Date: Mon, 18 Mar 2002 01:02:45 -0800 From: Kris Kennaway <kris@obsecurity.org> To: Alfred Perlstein <alfred@freebsd.org> Cc: Dag-Erling Smorgrav <des@ofug.org>, Kris Kennaway <kris@obsecurity.org>, current@freebsd.org, fs@freebsd.org Subject: Re: panic: bwrite: buffer is not busy??? Message-ID: <20020318010245.A48956@xor.obsecurity.org> In-Reply-To: <20020318071623.GD894@elvis.mu.org>; from alfred@freebsd.org on Sun, Mar 17, 2002 at 11:16:23PM -0800 References: <20020317124958.A34008@xor.obsecurity.org> <xzpadt6r1xr.fsf@flood.ping.uio.no> <20020318061739.GB894@elvis.mu.org> <xzpvgbupdqa.fsf@flood.ping.uio.no> <20020318071623.GD894@elvis.mu.org>
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On Sun, Mar 17, 2002 at 11:16:23PM -0800, Alfred Perlstein wrote:
> * Dag-Erling Smorgrav <des@ofug.org> [020317 22:55] wrote:
> > Alfred Perlstein <alfred@freebsd.org> writes:
> > > Please let me know if this works for you.
> > > [...]
> > > + PROC_LOCK(td);
> >=20
> > *cough* *cough*
> >=20
> > :)
>=20
> It was untested. :) I'm sure you can fix it, I've got to get some
> sleep, let me know if it works for you.
With the corrected version of that patch (and a patch from Tor to fix
VM deadlocks in green's commit) I got this panic. DES has been taking
a look at it, but I'm sending it here in case anyone else has insight
too.
Kris
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address =3D 0x48
fault code =3D supervisor write, page not present
instruction pointer =3D 0x8:0xc01f833c
stack pointer =3D 0x10:0xda1a8b4c
frame pointer =3D 0x10:0xda1a8b74
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 92729 (tail)
trap number =3D 12
panic: page fault
syncing disks... panic: bwrite: buffer is not busy???
Uptime: 27m34s
dumping to dev ad0b, offset 1051136
dump ata0: resetting devices .. done
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 47=
3 472 471 470 469 468 467 466 465 464 463 462 461 460 459 458 457 456 455 4=
54 453 452 451 450 449 448 447 446 445 444 443 442 441 440 439 438 437 436 =
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 39=
8 397 396 395 394 393 392 391 390 389 388 387 386 385 384 383 382 381 380 3=
79 378 377 376 375 374 373 372 371 370 369 368 367 366 365 364 363 362 361 =
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 32=
3 322 321 320 319 318 317 316 315 314 313 312 311 310 309 308 307 306 305 3=
04 303 302 301 300 299 298 297 296 295 294 293 292 291 290 289 288 287 286 =
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 24=
8 247 246 245 244 243 242 241 240 239 238 237 236 235 234 233 232 231 230 2=
29 228 227 226 225 224 223 222 221 220 219 218 217 216 215 214 213 212 211 =
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 17=
3 172 171 170 169 168 167 166 165 164 163 162 161 160 159 158 157 156 155 1=
54 153 152 151 150 149 148 147 146 145 144 143 142 141 140 139 138 137 136 =
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
---
#0 dumpsys () at ../../../kern/kern_shutdown.c:505
505 ../../../kern/kern_shutdown.c: No such file or directory.
b(kgdb) bt
#0 dumpsys () at ../../../kern/kern_shutdown.c:505
#1 0xc020d4b4 in boot (howto=3D260) at ../../../kern/kern_shutdown.c:337
#2 0xc020d953 in panic (fmt=3D0xc0376d4b "bwrite: buffer is not busy???")
