Backtraces posted here in hopes they might enlighten someone. 
This is with kernel source from June 6 (specifically,
"Sticky Date:   2001.06.06.22.16.24" according to cvs status).  The machine
is a dual PII/400; dmesg follows the backtraces from the two panics. If you
want more information from these two core files, please let me know.

Note that the first panic is somewhat muddled by the fact that, while 
syncing disks from the vm_object.c panic, it apparently paniced again with
"Giant locked" at i386/trap.c:1153.  That probably confuses the issue 
greatly.

P.S. Stupid -current question: How does one tell what process was running
that triggered a panic?  This used to be findable with "p *curproc" in
gdb, but that doesn't seem to work anymore.


Script started on Sat Jun  9 16:02:27 2001
You have mail.
ichotolot# gdb -k kernel.debug vmcore.19
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-unknown-freebsd"...
IdlePTD 6516736
initial pcb at 529440
panicstr: witness_restore: lock (sleep mutex) Giant not locked
panic messages:
---
panic: mutex Giant not owned at ../../vm/vm_object.c:261
cpuid = 1; lapic.id = 01000000
boot() called on cpu#1

syncing disks... exclusive (sleep mutex) Giant (0xc0576ca0) locked @ 
../../i386/i386/trap.c:1153
exclusive (spin mutex) sched lock (0xc05763e0) locked @ ../../kern/kern_mutex.c:312
panic: witness_restore: lock (sleep mutex) Giant not locked
cpuid = 1; lapic.id = 01000000
boot() called on cpu#1
Uptime: 2d2h35m38s

dumping to dev da0s2b, offset 270336
dump 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 
108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 
82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 
53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 
24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 
---
#0  dumpsys () at ../../kern/kern_shutdown.c:478
478             if (dumping++) {
(kgdb) p curproc
No symbol "curproc" in current context.
(kgdb) bt
#0  dumpsys () at ../../kern/kern_shutdown.c:478
#1  0xc026b35f in boot (howto=260) at ../../kern/kern_shutdown.c:321
#2  0xc026b7d1 in panic (fmt=0xc0488ae5 "%s: lock (%s) %s not locked")
    at ../../kern/kern_shutdown.c:600
#3  0xc02878a5 in witness_restore (lock=0xc0576ca0, 
    file=0xc048bc20 "../../kern/vfs_bio.c", line=1827)
    at ../../kern/subr_witness.c:1297
#4  0xc0273836 in msleep (ident=0xc054eaec, mtx=0x0, priority=68, 
    wmesg=0xc048c09e "psleep", timo=100) at ../../kern/kern_synch.c:500
#5  0xc02ab0a5 in buf_daemon () at ../../kern/vfs_bio.c:1883
#6  0xc025af78 in fork_exit (callout=0xc02aaf20 <buf_daemon>, arg=0x0, 
    frame=0xc80cbfa8) at ../../kern/kern_fork.c:727
(kgdb) fr 6
#6  0xc025af78 in fork_exit (callout=0xc02aaf20 <buf_daemon>, arg=0x0, 
    frame=0xc80cbfa8) at ../../kern/kern_fork.c:727
727             callout(arg, frame);
(kgdb) l
722              * cpu_set_fork_handler intercepts this function call to
723              * have this call a non-return function to stay in kernel mode.
724              * initproc has its own fork handler, but it does return.
725              */
726             KASSERT(callout != NULL, ("NULL callout in fork_exit"));
727             callout(arg, frame);
728     
729             /*
730              * Check if a kernel thread misbehaved and returned from its main
731              * function.
(kgdb) l
732              */
733             PROC_LOCK(p);
734             if (p->p_flag & P_KTHREAD) {
735                     PROC_UNLOCK(p);
736                     mtx_lock(&Giant);
737                     printf("Kernel thread \"%s\" (pid %d) exited prematurely.\n",
738                         p->p_comm, p->p_pid);
739                     kthread_exit(0);
740             }
741             PROC_UNLOCK(p);
(kgdb) p frame
$1 = (struct trapframe *) 0xc80cbfa8
(kgdb) p frame[0]
$2 = {tf_fs = 0, tf_es = 0, tf_ds = 0, tf_edi = 0, tf_esi = 0, tf_ebp = 0, 
  tf_isp = 0, tf_ebx = 0, tf_edx = 1, tf_ecx = 0, tf_eax = 0, tf_trapno = 0, 
  tf_err = 0, tf_eip = 0, tf_cs = 0, tf_eflags = 0, tf_esp = 0, tf_ss = 0}
(kgdb) fr 5
#5  0xc02ab0a5 in buf_daemon () at ../../kern/vfs_bio.c:1883
1883                            tsleep(&bd_request, PVM, "qsleep", hz / 2);
(kgdb) l
1878                            /*
1879                             * We couldn't find any flushable dirty buffers but
1880                             * still have too many dirty buffers, we
1881                             * have to sleep and try again.  (rare)
1882                             */
1883                            tsleep(&bd_request, PVM, "qsleep", hz / 2);
1884                    }
1885            }
1886    }
1887    
(kgdb) q
ichotolot# gdb -k kernel.debug vmcore.20
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-unknown-freebsd"...
IdlePTD 6516736
initial pcb at 529440
panicstr: mutex Giant not owned at ../../vm/vm_object.c:261
panic messages:
---
panic: mutex Giant not owned at ../../vm/vm_object.c:261
cpuid = 0; lapic.id = 00000000
boot() called on cpu#0

