to a
>> >> > + * different power of two, the code below needs to be revisited
>> .
>> >> > + */
>> >> > + CTASSERT((sizeof(*pvd) == 64));
>> >> > +
>> >> > + /*
>> >> > + * Calculate the size of the array.
>> >> > + */
>> >> > + pv_npg = howmany(vm_phys_segs[vm_phys_nsegs - 1].end, NBPDR);
>> >> > + s = (vm_size_t)pv_npg * sizeof(struct pmap_large_md_page);
>> >> > + s = round_page(s);
>> >> > + pv_table = (struct pmap_large_md_page *)kva_alloc(s);
>> >> > + if (pv_table == NULL)
>> >> > + panic("%s: kva_alloc failed\n", __func__);
>> >> > +
>> >> > + /*
>> >> > + * Iterate physical segments to allocate space for respective p
>> ages.
>> >> > + */
>> >> > + highest = -1;
>> >> > + s = 0;
>> >> > + for (i = 0; i < vm_phys_nsegs; i++) {
>> >> > + start = vm_phys_segs[i].start / NBPDR;
>> >> > + end = vm_phys_segs[i].end / NBPDR;
>> >> > + domain = vm_phys_segs[i].domain;
>> >> > +
>> >> > + if (highest >= end)
>> >> > + continue;
>> >> > +
>> >> > + if (start < highest) {
>> >> > + start = highest + 1;
>> >> > + pvd = &pv_table[start];
>> >> > + } else {
>> >> > + /*
>> >> > + * The lowest address may land somewhere in the
>> middle
>> >> > + * of our page. Simplify the code by pretending
>> it is
>> >> > + * at the beginning.
>> >> > + */
>> >> > + pvd = pa_to_pmdp(vm_phys_segs[i].start);
>> >> > + pvd = (struct pmap_large_md_page *)trunc_page(p
>> vd);
>> >> > + start = pvd - pv_table;
>> >> > + }
>> >> > +
>> >> > + pages = end - start + 1;
>> >> > + s = round_page(pages * sizeof(*pvd));
>> >> > + highest = start + (s / sizeof(*pvd)) - 1;
>> >> > +
>> >> > + for (j = 0; j < s; j += PAGE_SIZE) {
>> >> > + vm_page_t m = vm_page_alloc_domain(NULL, 0,
>> >> > + domain, VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ);
>> >> > + if (m == NULL)
>> >> > + panic("vm_page_alloc_domain failed for
>> %lx\n",
>> >> > (vm_offset_t)pvd + j);
>> >> > + pmap_qenter((vm_offset_t)pvd + j, &m, 1);
>> >> > + }
>> >> > +
>> >> > + for (j = 0; j < s / sizeof(*pvd); j++) {
>> >> > + rw_init_flags(&pvd->pv_lock, "pmap pv list", RW
>> _NEW);
>> >> > + TAILQ_INIT(&pvd->pv_page.pv_list);
>> >> > + pvd->pv_page.pv_gen = 0;
>> >> > + pvd->pv_page.pat_mode = 0;
>> >> > + pvd->pv_invl_gen = 0;
>> >> > + pvd++;
>> >> > + }
>> >> > + }
>> >> > + TAILQ_INIT(&pv_dummy.pv_list);
>> >> > +}
>> >> > +#else
>> >> > +static void
>> >> > +pmap_init_pv_table(void)
>> >> > +{
>> >> > + vm_size_t s;
>> >> > + long i, pv_npg;
>> >> > +
>> >> > + /*
>> >> > + * Initialize the pool of pv list locks.
>> >> > + */
>> >> > + for (i = 0; i < NPV_LIST_LOCKS; i++)
>> >> > + rw_init(&pv_list_locks[i], "pmap pv list");
>> >> > +
>> >> > + /*
>> >> > + * Calculate the size of the pv head table for superpages.
>> >> > + */
>> >> > + pv_npg = howmany(vm_phys_segs[vm_phys_nsegs - 1].end, NBPDR);
>> >> > +
>> >> > + /*
>> >> > + * Allocate memory for the pv head table for superpages.
