On Fri, 12-Jul-2013 at 08:01:12 +0200, Konstantin Belousov wrote:
> On Fri, Jul 12, 2013 at 07:24:40AM +0200, Andre Albsmeier wrote:
> > On Thu, 04-Jul-2013 at 19:25:28 +0200, Konstantin Belousov wrote:
> > > On Thu, Jul 04, 2013 at 04:29:19PM +0200, Andre Albsmeier wrote:
> > > > OK, patch is applied. I will reboot the machine later
> > > > and see what happens tomorrow in the morning. However,
> > > > it might take a few days since the last 2 weeks all was
> > > > fine.
> > > >
> > > > BTW, should this patch be used in general or is it just
> > > > for debugging? My understanding is that it is something
> > > > which could stay in the code...
> > >
> > > Patch is to improve debugging.
> > >
> > > I probably commit it after the issue is closed. Arguments against
> > > the commit is that the change imposes small performance penalty
> > > due to save and restore of the %ebp (I doubt that this is measureable
> > > by any means). Also, arguably, such change should be done for all
> > > functions in support.s, but bcopy() is the hot spot.
> >
> > Got a new one, 2 hours old ;-)
> >
> > GNU gdb 6.1.1 [FreeBSD]
> > Copyright 2004 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-marcel-freebsd"...
> >
> > Unread portion of the kernel message buffer:
> >
> >
> > Fatal trap 12: page fault while in kernel mode
> > fault virtual address = 0xcd5ec000
> > fault code = supervisor write, page not present
> > instruction pointer = 0x20:0xc07cb2fe
> > stack pointer = 0x28:0xd82e45cc
> > frame pointer = 0x28:0xd82e45d4
> > 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 = 18714 (mksnap_ffs)
> > trap number = 12
> > panic: page fault
> > KDB: stack backtrace:
> > db_trace_self_wrapper(c08207eb,d82e4418,c05fdfc9,c081df13,c08a82e0,...) at
> > db_trace_self_wrapper+0x26/frame 0xd82e43e8
> > kdb_backtrace(c081df13,c08a82e0,c0801bfa,d82e4424,d82e4424,...) at
> > kdb_backtrace+0x29/frame 0xd82e43f4
> > panic(c0801bfa,c0845a01,c2b067d4,1,1,...) at panic+0xc9/frame 0xd82e4418
> > trap_fatal(c0ff6000,cd5ec000,2,0,c08b6bf4,...) at trap_fatal+0x353/frame
> > 0xd82e4458
> > trap_pfault(baa8454b,21510,0,c2b06620,c08b6bf0,...) at
> > trap_pfault+0x2d7/frame 0xd82e44a0
> > trap(d82e458c) at trap+0x41a/frame 0xd82e4580
> > calltrap() at calltrap+0x6/frame 0xd82e4580
> > --- trap 0xc, eip = 0xc07cb2fe, esp = 0xd82e45cc, ebp = 0xd82e45d4 ---
> > bcopy(c36ed000,cd5e6000,8000,8000,c281b980,...) at bcopy+0x1a/frame
> > 0xd82e45d4
> > ffs_snapshot(c2b35a90,c2ed0400,0,0,0,...) at ffs_snapshot+0x2933/frame
> > 0xd82e490c
> > ffs_mount(c2b35a90,c322e200,ff,d82e4c08,c2ccbc8c,...) at
> > ffs_mount+0x15ee/frame 0xd82e4a3c
> > vfs_donmount(c2b06620,10313108,0,c2b74d80,c2b74d80,...) at
> > vfs_donmount+0x196b/frame 0xd82e4c2c
> > sys_nmount(c2b06620,d82e4ccc,c2b06908,d82e4c6c,c0605015,...) at
> > sys_nmount+0x63/frame 0xd82e4c50
> > syscall(d82e4d08) at syscall+0x2ce/frame 0xd82e4cfc
> > Xint0x80_syscall() at Xint0x80_syscall+0x21/frame 0xd82e4cfc
> > --- syscall (378, FreeBSD ELF32, sys_nmount), eip = 0x180bdf37, esp =
> > 0xbfbfd65c, ebp = 0xbfbfddd8 ---
> > Uptime: 4d20h0m44s
> > Physical memory: 503 MB
> > Dumping 104 MB: 89 73 57 41 25 9
> >
> > 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) where
> > #0 doadump (textdump=1) at pcpu.h:249
> > #1 0xc05fdddd in kern_reboot (howto=260) at
> > /src/src-9/sys/kern/kern_shutdown.c:449
