Date: Tue, 22 Feb 2000 22:55:43 +0100 From: Jeroen Ruigrok van der Werven <asmodai@bart.nl> To: Thomas David Rivers <rivers@dignus.com> Cc: freebsd-current@FreeBSD.ORG, freebsd-fs@FreeBSD.ORG Subject: Re: Panic (ffs) #2 Message-ID: <20000222225542.A13664@lucifer.bart.nl> In-Reply-To: <200002222054.PAA87131@lakes.dignus.com>; from rivers@dignus.com on Tue, Feb 22, 2000 at 03:54:21PM -0500 References: <20000222214156.A13189@lucifer.bart.nl> <200002222054.PAA87131@lakes.dignus.com>
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-On [20000222 21:55], Thomas David Rivers (rivers@dignus.com) wrote:
>>
>> And here we are again.
>>
>> This time on another disk:
>>
>> dev = #amrd/0x20004, block = 2048, fs = /news/spool
>> panic: ffs_blkfree: freeing free block
>> Debugger("panic")
>> Stopped at Debugger+0x35: movb $0,in_Debugger.372
>> db> trace
>> Debugger(c01e7ee3) at Debugger+0x35
>> panic(c01f27e0,c01f27c0,c1ccc894,800,c1d0d0d4) at panic+0x70
>> ffs_blkfree(c1db6d00,800,2000,0,d98cfe44) at ffs_blkfree+0x1dd
>
> Aha! The Dave Rivers' memorial panic rears its ugly head!
>
> This is exactly the panic's I reported years ago; but we've never
> been able to track down... [Even the same block number I believe]
Well, at this rate I can drop debugs on the lists at a rate of one per
day.
> You may want to scan the archives to read more about my investigations;
If they were up. Thank god I have some personal archives... Hope I'll
get some info from them.
> which never went anywhere... (sigh) I describe a way to reproduce
> it on some versions of FreeBSD, you might want to see if you can
> get a reliable reproduction, etc...
Hah, reliable reproduction, try to let the box stay up for a day or two,
bang.
So far in this existance of the box, I have had 4 ffs panics and 1
tcp... If this were a debug box I'd say ok, well cool... But this is
in fact a machine so close to the RC of 4.0 that I am not sure I want to
run production servers on it.
Add to that mix that I am a b-rated coder, just learning about gdb, and
on filesystem level and even dumber than (insert locally dumb idiot
here).
Then the logical step might be to say, well, then the hardware must be
faulty... No way Jose... I have tested this box in every way possible,
even detected incorrect CAS/RAS latency settings on the box in the BIOS
for the memory.
Anyways:
[root@tyr] (4) # gdb -k /kernel.debug vmcore.1
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 2625536
initial pcb at 21c9e0
panicstr: from debugger
panic messages:
---
panic: ffs_blkfree: freeing free block
panic: from debugger
Uptime: 39m4s
amrd0: still open, can't shutdown
dumping to dev #da/0x20001, offset 524312
dump 511 510 509 508 507 506 505 504 503 502 501 500 499 498 497 496 495 494 493 492 491 490 489 488 487 486 485 484 483 482 481 480 479 478 477 476 475 474 473 472 471 470 469 468 467 466 465 464 463 462 461 460 459 458 457 456 455 454 453 452 451 450 449 448 447 446 445 444 443 442 441 440 439 438 437 436 435 434 433 432 431 430 429 428 427 426 425 424 423 422 421 420 419 418 417 416 415 414 413 412 411 410 409 408 407 406 405 404 403 402 401 400 399 398 397 396 395 394 393 392 391 390 389 388 387 386 385 384 383 382 381 380 379 378 377 376 375 374 373 372 371 370 369 368 367 366 365 364 363 362 361 360 359 358 357 356 355 354 353 352 351 350 349 348 347 346 345 344 343 342 341 340 339 338 337 336 335 334 333 332 331 330 329 328 327 326 325 324 323 322 321 320 319 318 317 316 315 314 313 312 311 310 309 308 307 306 305 304 303 302 301 300 299 298 297 296 295 294 293 292 291 290 289 288 287 286 285 284 283 282 281 280 279 278 277 276 275 274 273 272 271 270 269 268 267 266 !