syncing disks... 191 191 191 191 191 191 191 191 191 191 191 191 191 191 191 191 191 
191 191 191 
1: dev:da0s2e, flags:31021024, blkno:1559744, lblkno:27
2: dev:da0s2e, flags:21000024, blkno:16, lblkno:16
3: dev:da1s1e, flags:21000024, blkno:16, lblkno:16
4: dev:da0s2e, flags:01000024, blkno:15597616, lblkno:15597616
5: dev:da0s2e, flags:21021024, blkno:14221408, lblkno:14221408
6: dev:da0s2e, flags:31021024, blkno:1626976, lblkno:263
7: dev:da0s2e, flags:21021024, blkno:15598368, lblkno:15598368
8: dev:da0s2e, flags:31021024, blkno:1587520, lblkno:167
9: dev:da0s2e, flags:31021024, blkno:1560272, lblkno:2
10: dev:da0s2e, flags:21021024, blkno:15532128, lblkno:15532128
11: dev:da0s2e, flags:21000024, blkno:2048, lblkno:2048
12: dev:da1s1e, flags:200210a0, blkno:5114176, lblkno:-12
13: dev:da0s2e, flags:21021024, blkno:403004, lblkno:0
14: dev:da0s2e, flags:21021024, blkno:457724, lblkno:0
15: dev:da0s2e, flags:31021024, blkno:1587888, lblkno:279
16: dev:da0s2e, flags:21021024, blkno:1858544, lblkno:2106
17: dev:da0s2e, flags:31021024, blkno:1585376, lblkno:314
18: dev:da0s2e, flags:31021024, blkno:1560624, lblkno:284
19: dev:da1s1e, flags:01000024, blkno:5570608, lblkno:5570608
20: dev:da1s1e, flags:21000024, blkno:2048, lblkno:2048
21: dev:da0s2e, flags:21021024, blkno:401024, lblkno:0
22: dev:da0s2e, flags:21021024, blkno:1507584, lblkno:1507584
23: dev:da0s2e, flags:21021024, blkno:15598352, lblkno:15598352
24: dev:da0s2e, flags:21021024, blkno:406720, lblkno:0
25: dev:da0s2e, flags:31021024, blkno:1581360, lblkno:68
26: dev:da0s2e, flags:21021024, blkno:2294560, lblkno:2294560
27: dev:da0s2e, flags:21021024, blkno:412304, lblkno:0
28: dev:da0s2e, flags:21021024, blkno:409440, lblkno:0
29: dev:da0s2e, flags:21021024, blkno:457776, lblkno:0
30: dev:da0s2e, flags:21021024, blkno:401370, lblkno:0
31: dev:da0s2e, flags:01000024, blkno:393264, lblkno:393264
32: dev:da1s1e, flags:21000024, blkno:2064, lblkno:2064
giving up on 32 buffers
Uptime: 10h17m33s