> > #2 0xc05fe028 in panic (fmt=<value optimized out>) at
> > /src/src-9/sys/kern/kern_shutdown.c:637
> > #3 0xc07cd1d3 in trap_fatal (frame=0xd82e458c, eva=3445538816)
> > at /src/src-9/sys/i386/i386/trap.c:1044
> > #4 0xc07cd4b7 in trap_pfault (frame=0xd82e458c, usermode=0, eva=3445538816)
> > at /src/src-9/sys/i386/i386/trap.c:957
> > #5 0xc07ce05a in trap (frame=0xd82e458c) at
> > /src/src-9/sys/i386/i386/trap.c:555
> > #6 0xc07ba88c in calltrap () at /src/src-9/sys/i386/i386/exception.s:170
> > #7 0xc07cb2fe in bcopy () at /src/src-9/sys/i386/i386/support.s:198
> > #8 0xc072be13 in ffs_snapshot (mp=0xc2b35a90, snapfile=0xc2ed0400
> > "s5-2013.07.12-03.15.01")
> > at /src/src-9/sys/ufs/ffs/ffs_snapshot.c:793
> > #9 0xc0748e8e in ffs_mount (mp=0xc2b35a90) at
> > /src/src-9/sys/ufs/ffs/ffs_vfsops.c:483
> > #10 0xc068a72b in vfs_donmount (td=0xc2b06620, fsflags=271659272,
> > fsoptions=0xc2b74d80)
> > at /src/src-9/sys/kern/vfs_mount.c:948
> > #11 0xc068a8e3 in sys_nmount (td=0xc2b06620, uap=0xd82e4ccc) at
> > /src/src-9/sys/kern/vfs_mount.c:417
> > #12 0xc07cd7ae in syscall (frame=0xd82e4d08) at subr_syscall.c:135
> > #13 0xc07ba8f1 in Xint0x80_syscall () at
> > /src/src-9/sys/i386/i386/exception.s:270
> > #14 0x00000033 in ?? ()
> > Previous frame inner to this frame (corrupt stack?)
>
> Please show me the first 100 lines of the output of dumpfs(8) on the
> filesystem where snapshot creation caused the panic.
OK, dumpfs /dev/stripe/p | head -100:
magic 11954 (UFS1) time Fri Jul 12 08:02:40 2013
id [ 517fa356 4ecc9335 ]
ncg 82 size 17774144 blocks 17737399
bsize 32768 shift 15 mask 0xffff8000
fsize 4096 shift 12 mask 0xfffff000
frag 8 shift 3 fsbtodb 3
minfree 8% optim time symlinklen 60
maxbpg 4096 maxcontig 4 contigsumsize 4
nbfree 1958555 ndir 695 nifree 1123668 nffree 5395
cpg 1 bpg 27415 fpg 219320 ipg 13824
nindir 8192 inopb 256 nspf 8 maxfilesize
18016597801566207
sbsize 4096 cgsize 32768 cgoffset 0 cgmask 0xffffffff
csaddr 456 cssize 4096
rotdelay 0ms rps 60 trackskew 0 interleave 1
nsect 1754560 npsect 1754560 spc 1754560
sblkno 8 cblkno 16 iblkno 24 dblkno 456
cgrotor 50 fmod 0 ronly 0 clean 0
metaspace 0 avgfpdir 64 avgfilesize 16384
flags soft-updates
fsmnt /palveli
volname swuid 0 providersize 17774144
cs[].cs_(nbfree,ndir,nifree,nffree):
(6,43,12636,563) (0,82,12780,534) (0,21,13512,313) (10299,81,12257,612)
(18212,74,13467,297) (9782,206,10086,2351) (0,115,12467,419)
(0,0,13824,2)
(25472,73,13487,275) (0,0,13824,13) (23074,0,13824,0) (27335,0,13824,0)
(27359,0,13824,0) (0,0,13824,9) (27268,0,13824,0) (27353,0,13824,0)
(27347,0,13824,0) (27359,0,13824,0) (27347,0,13824,0) (27359,0,13824,0)
(27347,0,13824,0) (10758,0,13824,7) (27353,0,13824,0) (27347,0,13824,0)
(27359,0,13824,0) (27347,0,13824,0) (27321,0,13824,0) (27359,0,13824,0)
(27341,0,13824,0) (27359,0,13824,0) (27347,0,13824,0) (27347,0,13824,0)
(27359,0,13824,0) (27341,0,13824,0) (27357,0,13824,0) (27353,0,13824,0)
(27347,0,13824,0) (27359,0,13824,0) (27347,0,13824,0) (27359,0,13824,0)
(27347,0,13824,0) (27353,0,13824,0) (27359,0,13824,0) (27347,0,13824,0)
(27359,0,13824,0) (27347,0,13824,0) (27347,0,13824,0) (27359,0,13824,0)
(27353,0,13824,0) (27359,0,13824,0) (27347,0,13824,0) (27347,0,13824,0)
(27359,0,13824,0) (27347,0,13824,0) (27359,0,13824,0) (27353,0,13824,0)
(27353,0,13824,0) (27359,0,13824,0) (27347,0,13824,0) (27359,0,13824,0)