>> >> > + */
>> >> > + s = (vm_size_t)pv_npg * sizeof(struct md_page);
>> >> > + s = round_page(s);
>> >> > + pv_table = (struct md_page *)kmem_malloc(s, M_WAITOK | M_ZERO);
>> >> > + for (i = 0; i < pv_npg; i++)
>> >> > + TAILQ_INIT(&pv_table[i].pv_list);
>> >> > + TAILQ_INIT(&pv_dummy.pv_list);
>> >> > +}
>> >> > +#endif
>> >> > +
>> >> > /*
>> >> > * Initialize the pmap module.
>> >> > * Called by vm_init, to initialize any structures that the pmap
>> >> > @@ -1813,8 +1948,7 @@ pmap_init(void)
>> >> > {
>> >> > struct pmap_preinit_mapping *ppim;
>> >> > vm_page_t m, mpte;
>> >> > - vm_size_t s;
>> >> > - int error, i, pv_npg, ret, skz63;
>> >> > + int error, i, ret, skz63;
>> >> >
>> >> > /* L1TF, reserve page @0 unconditionally */
>> >> > vm_page_blacklist_add(0, bootverbose);
>> >> > @@ -1902,26 +2036,7 @@ pmap_init(void)
>> >> > */
>> >> > mtx_init(&pv_chunks_mutex, "pmap pv chunk list", NULL, MTX_DEF)
>> ;
>> >> >
>> >> > - /*
>> >> > - * Initialize the pool of pv list locks.
>> >> > - */
>> >> > - for (i = 0; i < NPV_LIST_LOCKS; i++)
>> >> > - rw_init(&pv_list_locks[i], "pmap pv list");
>> >> > -
>> >> > - /*
>> >> > - * Calculate the size of the pv head table for superpages.
>> >> > - */
>> >> > - pv_npg = howmany(vm_phys_segs[vm_phys_nsegs - 1].end, NBPDR);
>> >> > -
>> >> > - /*
>> >> > - * Allocate memory for the pv head table for superpages.
>> >> > - */
>> >> > - s = (vm_size_t)(pv_npg * sizeof(struct md_page));
>> >> > - s = round_page(s);
>> >> > - pv_table = (struct md_page *)kmem_malloc(s, M_WAITOK | M_ZERO);
>> >> > - for (i = 0; i < pv_npg; i++)
>> >> > - TAILQ_INIT(&pv_table[i].pv_list);
>> >> > - TAILQ_INIT(&pv_dummy.pv_list);
>> >> > + pmap_init_pv_table();
>> >> >
>> >> > pmap_initialized = 1;
>> >> > for (i = 0; i < PMAP_PREINIT_MAPPING_COUNT; i++) {
>> >> >
>> >>
>> >> This causes a page fault during X (xdm) startup, which loads
>> >> drm-current-kmod.
>> >>
>> >> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
>> >> 0xfffffe0093e9c260
>> >> vpanic() at vpanic+0x19d/frame 0xfffffe0093e9c2b0
>> >> panic() at panic+0x43/frame 0xfffffe0093e9c310
>> >> vm_fault() at vm_fault+0x2126/frame 0xfffffe0093e9c460
>> >> vm_fault_trap() at vm_fault_trap+0x73/frame 0xfffffe0093e9c4b0
>> >> trap_pfault() at trap_pfault+0x1b6/frame 0xfffffe0093e9c510
>> >> trap() at trap+0x2a1/frame 0xfffffe0093e9c620
>> >> calltrap() at calltrap+0x8/frame 0xfffffe0093e9c620
>> >> --- trap 0xc, rip = 0xffffffff80a054b1, rsp = 0xfffffe0093e9c6f0, rbp
>> >> =
>> >> 0xfffffe0093e9c7a0 ---
>> >> pmap_enter() at pmap_enter+0x861/frame 0xfffffe0093e9c7a0
>> >> vm_fault() at vm_fault+0x1c69/frame 0xfffffe0093e9c8f0
>> >> vm_fault_trap() at vm_fault_trap+0x73/frame 0xfffffe0093e9c940
>> >> trap_pfault() at trap_pfault+0x1b6/frame 0xfffffe0093e9c9a0
>> >> trap() at trap+0x438/frame 0xfffffe0093e9cab0
>> >> calltrap() at calltrap+0x8/frame 0xfffffe0093e9cab0