265 264 263 262 261 260 259 258 257 256 255 254 253 252 251 250 249 248 247 246 245 244 243 242 241 240 239 238 237 236 235 234 233 232 231 230 229 228 227 226 225 224 223 222 221 220 219 218 217 216 215 214 213 212 211 210 209 208 207 206 205 204 203 202 201 200 199 198 197 196 195 194 193 192 191 190 189 188 187 186 185 184 183 182 181 180 179 178 177 176 175 174 173 172 171 170 169 168 167 166 165 164 163 162 161 160 159 158 157 156 155 154 153 152 151 150 149 148 147 146 145 144 143 142 141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 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
---
(kgdb) bt
#0 boot (howto=260) at ../../kern/kern_shutdown.c:304
#1 0xc0143d61 in panic (fmt=0xc01e27f4 "from debugger")
at ../../kern/kern_shutdown.c:554
#2 0xc01244e1 in db_panic (addr=-1071886047, have_addr=0, count=-1,
modif=0xd8b7fb88 "") at ../../ddb/db_command.c:433
#3 0xc0124481 in db_command (last_cmdp=0xc02042fc, cmd_table=0xc020415c,
aux_cmd_tablep=0xc021905c) at ../../ddb/db_command.c:333
#4 0xc0124546 in db_command_loop () at ../../ddb/db_command.c:455
#5 0xc012665f in db_trap (type=3, code=0) at ../../ddb/db_trap.c:71
#6 0xc01c4ec5 in kdb_trap (type=3, code=0, regs=0xd8b7fc90)
at ../../i386/i386/db_interface.c:158
#7 0xc01d05f4 in trap (frame={tf_fs = -1072431088, tf_es = -701956080,
tf_ds = -701956080, tf_edi = -838037504, tf_esi = 256,
tf_ebp = -659030824, tf_isp = -659030852, tf_ebx = -1071700000,
tf_edx = 0, tf_ecx = 1021, tf_eax = 18, tf_trapno = 3, tf_err = 0,
tf_eip = -1071886047, tf_cs = 8, tf_eflags = 582, tf_esp = -1071668385,
tf_ss = -1071743261}) at ../../i386/i386/trap.c:549
#8 0xc01c5121 in Debugger (msg=0xc01e7ee3 "panic") at machine/cpufunc.h:64
#9 0xc0143d58 in panic (fmt=0xc01f27e0 "ffs_blkfree: freeing free block")
at ../../kern/kern_shutdown.c:552
#10 0xc0195c61 in ffs_blkfree (ip=0xc1d92200, bno=6560, size=8192)
at ../../ufs/ffs/ffs_alloc.c:1337
#11 0xc0197be1 in ffs_truncate (vp=0xd8d11fe0, length=0, flags=0, cred=0x0,
p=0xd8b320c0) at ../../ufs/ffs/ffs_inode.c:337
#12 0xc019c8e6 in ufs_inactive (ap=0xd8b7feb8) at ../../ufs/ufs/ufs_inode.c:84
#13 0xc01a1985 in ufs_vnoperate (ap=0xd8b7feb8)
at ../../ufs/ufs/ufs_vnops.c:2283
#14 0xc016d0ae in vput (vp=0xd8d11fe0) at vnode_if.h:794
#15 0xc01703b9 in unlink (p=0xd8b320c0, uap=0xd8b7ff80)
at ../../kern/vfs_syscalls.c:1421
#16 0xc01d0e96 in syscall (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = 1, tf_esi = 134721536, tf_ebp = -1077945076,
tf_isp = -659030060, tf_ebx = 134750720, tf_edx = 134750812, tf_ecx = 0,
tf_eax = 10, tf_trapno = 7, tf_err = 2, tf_eip = 134533504, tf_cs = 31,
tf_eflags = 647, tf_esp = -1077945120, tf_ss = 47})
at ../../i386/i386/trap.c:1073
#17 0xc01c57c6 in Xint0x80_syscall ()
#18 0x80482c3 in ?? ()
#19 0x80480f9 in ?? ()
(kgdb) up 10
#10 0xc0195c61 in ffs_blkfree (ip=0xc1d92200, bno=6560, size=8192)
at ../../ufs/ffs/ffs_alloc.c:1337
1337 panic("ffs_blkfree: freeing free block");
More info will be coming shortly...
As usual, advice, hints, tips (on how to maintain my sanity for example)
are highly appreciated.
--
Jeroen Ruigrok van der Werven Network- and systemadministrator
<asmodai@bart.nl> bART Internet Services /
BSD: Technical excellence at its best VIA NET.WORKS Netherlands
el: +31 - (0) 10 - 240 39 70 http://www.bart.nl
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