dumping to dev da0s2b, offset 270336
dump 128 [CTRL-C to abort] [CTRL-C to abort] [CTRL-C to abort] 127 126 125 124 123 122 
121 [CTRL-C to abort] [CTRL-C to abort] 120 [CTRL-C to abort] 119 118 117 116 115 114 
113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 
89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 
---
#0  dumpsys () at ../../kern/kern_shutdown.c:478
478             if (dumping++) {
(kgdb) bt
#0  dumpsys () at ../../kern/kern_shutdown.c:478
#1  0xc026b35f in boot (howto=256) at ../../kern/kern_shutdown.c:321
#2  0xc026b7d1 in panic (fmt=0xc0484808 "mutex %s not owned at %s:%d")
    at ../../kern/kern_shutdown.c:600
#3  0xc0263c25 in _mtx_assert (m=0xc0576ca0, what=1, 
    file=0xc04ab834 "../../vm/vm_object.c", line=261)
    at ../../kern/kern_mutex.c:567
#4  0xc03f0fee in vm_object_reference (object=0xc8bbc1e0)
    at ../../vm/vm_object.c:261
#5  0xc03d6872 in ffs_write (ap=0xc8ce0e80)
    at ../../ufs/ufs/ufs_readwrite.c:421
#6  0xc025e175 in ktrwrite (vp=0xc8b67680, kth=0xc112df00, uio=0x0)
    at vnode_if.h:303
#7  0xc025dadb in ktrpsig (vp=0xc8b67680, sig=6, action=0, mask=0xc8b24090, 
    code=0) at ../../kern/kern_ktrace.c:202
#8  0xc0270204 in postsig (sig=6) at ../../kern/kern_sig.c:1542
#9  0xc042983e in userret (p=0xc8b23ee0, frame=0xc8ce0fa8, oticks=2655)
    at ../../i386/i386/trap.c:175
#10 0xc042c603 in ast (framep=0xc8ce0fa8) at ../../i386/i386/trap.c:1320
#11 0xc0417b00 in doreti_ast ()
#12 0x80527c7 in ?? ()
#13 0x804ea6d in ?? ()
#14 0x8052974 in ?? ()
#15 0x80520c8 in ?? ()
#16 0x804d340 in ?? ()
#17 0x804e176 in ?? ()
#18 0x8049eb1 in ?? ()
(kgdb) fr 10
#10 0xc042c603 in ast (framep=0xc8ce0fa8) at ../../i386/i386/trap.c:1320
1320            userret(p, framep, sticks);
(kgdb) p *p
$1 = {p_procq = {tqe_next = 0x0, tqe_prev = 0xc0529718}, p_slpq = {
    tqe_next = 0x0, tqe_prev = 0xc05297f8}, p_list = {le_next = 0xc8b23220, 
    le_prev = 0xc8d66db0}, p_ucred = 0xc124cc00, p_fd = 0xc10e3300, 
  p_stats = 0xc8cdfb74, p_limit = 0xc117eb00, p_upages_obj = 0xc8cdd180, 
  p_procsig = 0xc11d0340, p_flag = 16384, p_sflag = 2049, p_stat = 2, 
  p_pid = 27587, p_hash = {le_next = 0x0, le_prev = 0xc0b3bf0c}, p_pglist = {
    le_next = 0x0, le_prev = 0xc10ff5a8}, p_pptr = 0xc7acac80, p_sibling = {
    le_next = 0xc8b24760, le_prev = 0xc7acacdc}, p_children = {
    lh_first = 0x0}, p_oppid = 0, p_dupfd = 0, p_vmspace = 0xc8b1c180, 
  p_estcpu = 295, p_cpticks = 451, p_pctcpu = 1049, p_slpcallout = {c_links = {
      sle = {sle_next = 0x0}, tqe = {tqe_next = 0x0, tqe_prev = 0x0}}, 