at ../../../kern/kern_shutdown.c:647
#3 0xc0242c3b in bwrite (bp=3D0xce63eb88) at ../../../kern/vfs_bio.c:747
#4 0xc024404a in vfs_bio_awrite (bp=3D0xce63eb88) at ../../../kern/vfs_bio=
.c:1606
#5 0xc01e49e8 in spec_fsync (ap=3D0xda1a8a08) at ../../../fs/specfs/spec_v=
nops.c:403
#6 0xc01e45a5 in spec_vnoperate (ap=3D0xda1a8a08) at ../../../fs/specfs/sp=
ec_vnops.c:121
#7 0xc02e818c in ffs_sync (mp=3D0xc4061400, waitfor=3D2, cred=3D0xc145a980=
, td=3D0xc03b3000)
at vnode_if.h:441
#8 0xc02505e9 in sync (td=3D0xc03b3000, uap=3D0x0) at ../../../kern/vfs_sy=
scalls.c:673
#9 0xc020d100 in boot (howto=3D256) at ../../../kern/kern_shutdown.c:246
#10 0xc020d953 in panic (fmt=3D0xc039501e "%s") at ../../../kern/kern_shutd=
own.c:647
#11 0xc03335d0 in trap_fatal (frame=3D0xda1a8b0c, eva=3D72) at ../../../i38=
6/i386/trap.c:851
#12 0xc03332f9 in trap_pfault (frame=3D0xda1a8b0c, usermode=3D0, eva=3D72) =
at ../../../i386/i386/trap.c:765
#13 0xc0332d83 in trap (frame=3D{tf_fs =3D -1001521128, tf_es =3D -10696785=
76, tf_ds =3D -635830256,
tf_edi =3D -1001489664, tf_esi =3D 0, tf_ebp =3D -635794572, tf_isp =
=3D -635794632,
tf_ebx =3D -1002099200, tf_edx =3D 4, tf_ecx =3D -636822144, tf_eax =
=3D 4, tf_trapno =3D 12, tf_err =3D 2,
tf_eip =3D -1071676612, tf_cs =3D 8, tf_eflags =3D 66194, tf_esp =3D =
-1002099200, tf_ss =3D 4})
at ../../../i386/i386/trap.c:433
#14 0xc01f833c in kqueue_close (fp=3D0xc4452e00, td=3D0xda0add80) at machin=
e/atomic.h:139
#15 0xc01f67b6 in fdrop_locked (fp=3D0xc4452e00, td=3D0xda0add80) at ../../=
../sys/file.h:230
#16 0xc01f5c9e in fdrop (fp=3D0xc4452e00, td=3D0xda0add80) at ../../../kern=
/kern_descrip.c:1545
#17 0xc01f5c4c in closef (fp=3D0xc4452e00, td=3D0xda0add80) at ../../../ker=
n/kern_descrip.c:1531
#18 0xc01f5729 in fdfree (td=3D0xda0add80) at ../../../kern/kern_descrip.c:=
1352
#19 0xc01fa4fd in exit1 (td=3D0xda0add80, rv=3D15) at ../../../kern/kern_ex=
it.c:199
#20 0xc0211157 in sigexit (td=3D0xda0add80, sig=3D15) at ../../../kern/kern=
_sig.c:1856
#21 0xc0210dc8 in postsig (sig=3D15) at ../../../kern/kern_sig.c:1748
#22 0xc0226fe6 in userret (td=3D0xda0add80, frame=3D0xda1a8d48, oticks=3D1)=
at ../../../kern/subr_trap.c:78
#23 0xc0333934 in syscall (frame=3D{tf_fs =3D 47, tf_es =3D 47, tf_ds =3D 4=
7, tf_edi =3D 1, tf_esi =3D 0,
tf_ebp =3D -1077938360, tf_isp =3D -635794060, tf_ebx =3D 1, tf_edx =
=3D 4, tf_ecx =3D 672242496,
tf_eax =3D 4, tf_trapno =3D 12, tf_err =3D 2, tf_eip =3D 671769507, t=
f_cs =3D 31, tf_eflags =3D 583,
tf_esp =3D -1077938580, tf_ss =3D 47}) at ../../../i386/i386/trap.c:1=
093
#24 0xc0324e4d in syscall_with_err_pushed ()
#25 0x804a283 in ?? ()
#26 0x8048bdd in ?? ()
(kgdb)
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