From owner-freebsd-stable Fri Apr 12 13:49:33 2002 Delivered-To: freebsd-stable@freebsd.org Received: from server.rucus.ru.ac.za (server.rucus.ru.ac.za [146.231.115.1]) by hub.freebsd.org (Postfix) with SMTP id DB06837B41B for ; Fri, 12 Apr 2002 13:49:00 -0700 (PDT) Received: (qmail 99512 invoked from network); 12 Apr 2002 20:48:56 -0000 Received: from shell-fxp1.rucus.ru.ac.za (HELO shell.rucus.ru.ac.za) (10.0.0.1) by server.rucus.ru.ac.za with SMTP; 12 Apr 2002 20:48:56 -0000 Received: (qmail 20941 invoked by uid 1040); 12 Apr 2002 20:48:56 -0000 Date: Fri, 12 Apr 2002 22:48:56 +0200 From: =?iso-8859-1?Q?David_Sieb=F6rger?= To: freebsd-stable@freebsd.org Subject: Understanding a crash dump Message-ID: <20020412224856.A20583@rucus.ru.ac.za> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="+HP7ph2BbKc20aGI" Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/1.2.5.1i Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG --+HP7ph2BbKc20aGI Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit 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 --+HP7ph2BbKc20aGI Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename=crashdump Content-Transfer-Encoding: quoted-printable 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 to continue, or q 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-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message