    c_time = 0, c_arg = 0x0, c_func = 0, c_flags = 8}, p_wchan = 0x0, 
  p_wmesg = 0xc048c1a1 "getblk", p_swtime = 36, p_slptime = 0, p_itcallout = {
    c_links = {sle = {sle_next = 0x0}, tqe = {tqe_next = 0x0, 
        tqe_prev = 0x0}}, c_time = 0, c_arg = 0x0, c_func = 0, c_flags = 0}, 
  p_realtimer = {it_interval = {tv_sec = 0, tv_usec = 0}, it_value = {
      tv_sec = 0, tv_usec = 0}}, p_runtime = 30433876, p_uu = 0, p_su = 0, 
  p_iu = 0, p_uticks = 7, p_sticks = 3089, p_iticks = 0, 
  p_traceflag = -536870722, p_tracep = 0xc8b67680, p_siglist = {__bits = {0, 
      0, 0, 0}}, p_textvp = 0xc8b7da40, p_mtx = {mtx_object = {
      lo_class = 0xc04f81e0, lo_name = 0xc0482f48 "process lock", 
      lo_flags = 196608, lo_list = {stqe_next = 0xc124cc68}, 
      lo_witness = 0xc052be00}, mtx_lock = 3367124704, mtx_recurse = 0, 
    mtx_savecrit = 0, mtx_blocked = {tqh_first = 0x0, tqh_last = 0xc8b2401c}, 
    mtx_contested = {le_next = 0x0, le_prev = 0x0}}, p_spinlocks = 1, 
  p_lock = 0 '\000', p_oncpu = 0 '\000', p_lastcpu = 0 '\000', 
  p_rqindex = 54 '6', p_locks = -32, p_stops = 0, p_stype = 0, 
  p_step = 0 '\000', p_pfsflags = 0 '\000', p_pad3 = "\000", p_retval = {0, 
    134625376}, p_sigiolst = {slh_first = 0x0}, p_sigparent = 20, 
  p_oldsigmask = {__bits = {0, 0, 0, 0}}, p_sig = 0, p_code = 0, p_klist = {
    slh_first = 0x0}, p_sleeplocks = 0xc054e930, p_blocked = 0x0, 
  p_mtxname = 0xc04aa634 "vm", p_contested = {lh_first = 0x0}, 
  p_nlminfo = 0x0, p_aioinfo = 0x0, p_ithd = 0x0, p_intr_nesting_level = 0, 
  p_sigmask = {__bits = {0, 0, 0, 0}}, p_sigstk = {ss_sp = 0x0, ss_size = 0, 
    ss_flags = 4}, p_magic = -1091568946, p_pri = {pri_class = 3 '\003', 
    pri_level = 216 '', pri_native = 193 '', pri_user = 216 ''}, 
  p_nice = 0 '\000', 
  p_comm = "telnet\000\000\000\000\000\000\000\000\000\000", 
  p_pgrp = 0xc10ff5a0, p_sysent = 0xc04f4780, p_args = 0xc10ff540, 
  p_addr = 0xc8cdf000, p_md = {md_regs = 0xc8ce0fa8}, p_xstat = 0, 
  p_acflag = 0, p_ru = 0x0, p_peers = 0x0, p_leader = 0xc8b23ee0, p_asleep = {
    as_priority = 0, as_timo = 0}, p_emuldata = 0x0}
(kgdb) q
ichotolot# dmesg
Copyright (c) 1992-2001 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.0-CURRENT #30: Wed Jun  6 20:35:34 CDT 2001
    [EMAIL PROTECTED]:/usr/src/sys/compile/ICHOTOLOTSMP
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium II/Pentium II Xeon/Celeron (400.91-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x653  Stepping = 3
  
