Date: Fri, 12 Apr 2002 22:48:56 +0200 From: =?iso-8859-1?Q?David_Sieb=F6rger?= <drs@rucus.ru.ac.za> To: freebsd-stable@freebsd.org Subject: Understanding a crash dump Message-ID: <20020412224856.A20583@rucus.ru.ac.za>
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One of our FreeBSD machines paniced this afternoon. It saved a crash
dump, but I haven't been able to learn very much from the dump.
I've attached a backtrace from gdb. Apparently the second panic
occured while trying to sync the disks after the first panic, but the
trail goes cold at #16 and I can't see what caused the original
panic.
Can anyone shed any light on this? Is there anything useful still to
be gleaned from this dump, or is there anything that I should do to
get better information in future?
--
David Siebörger
drs@rucus.ru.ac.za
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Script started on Fri Apr 12 21:40:49 2002
shell:/usr/obj/usr/build/src/sys/RUCUS# uname -a
FreeBSD shell.rucus.ru.ac.za 4.5-STABLE FreeBSD 4.5-STABLE #0: Mon Mar 4 1=
6:55:49 SAST 2002 drs@shell.rucus.ru.ac.za:/usr/build/obj/usr/build/src=
/sys/RUCUS i386=0D
shell:/usr/obj/usr/build/src/sys/RUCUS# gdb -k=0D
GNU gdb 4.18=0D
Copyright 1998 Free Software Foundation, Inc.=0D
GDB is free software, covered by the GNU General Public License, and you ar=
e=0D
welcome to change it and/or distribute copies of it under certain condition=
s.=0D
Type "show copying" to see the conditions.=0D
There is absolutely no warranty for GDB. Type "show warranty" for details.=
=0D
This GDB was configured as "i386-unknown-freebsd".=0D
(kgdb) symbol-file kernel.debug=0D
Reading symbols from kernel.debug...done.=0D
(kgdb) exec-file /var/crash/kernel.2=0D
(kgdb) core-file /var/crash/vmcore.2 =0D
IdlePTD at phsyical address 0x00365000=0D
initial pcb at physical address 0x002d0260=0D
panicstr: page fault=0D
panic messages:=0D
---=0D
Fatal trap 12: page fault while in kernel mode=0D
fault virtual address =3D 0x0=0D
fault code =3D supervisor read, page not present=0D
instruction pointer =3D 0x8:0x0=0D
stack pointer =3D 0x10:0xc0292f38=0D
frame pointer =3D 0x10:0xc0292f44=0D
code segment =3D base 0x0, limit 0xfffff, type 0x1b=0D
=3D DPL 0, pres 1, def32 1, gran 1=0D
processor eflags =3D interrupt enabled, resume, IOPL =3D 0=0D
current process =3D Idle=0D
interrupt mask =3D =0D
trap number =3D 12=0D
panic: page fault=0D
=0D
syncing disks... =0D
=0D
Fatal trap 12: page fault while in kernel mode=0D
fault virtual address =3D 0x30=0D
fault code =3D supervisor read, page not present=0D
instruction pointer =3D 0x8:0xc01cb1a4=0D
stack pointer =3D 0x10:0xc0292d64=0D
frame pointer =3D 0x10:0xc0292d6c=0D
code segment =3D base 0x0, limit 0xfffff, type 0x1b=0D
=3D DPL 0, pres 1, def32 1, gran 1=0D
processor eflags =3D interrupt enabled, resume, IOPL =3D 0=0D
current process =3D Idle=0D
interrupt mask =3D bio =0D
trap number =3D 12=0D
panic: page fault=0D
Uptime: 12d21h46m41s=0D
=0D
dumping to dev #da/0x20009, offset 1634=0D
dump 767 766 765 764 763 762 761 760 759 758 757 756 755 754 753 752 751 75=
0 749 748 747 746 745 744 743 742 741 740 739 738 737 736 735 734 733 732 7=
31 730 729 728 727 726 725 724 723 722 721 720 719 718 717 716 715 714 713 =
712 711 710 709 708 707 706 705 704 703 702 701 700 699 698 697 696 695 694=
693 692 691 690 689 688 687 686 685 684 683 682 681 680 679 678 677 676 67=
5 674 673 672 671 670 669 668 667 666 665 664 663 662 661 660 659 658 657 6=
56 655 654 653 652 651 650 649 648 647 646 645 644 643 642 641 640 639 638 =
637 636 635 634 633 632 631 630 629 628 627 626 625 624 623 622 621 620 619=
618 617 616 615 614 613 612 611 610 609 608 607 606 605 604 603 602 601 60=
0 599 598 597 596 595 594 593 592 591 590 589 588 587 586 585 584 583 582 5=
81 580 579 578 577 576 575 574 573 572 571 570 569 568 567 566 565 564 563 =
562 561 560 559 558 557 556 555 554 553 552 551 550 549 548 547 546 545 544=
543 542 541 540 539 538 537 536 535 534 533 532 531 530 529 528 527 526 52=
5 524 523 522 521 520 519 518 517 516 515 514 513 512 511 510 509 508 507 5=
06 505 504 503 502 501 500 499 498 497 496 495 494 493 492 491 490 489 488 =