>> >> --- trap 0xc, rip = 0x30e2a9c3, rsp = 0x7fffffffea50, rbp =
>> >> 0x7fffffffeaa0
>> >>
>> >> ---
>> >> Uptime: 3m33s
>> >> Dumping 945 out of 7974
>> >> MB:..2%..11%..21%..31%..41%..51%..61%..72%..82%..92%
>> >>
>> >> (kgdb) bt
>> >> #0 doadump (textdump=1) at pcpu_aux.h:55
>> >> #1 0xffffffff8068c5ed in kern_reboot (howto=260)
>> >> at /opt/src/svn-current/sys/kern/kern_shutdown.c:479
>> >> #2 0xffffffff8068caa9 in vpanic (fmt=<value optimized out>,
>> >> ap=<value optimized out>)
>> >> at /opt/src/svn-current/sys/kern/kern_shutdown.c:908
>> >> #3 0xffffffff8068c8a3 in panic (fmt=<value optimized out>)
>> >> at /opt/src/svn-current/sys/kern/kern_shutdown.c:835
>> >> #4 0xffffffff8098c966 in vm_fault (map=<value optimized out>,
>> >> vaddr=<value optimized out>, fault_type=<value optimized out>,
>> >> fault_flags=<value optimized out>, m_hold=<value optimized out>)
>> >> at /opt/src/svn-current/sys/vm/vm_fault.c:672
>> >> #5 0xffffffff8098a723 in vm_fault_trap (map=0xfffff80002001000,
>> >> vaddr=<value optimized out>, fault_type=2 '\002',
>> >> fault_flags=<value optimized out>, signo=0x0, ucode=0x0)
>> >> at /opt/src/svn-current/sys/vm/vm_fault.c:568
>> >> #6 0xffffffff80a18326 in trap_pfault (frame=0xfffffe0093e9c630,
>> >> signo=<value optimized out>, ucode=<value optimized out>)
>> >> at /opt/src/svn-current/sys/amd64/amd64/trap.c:828
>> >> #7 0xffffffff80a177f1 in trap (frame=0xfffffe0093e9c630)
>> >> at /opt/src/svn-current/sys/amd64/amd64/trap.c:407
>> >> #8 0xffffffff809f1aac in calltrap ()
>> >> at /opt/src/svn-current/sys/amd64/amd64/exception.S:289
>> >> ---Type <return> to continue, or q <return> to quit---
>> >> #9 0xffffffff80a054b1 in pmap_enter (pmap=<value optimized out>,
>> >> va=851443712, m=0xfffffe0005b25ce8, prot=<value optimized out>,
>> >> flags=2677542912, psind=<value optimized out>) at atomic.h:221
>> >> #10 0xffffffff8098c4a9 in vm_fault (map=<value optimized out>,
>> >> vaddr=<value optimized out>, fault_type=232 '\ufffd',
>> >> fault_flags=<value optimized out>, m_hold=0x0)
>> >> at /opt/src/svn-current/sys/vm/vm_fault.c:489
>> >> #11 0xffffffff8098a723 in vm_fault_trap (map=0xfffff80173eb5000,
>> >> vaddr=<value optimized out>, fault_type=2 '\002',
>> >> fault_flags=<value optimized out>, signo=0xfffffe0093e9ca84,
>> >> ucode=0xfffffe0093e9ca80) at
>> >> /opt/src/svn-current/sys/vm/vm_fault.c:568
>> >> #12 0xffffffff80a18326 in trap_pfault (frame=0xfffffe0093e9cac0,
>> >> signo=<value optimized out>, ucode=<value optimized out>)
>> >> at /opt/src/svn-current/sys/amd64/amd64/trap.c:828
>> >> #13 0xffffffff80a17988 in trap (frame=0xfffffe0093e9cac0)
>> >> at /opt/src/svn-current/sys/amd64/amd64/trap.c:347
>> >> #14 0xffffffff809f1aac in calltrap ()
>> >> at /opt/src/svn-current/sys/amd64/amd64/exception.S:289
>> >> #15 0x0000000030e2a9c3 in ?? ()
>> >> Previous frame inner to this frame (corrupt stack?)