Features=0x183fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
real memory  = 134217728 (131072K bytes)
avail memory = 124346368 (121432K bytes)
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): apic id:  0, version: 0x00040011, at 0xfee00000
 cpu1 (AP):  apic id:  1, version: 0x00040011, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x00170011, at 0xfec00000
Preloaded elf kernel "kernel" at 0xc0618000.
Pentium Pro MTRR support enabled
WARNING: Driver mistake: destroy_dev on 154/0
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Intel 82443GX host to PCI bridge> at pcibus 0 on motherboard
IOAPIC #0 intpin 19 -> irq 2
IOAPIC #0 intpin 16 -> irq 10
pci0: <PCI bus> on pcib0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <display, VGA> at 0.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0xffa0-0xffaf at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0xef80-0xef9f irq 2 at device 
7.2 on pci0
usb0: <Intel 82371AB/EB (PIIX4) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ums0: Cypress Sem PS2/USB Browser Combo Mouse, rev 1.00/4.9c, addr 2, iclass 3/1
ums0: 5 buttons and Z dir.
Timecounter "PIIX"  frequency 3579545 Hz
pci0: <bridge, PCI-unknown> at 7.3 (no driver attached)
pcib2: <PCI-PCI bridge> at device 16.0 on pci0
pci2: <PCI bus> on pcib2
fxp0: <Intel Pro 10/100B/100+ Ethernet> port 0xef40-0xef5f mem 
0xfea00000-0xfeafffff,0xfc4ff000-0xfc4fffff irq 2 at device 17.0 on pci0
fxp0: Ethernet address 00:e0:81:10:47:b2
inphy0: <i82555 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
ahc0: <Adaptec aic7895 Ultra SCSI adapter> port 0xe400-0xe4ff mem 
0xfebfe000-0xfebfefff irq 10 at device 18.0 on pci0
aic7895C: Ultra Wide Channel A, SCSI Id=7, 32/255 SCBs
ahc1: <Adaptec aic7895 Ultra SCSI adapter> port 0xe800-0xe8ff mem 
0xfebff000-0xfebfffff irq 10 at device 18.1 on pci0
aic7895C: Ultra Wide Channel B, SCSI Id=7, 32/255 SCBs
orm0: <Option ROMs> at iomem 0xc0000-0xc87ff,0xcc000-0xd07ff on isa0
sc0: <System console> on isa0
sc0: VGA <16 virtual consoles, flags=0x200>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: Generic chipset (EPP/NIBBLE) in COMPATIBLE mode
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
sbc0: <Creative ViBRA16X> at port 0x220-0x22f,0x330-0x331,0x388-0x38b irq 5 drq 1,3 on 
isa0
pcm0: <SB16 DSP 4.16 (ViBRA16X)> on sbc0
unknown: <PNP0303> can't assign resources
unknown: <PNP0c02> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0400> can't assign resources
unknown: <PNP0700> can't assign resources
APIC_IO: Testing 8254 interrupt delivery
APIC_IO: routing 8254 via IOAPIC #0 intpin 2
DUMMYNET initialized (010124)
IP packet filtering initialized, divert disabled, rule-based forwarding disabled, 
default to deny, logging disabled
IPsec: Initialized Security Association Processing.
Waiting 15 seconds for SCSI devices to settle
sa0 at ahc0 bus 0 target 0 lun 0
sa0: <SONY SDT-7000 0300> Removable Sequential Access SCSI-2 device 
sa0: 10.000MB/s transfers (10.000MHz, offset 15)
da0 at ahc1 bus 0 target 2 lun 0
da0: <QUANTUM ATLAS IV 9 WLS 0707> Fixed Direct Access SCSI-3 device 
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da0: 8761MB (17942584 512 byte sectors: 255H 63S/T 1116C)
da1 at ahc1 bus 0 target 4 lun 0
da1: <QUANTUM ATLAS_V_18_WLS 0230> Fixed Direct Access SCSI-3 device 
da1: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da1: 17510MB (35861388 512 byte sectors: 255H 63S/T 2232C)
Mounting root from ufs:/dev/da0s2a
cd0 at ahc0 bus 0 target 3 lun 0
cd0: <YAMAHA CRW8424S 1.0g> Removable CD-ROM SCSI-2 device 
cd0: 20.000MB/s transfers (20.000MHz, offset 15)
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed
WARNING: / was not properly dismounted
SMP: AP CPU #1 Launched!
lock order reversal
 1st 0xc0569940 mntvnode @ ../../ufs/ffs/ffs_vfsops.c:478
 2nd 0xc80c2c8c vnode interlock @ ../../kern/vfs_subr.c:1926
ichotolot# exit
exit

Script done on Sat Jun  9 16:06:50 2001


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