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 45=
0 449 448 447 446 445 444 443 442 441 440 439 438 437 436 435 434 433 432 4=
31 430 429 428 427 426 425 424 423 422 421 420 419 418 417 416 415 414 413 =
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 37=
5 374 373 372 371 370 369 368 367 366 365 364 363 362 361 360 359 358 357 3=
56 355 354 353 352 351 350 349 348 347 346 345 344 343 342 341 340 339 338 =
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 30=
0 299 298 297 296 295 294 293 292 291 290 289 288 287 286 285 284 283 282 2=
81 280 279 278 277 276 275 274 273 272 271 270 269 268 267 266 265 264 263 =
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 22=
5 224 223 222 221 220 219 218 217 216 215 214 213 212 211 210 209 208 207 2=
06 205 204 203 202 201 200 199 198 197 196 195 194 193 192 191 190 189 188 =
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 15=
0 149 148 147 146 145 144 143 142 141 140 139 138 137 136 135 134 133 132 1=
31 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 =
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 =0D
---=0D
#0 dumpsys () at /usr/build/src/sys/kern/kern_shutdown.c:487=0D
487 if (dumping++) {=0D
(kgdb) where=0D
#0 dumpsys () at /usr/build/src/sys/kern/kern_shutdown.c:487=0D
#1 0xc0169ca3 in boot (howto=3D260) at /usr/build/src/sys/kern/kern_shutdo=
wn.c:316=0D
#2 0xc016a0e5 in panic (fmt=3D0xc028bd6c "%s")=0D
at /usr/build/src/sys/kern/kern_shutdown.c:595=0D
#3 0xc0245eff in trap_fatal (frame=3D0xc0292d24, eva=3D48)=0D
at /usr/build/src/sys/i386/i386/trap.c:966=0D
#4 0xc0245bad in trap_pfault (frame=3D0xc0292d24, usermode=3D0, eva=3D48)=
=0D
at /usr/build/src/sys/i386/i386/trap.c:859=0D
#5 0xc0245753 in trap (frame=3D{tf_fs =3D 16, tf_es =3D 16, tf_ds =3D 16, =
=0D
tf_edi =3D -1070708352, tf_esi =3D 0, tf_ebp =3D -1071043220, tf_isp =
=3D -1071043248, =0D
tf_ebx =3D -1070961092, tf_edx =3D 6832192, tf_ecx =3D 31, tf_eax =3D=
0, tf_trapno =3D 12, =0D
tf_err =3D 0, tf_eip =3D -1071861340, tf_cs =3D 8, tf_eflags =3D 6605=
0, tf_esp =3D 0, =0D
tf_ss =3D 0}) at /usr/build/src/sys/i386/i386/trap.c:458=0D
#6 0xc01cb1a4 in acquire_lock (lk=3D0xc02a6e3c)=0D
at /usr/build/src/sys/ufs/ffs/ffs_softdep.c:266=0D
#7 0xc01cf7e2 in softdep_fsync_mountdev (vp=3D0xd91c4b40)=0D
at /usr/build/src/sys/ufs/ffs/ffs_softdep.c:4024=0D
#8 0xc01d3b7e in ffs_fsync (ap=3D0xc0292de0)=0D
at /usr/build/src/sys/ufs/ffs/ffs_vnops.c:134=0D
#9 0xc01d280b in ffs_sync (mp=3D0xc1f90200, waitfor=3D2, cred=3D0xc16da900=
, p=3D0xc02e4980)=0D
at vnode_if.h:558=0D
#10 0xc0199407 in sync (p=3D0xc02e4980, uap=3D0x0)=0D
at /usr/build/src/sys/kern/vfs_syscalls.c:554=0D
#11 0xc0169a66 in boot (howto=3D256) at /usr/build/src/sys/kern/kern_shutdo=
wn.c:235=0D
#12 0xc016a0e5 in panic (fmt=3D0xc028bd6c "%s")=0D
at /usr/build/src/sys/kern/kern_shutdown.c:595=0D
#13 0xc0245eff in trap_fatal (frame=3D0xc0292ef8, eva=3D0)=0D
at /usr/build/src/sys/i386/i386/trap.c:966=0D
#14 0xc0245bad in trap_pfault (frame=3D0xc0292ef8, usermode=3D0, eva=3D0)=0D
---Type <return> to continue, or q <return> to quit---=0D
at /usr/build/src/sys/i386/i386/trap.c:859=0D
#15 0xc0245753 in trap (frame=3D{tf_fs =3D 16, tf_es =3D 16, tf_ds =3D 16, =
tf_edi =3D 0, =0D
tf_esi =3D -1040807936, tf_ebp =3D -1071042748, tf_isp =3D -107104278=
0, =0D
tf_ebx =3D -1036232128, tf_edx =3D -6, tf_ecx =3D 10, tf_eax =3D -6, =
tf_trapno =3D 12, =0D
tf_err =3D 0, tf_eip =3D 0, tf_cs =3D 8, tf_eflags =3D 66055, tf_esp =
=3D -1040807936, =0D
tf_ss =3D 40}) at /usr/build/src/sys/i386/i386/trap.c:458=0D
#16 0x0 in ?? ()=0D
(kgdb) up 6=0D
#6 0xc01cb1a4 in acquire_lock (lk=3D0xc02a6e3c)=0D
at /usr/build/src/sys/ufs/ffs/ffs_softdep.c:266=0D
266 lk->lkt_held =3D CURPROC->p_pid;=0D
(kgdb) list=0D
261 panic("softdep_lock: locking against myself");=0D
262 else=0D
263 panic("softdep_lock: lock held by %d", holder);=0D
264 }=0D
265 lk->lkt_spl =3D splbio();=0D
266 lk->lkt_held =3D CURPROC->p_pid;=0D
267 lockcnt++;=0D
268 }=0D
269 =0D
270 static void=0D
(kgdb) exit=0D
shell:/usr/obj/usr/build/src/sys/RUCUS# exit=0D
Script done on Fri Apr 12 22:30:39 2002
--+HP7ph2BbKc20aGI--
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