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Date:      Fri, 20 Feb 2015 16:22:21 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 197503] Kernel panic during wake up from suspend to ram (pmap_copy)
Message-ID:  <bug-197503-8-J9DD1nPiy7@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-197503-8@https.bugs.freebsd.org/bugzilla/>
References:  <bug-197503-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197503

--- Comment #1 from Danilo Egea Gondolfo <danilo@FreeBSD.org> ---
Again, on ZFS this time:

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address    = 0x38
fault code        = supervisor read data, page not present
instruction pointer    = 0x20:0xffffffff81273f23
stack pointer            = 0x28:0xfffffe01202a0980
frame pointer            = 0x28:0xfffffe01202a09b0
code segment        = base 0x0, limit 0xfffff, type 0x1b
            = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags    = interrupt enabled, resume, IOPL = 0
current process        = 5 (arc_reclaim_thread)

(kgdb) bt
#0  doadump (textdump=Unhandled dwarf expression opcode 0x93
) at pcpu.h:219
#1  0xffffffff8031adee in db_dump (dummy=<value optimized out>,
dummy2=Unhandled dwarf expression opcode 0x93
) at /usr/src/sys/ddb/db_command.c:533
#2  0xffffffff8031a8cc in db_command (cmd_table=0x0) at
/usr/src/sys/ddb/db_command.c:440
#3  0xffffffff8031a634 in db_command_loop () at
/usr/src/sys/ddb/db_command.c:493
#4  0xffffffff8031d1f0 in db_trap (type=<value optimized out>, code=Unhandled
dwarf expression opcode 0x93
) at /usr/src/sys/ddb/db_main.c:251
#5  0xffffffff806724ee in kdb_trap (type=Unhandled dwarf expression opcode 0x93
) at /usr/src/sys/kern/subr_kdb.c:654
#6  0xffffffff8096d469 in trap_fatal (frame=0xfffffe01202a08d0, eva=<value
optimized out>) at /usr/src/sys/amd64/amd64/trap.c:856
#7  0xffffffff8096d7e1 in trap_pfault (frame=0xfffffe01202a08d0,
usermode=<value optimized out>)
    at /usr/src/sys/amd64/amd64/trap.c:678
#8  0xffffffff8096ce1e in trap (frame=0xfffffe01202a08d0) at
/usr/src/sys/amd64/amd64/trap.c:426
#9  0xffffffff80950472 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:235
#10 0xffffffff81273f23 in dbuf_destroy (db=0xfffff80107f000e0) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dbuf.c:1826
#11 0xffffffff812786b1 in dbuf_do_evict (private=<value optimized out>)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dbuf.c:1792
#12 0xffffffff8126bc61 in arc_do_user_evicts () at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c:2484
#13 0xffffffff8126f1bf in arc_reclaim_thread (dummy=0x0) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c:2785
#14 0xffffffff805f42ca in fork_exit (callout=0xffffffff8126ef90
<arc_reclaim_thread>, arg=0x0, frame=0xfffffe01202a0ac0)
    at /usr/src/sys/kern/kern_fork.c:996
#15 0xffffffff809509ae in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:610
#16 0x0000000000000000 in ?? ()

(kgdb) frame 10
#10 0xffffffff81273f23 in dbuf_destroy (db=0xfffff80107f000e0) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dbuf.c:1826
1826            dbuf_hash_remove(db);

(kgdb) p *db
$1 = {db = {db_object = 4593513014824267775, db_offset = 18446744071562051071,
db_size = 17255535289300942782, db_data = 0x0}, 
  db_objset = 0xfffff80007474c00, db_dnode_handle = 0x0, db_parent =
0xfffff8010baf9380, db_hash_next = 0x0, db_blkid = 0, 
  db_blkptr = 0x0, db_level = 0 '\0', db_mtx = {lock_object = {lo_name =
0xffffffff8137234d "db->db_mtx", lo_flags = 40960000, 
      lo_data = 0, lo_witness = 0x0}, sx_lock = 1}, db_state = DB_EVICTING,
db_holds = {rc_count = 0}, db_buf = 0x0, db_changed = {
    cv_description = 0xffffffff81372359 "db->db_changed", cv_waiters = 0},
db_data_pending = 0x0, db_last_dirty = 0x0, db_link = {
    avl_child = {0x0, 0x0}, avl_pcb = 1}, db_user_ptr = 0x0, db_evict_func = 0,
db_immediate_evict = 0 '\0', 
  db_freed_in_flight = 0 '\0', db_dirtycnt = 0 '\0'}

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