Hi,
Just a bit more information: I just tried to run my PDP-11 simulator
while having loaded ng_ether from the previous tests. The simulator uses
the if_tap interface to emulate an ethernet interface to the PDP. Suddenly
the system crashed while doing an ifconfig. The crash occured in
ng_ether_output, because the node pointer in the interface structure was
NULL. It checked the sources of if_tap and ng_ether, but could not find,
how this was caused. So I tried to repeat the crash, but no luck. The
trace from the crashdump shows:
Script started on Tue Jan 30 11:16:48 2001
GNU gdb 4.18
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This GDB was configured as "i386-unknown-freebsd"...
(no debugging symbols found)...
IdlePTD 3457024
initial pcb at 2a8f40
panicstr: from debugger
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x84
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc311a66a
stack pointer = 0x10:0xd7ac5d00
frame pointer = 0x10:0xd7ac5d0c
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 = 12341 (ifconfig)
panic: from debugger
panic: from debugger
Uptime: 17h16m42s
dumping to dev da0s1b, offset 1048736
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
---
#0 0xc0182102 in dumpsys ()
(kgdb) bt
#0 0xc0182102 in dumpsys ()
#1 0xc0181eef in boot ()
#2 0xc01822b9 in panic ()
#3 0xc012e455 in db_panic ()
#4 0xc012e3f5 in db_command ()
#5 0xc012e4ba in db_command_loop ()
#6 0xc0130687 in db_trap ()
#7 0xc020fca6 in kdb_trap ()
#8 0xc021bd08 in trap_fatal ()
#9 0xc021ba7d in trap_pfault ()
#10 0xc021b64b in trap ()
#11 0xc311a66a in ?? ()
#12 0xc01c57d8 in ether_output ()
#13 0xc01ca61b in arprequest ()
#14 0xc01cafff in arp_ifinit ()
#15 0xc01c5c8d in ether_ioctl ()
#16 0xc310eb1c in ?? ()
#17 0xc01cc3dd in in_ifinit ()
#18 0xc01cbf1d in in_control ()
#19 0xc01c4753 in ifioctl ()
#20 0xc0197c72 in soo_ioctl ()
#21 0xc0195082 in ioctl ()
#22 0xc021c14c in syscall2 ()
#23 0xc0210613 in Xint0x80_syscall ()
---Type <return> to continue, or q <return> to quit---
#24 0x80486dd in ?? ()
#25 0x8048135 in ?? ()
(kgdb)
Script done on Tue Jan 30 11:16:53 2001
Frame #11 was ng_ether_output in ddb.
But while trying to repeat the crash I suddenly discovered the following
in /var/log/messages:
Jan 30 11:05:56 beagle /boot/kernel/kernel: Accessing freed node node: ID [3]: type
'ether', 0 hooks, flags 0x9, 0 refs, :
Jan 30 11:05:56 beagle /boot/kernel/kernel: Last active @
/usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c, line 2436
Jan 30 11:05:56 beagle /boot/kernel/kernel: problem discovered at file
/usr/src/sys/modules/netgraph/ether/../../../netgraph/ng_ether.c, line 341
Jan 30 11:05:56 beagle /boot/kernel/kernel: Accessing freed node node: ID [3]: type
'ether', 0 hooks, flags 0x9, 0 refs, :
Jan 30 11:05:56 beagle /boot/kernel/kernel: Last active @
/usr/src/sys/modules/netgraph/ether/../../../netgraph/ng_ether.c, line 341
Jan 30 11:05:56 beagle /boot/kernel/kernel: problem discovered at file
/usr/src/sys/modules/netgraph/ether/../../../netgraph/ng_ether.c, line 344
Jan 30 11:05:56 beagle /boot/kernel/kernel: Accessing freed node node: ID [3]: type
'ether', 0 hooks, flags 0x9, 0 refs, :
Jan 30 11:05:56 beagle /boot/kernel/kernel: Last active @
/usr/src/sys/modules/netgraph/ether/../../../netgraph/ng_ether.c, line 344
Jan 30 11:05:56 beagle /boot/kernel/kernel: problem discovered at file
/usr/src/sys/modules/netgraph/ether/../../../netgraph/ng_ether.c, line 345
That looks exactly like my problem, so I assume it is not the sscop code.
harti
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