>> >> Current language: auto; currently minimal
>> >> (kgdb) frame 9
>> >> #9 0xffffffff80a054b1 in pmap_enter (pmap=<value optimized out>,
>> >> va=851443712, m=0xfffffe0005b25ce8, prot=<value optimized out>,
>> >> flags=2677542912, psind=<value optimized out>) at atomic.h:221
>> >> 221 ATOMIC_CMPSET(long);
>> >> (kgdb) l
>> >> 216 }
>> >> 217
>> >> 218 ATOMIC_CMPSET(char);
>> >> 219 ATOMIC_CMPSET(short);
>> >> 220 ATOMIC_CMPSET(int);
>> >> 221 ATOMIC_CMPSET(long);
>> >> 222
>> >> 223 /*
>> >> 224 * Atomically add the value of v to the integer pointed to by p
>> and
>> >> return
>> >> 225 * the previous value of *p.
>> >> (kgdb)
>> >
>> > I should use kgdb from ports instead of /usr/libexec version. Similar
>> > result.
>> >
>> > <4>WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->
>> > lock))
>> > panic: vm_fault: fault on nofault entry, addr: 0xfffffe000e01c000
>> > cpuid = 1
>> > time = 1570417211
>> > KDB: stack backtrace:
>> > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
>> > 0xfffffe0093e9c260
>> > vpanic() at vpanic+0x19d/frame 0xfffffe0093e9c2b0
>> > panic() at panic+0x43/frame 0xfffffe0093e9c310
>> > vm_fault() at vm_fault+0x2126/frame 0xfffffe0093e9c460
>> > vm_fault_trap() at vm_fault_trap+0x73/frame 0xfffffe0093e9c4b0
>> > trap_pfault() at trap_pfault+0x1b6/frame 0xfffffe0093e9c510
>> > trap() at trap+0x2a1/frame 0xfffffe0093e9c620
>> > calltrap() at calltrap+0x8/frame 0xfffffe0093e9c620
>> > --- trap 0xc, rip = 0xffffffff80a054b1, rsp = 0xfffffe0093e9c6f0, rbp =
>> > 0xfffffe0093e9c7a0 ---
>> > pmap_enter() at pmap_enter+0x861/frame 0xfffffe0093e9c7a0
>> > vm_fault() at vm_fault+0x1c69/frame 0xfffffe0093e9c8f0
>> > vm_fault_trap() at vm_fault_trap+0x73/frame 0xfffffe0093e9c940
>> > trap_pfault() at trap_pfault+0x1b6/frame 0xfffffe0093e9c9a0
>> > trap() at trap+0x438/frame 0xfffffe0093e9cab0
>> > calltrap() at calltrap+0x8/frame 0xfffffe0093e9cab0
>> > --- trap 0xc, rip = 0x30e2a9c3, rsp = 0x7fffffffea50, rbp =
>> > 0x7fffffffeaa0
>> > ---
>> > Uptime: 3m33s
>> > Dumping 945 out of 7974
>> > MB:..2%..11%..21%..31%..41%..51%..61%..72%..82%..92%
>> >
>> > __curthread () at /opt/src/svn-current/sys/amd64/include/pcpu_aux.h:55
>> > 55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct pcp
>> u,
>> > (kgdb)
>> >
>> > Backtrace stopped: Cannot access memory at address 0x7fffffffea50
>> > (kgdb) frame 10
>> > #10 0xffffffff80a054b1 in atomic_fcmpset_long (dst=<optimized out>,
>> > src=<optimized out>, expect=<optimized out>)
>> > at /opt/src/svn-current/sys/amd64/include/atomic.h:221
>> > 221 ATOMIC_CMPSET(long);
>> > (kgdb) l
>> > 216 }
>> > 217
>> > 218 ATOMIC_CMPSET(char);
>> > 219 ATOMIC_CMPSET(short);
>> > 220 ATOMIC_CMPSET(int);
>> > 221 ATOMIC_CMPSET(long);
>> > 222
>> > 223 /*
>> > 224 * Atomically add the value of v to the integer pointed to by p and
>> > return
>> > 225 * the previous value of *p.
>> > (kgdb)
>> >
>> >
>> >
>> > --
>> > Cheers,
>> > Cy Schubert <Cy.Schubert@cschubert.com>
>> > FreeBSD UNIX: <cy@FreeBSD.org> Web: http://www.FreeBSD.org
>> >
>> > The need of the many outweighs the greed of the few.
>> >
>> >
>> >
>>
>>
>> --
>> Mateusz Guzik <mjguzik gmail.com>
>
>
>
>
>
--
Mateusz Guzik <mjguzik gmail.com>
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