(27347,0,13824,0) (27353,0,13824,0) (27359,0,13824,0) (27353,0,13824,0)
(27359,0,13824,0) (27347,0,13824,0) (27347,0,13824,0) (27359,0,13824,0)
(27353,0,13824,0) (27359,0,13824,0) (27353,0,13824,0) (27347,0,13824,0)
(27359,0,13824,0) (27347,0,13824,0) (27359,0,13824,0) (27353,0,13824,0)
(27353,0,13824,0) (27359,0,13824,0) (27347,0,13824,0) (27359,0,13824,0)
(27347,0,13824,0) (1097,0,13824,0)
cylinders in last group 1
blocks in last group 1153
cg 0:
magic 90255 tell 10000 time Fri Jul 12 08:02:20 2013
cgx 0 ncyl 1 niblk 13824 ndblk 219320
nbfree 6 ndir 43 nifree 12636 nffree 563
rotor 204848 irotor 1187 frotor 204848
frsum 13 20 18 20 22 14 26
sum of frsum: 563
clusters 1-3: 4 1 0
clusters size 4 and over: 0
clusters free: 26198, 26219-26220, 26226, 26775, 26798
inodes used: 0-1186, 1188
blks free: 457-458, 1028-1030, 1094-1095, 1590-1591, 4077-4079, 8258-8262,
9241-9247, 13710-13711, 13763-13767, 14241-14247, 14385-14391,
14433-14439,
20761-20767, 20857-20863, 20907-20911, 21051-21055, 21098-21103,
21193-21199,
21262-21263, 28404-28406, 28497-28503, 28545-28551, 28882-28884,
28933-28935,
28982-28983, 29028-29029, 29073-29077, 30021-30023, 30036-30038,
30067-30070,
36569-36573, 36617-36623, 36713-36719, 36761-36767, 42941-42943,
43124-43126,
43169-43175, 43313-43319, 43490-43495, 43537-43543, 54337-54343,
54386-54391,
54481-54486, 54529-54535, 54577-54583, 54817-54821, 56186-56191,
56549-56551,
56957-56958, 57373-57375, 57733-57734, 58045-58046, 58535, 59865-59871,
59913-59919, 59961-59967, 64762-64767, 65330-65335, 65379-65383,
66450-66454,
66810-66814, 67874-67878, 72902-72903, 73622-73623, 73982-73983,
78009-78015,
78057-78063, 78107-78111, 78428-78431, 92620-92623, 94311, 95071,
95823, 96207, 97343, 98103, 99281-99286, 100242-100246,
100986-100991, 101730-101735, 102474-102479, 103220-103223,
103982-103983, 105502-105503,
106849-106855, 107596-107599, 107964-107967, 108708-108711,
109444-109447, 109820-109823,
110188-110191, 110556-110559, 110924-110927, 111660-111663,
112345-112351, 112393-112399,
113570-113575, 114662-114663, 114685-114687, 114699-114703,
114747-114751, 114797-114799,
114810-114815, 114870-114871, 114954-114959, 115291-115295,
115307-115311, 115348-115351,
115357-115359, 116293-116295, 116342, 119981-119983, 120013-120015,
122603-122607,
122628-122631, 122748-122751, 122805-122807, 124235-124239,
189915-189919, 189956-189959,
189999, 190052-190055, 190067-190071, 190611-190615, 190671, 190678,
190687, 193116-193119, 193135, 193254-193255, 193324-193327,
193350-193351,
193390-193391, 209584-209591, 209752-209767, 209808-209815,
214200-214207, 214384-214391
cg 1:
magic 90255 tell 358c8000 time Tue Apr 30 13:01:34 2013
cgx 1 ncyl 1 niblk 13824 ndblk 219320
nbfree 0 ndir 82 nifree 12780 nffree 534
rotor 0 irotor 1043 frotor 4624
frsum 9 4 25 32 35 22 1
sum of frsum: 534
clusters 1-3: 0 0 0
clusters size 4 and over: 0
clusters free:
inodes used: 0-1043
blks free: 459-463, 2804-2807, 3674-3679, 3755-3759, 4436-4439, 4466-4468,
4490-4494, 4523-4526, 4629, 4667-4671, 4682-4684, 4722-4726,
4738-4742, 4779-4783, 4796-4798, 4827-4830, 4842-4846, 4858-4863,
4876-4879, 4908-4911, 4940-4941, 4954-4959, 5002-5006, 5019-5023,
5038-5039, 5082-5087, 5133-5135, 5244-5247, 5259-5263, 5274-5279,
5290-5293, 5309-5311, 5335, 5348-5351, 5364-5367, 5397-5399,
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