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List:       freebsd-hackers
Subject:    Panic at (pickup) process
From:       rank1seeker () gmail ! com
Date:       2013-12-11 10:20:13
Message-ID: 20131211.102013.482.3 () DOMY-PC
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Yesterday I had a panic:

9.2-RELEASE-p2


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x2d
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc062e35d
stack pointer           = 0x28:0xd9d4aad4
frame pointer           = 0x28:0xd9d4ab04
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 2989 (pickup)
trap number             = 12
panic: page fault
Uptime: 5h2m15s
Physical memory: 502 MB
Dumping 67 MB: 52 36 20 4

No symbol "stopped_cpus" in current context.
No symbol "stoppcbs" in current context.

...

#0  doadump (textdump=1) at pcpu.h:249
249     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=1) at pcpu.h:249
#1  0xc065edaf in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:449
#2  0xc065efe1 in panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:637
#3  0xc08bb30a in trap_fatal (frame=0xd9d4aa94, eva=45)
    at /usr/src/sys/i386/i386/trap.c:1044
#4  0xc08bb3f1 in trap_pfault (frame=0xd9d4aa94, usermode=0, eva=45)
    at /usr/src/sys/i386/i386/trap.c:896
#5  0xc08bc0a0 in trap (frame=0xd9d4aa94) at 
/usr/src/sys/i386/i386/trap.c:555
#6  0xc08a94ec in calltrap () at /usr/src/sys/i386/i386/exception.s:170
#7  0xc062e35d in kqueue_close (fp=0xc3f1ea48, td=0xc3fb6000)
    at /usr/src/sys/kern/kern_event.c:1663
#8  0xc0621c86 in _fdrop (fp=0xc3f1ea48, td=0xc3fb6000) at file.h:334
#9  0xc062322d in closef (fp=0xc3f1ea48, td=0xc3fb6000)
    at /usr/src/sys/kern/kern_descrip.c:2303
#10 0xc0624334 in fdfree (td=0xc3fb6000)
    at /usr/src/sys/kern/kern_descrip.c:2007
#11 0xc0632d09 in exit1 (td=0xc3fb6000, rv=<value optimized out>)
    at /usr/src/sys/kern/kern_exit.c:301
#12 0xc0633afa in sys_sys_exit (td=Could not find the frame base for 
"sys_sys_exit".
) at /usr/src/sys/kern/kern_exit.c:122
#13 0xc08bb8bb in syscall (frame=0xd9d4ad08) at subr_syscall.c:135
#14 0xc08a9551 in Xint0x80_syscall ()
    at /usr/src/sys/i386/i386/exception.s:270
#15 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)


So I debugged ...
----
(kgdb) up 7
#7  0xc062e35d in kqueue_close (fp=0xc3f1ea48, td=0xc3fb6000) at 
/usr/src/sys/kern/kern_event.c:1663
1663            for (i = 0; i < kq->kq_knlistsize; i++) {
(kgdb) l
1658            fdp = kq->kq_fdp;
1659
1660            KASSERT(knlist_empty(&kq->kq_sel.si_note),
1661                ("kqueue's knlist not empty"));
1662
1663            for (i = 0; i < kq->kq_knlistsize; i++) {
1664                    while ((kn = SLIST_FIRST(&kq->kq_knlist[i])) != 
NULL) {
1665                            if ((kn->kn_status & KN_INFLUX) == 
KN_INFLUX) {
1666                                    kq->kq_state |= KQ_FLUXWAIT;
1667                                    msleep(kq, &kq->kq_lock, PSOCK, 
"kqclo1", 0);
(kgdb) x/i $eip
0xc062e35d <kqueue_close+187>:  testb  $0x10,0x2c(%ebx)
(kgdb) p kq
$1 = (struct kqueue *) 0xc3d62480
(kgdb) p *kq
$2 = {kq_lock = {lock_object = {lo_name = 0xc09224a8 "kqueue", lo_flags = 
21168128, lo_data = 0, lo_witness = 0x0}, mtx_lock = 3288031232}, 
kq_refcnt = 1, kq_list = {sle_next = 0x0}, kq_head = {
    tqh_first = 0x0, tqh_last = 0xc3d6249c}, kq_count = 0, kq_sel = 
{si_tdlist = {tqh_first = 0x0, tqh_last = 0x0}, si_note = {kl_list = 
{slh_first = 0x0}, kl_lock = 0xc062dd25 <knlist_mtx_lock>,
      kl_unlock = 0xc062dcdc <knlist_mtx_unlock>, kl_assert_locked = 
0xc062acdb <knlist_mtx_assert_locked>, kl_assert_unlocked = 0xc062ace0 
<knlist_mtx_assert_unlocked>, kl_lockarg = 0xc3d62480},
    si_mtx = 0x0}, kq_sigio = 0x0, kq_fdp = 0xc3714800, kq_state = 16, 
kq_knlistsize = 256, kq_knlist = 0xc358f000, kq_knhashmask = 0, kq_knhash 
= 0x0, kq_task = {ta_link = {stqe_next = 0x0},
    ta_pending = 0, ta_priority = 0, ta_func = 0xc062de5e <kqueue_task>, 
ta_context = 0xc3d62480}}
----


I have absolutely no idea what is going on here ....


Domagoj
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