I was trying to play a VCD (using mplayer) on my 6-STABLE system and it runs for a while and then crashes. This is reproducable with the same traceback.
kgdb reports: acd0: FAILURE - device detached Fatal trap 12: page fault while in kernel mode fault virtual address = 0x3c8 fault code = supervisor read data, page not present instruction pointer = 0x8:0xffffffff801b6489 stack pointer = 0x10:0xffffffffa3561ba0 frame pointer = 0x10:0xffffffffa3561bc0 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, long 1, def32 0, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 2 (g_event) trap number = 12 panic: page fault KDB: stack backtrace: panic() at panic+0x1c1 trap_fatal() at trap_fatal+0x298 trap_pfault() at trap_pfault+0x243 trap() at trap+0x298 calltrap() at calltrap+0x5 --- trap 0xc, rip = 0xffffffff801b6489, rsp = 0xffffffffa3561ba0, rbp = 0xffffffffa3561bc0 --- acd_geom_detach() at acd_geom_detach+0x19 g_run_events() at g_run_events+0x1b7 g_event_procbody() at g_event_procbody+0x5a fork_exit() at fork_exit+0x87 fork_trampoline() at fork_trampoline+0xe A gdb backtrace shows: #6 0xffffffff803787bb in calltrap () at /usr/src/sys/amd64/amd64/exception.S:168 #7 0xffffffff801b6489 in acd_geom_detach (arg=0xffffff00007e1100, flag=0x0) at /usr/src/sys/dev/ata/atapi-cd.c:194 #8 0xffffffff8022f267 in g_run_events () at /usr/src/sys/geom/geom_event.c:209 #9 0xffffffff802305ca in g_event_procbody () at /usr/src/sys/geom/geom_kern.c:141 #10 0xffffffff80254f77 in fork_exit (callout=0xffffffff80230570 <g_event_procbody>, arg=0x0, frame=0xffffff0039dc4770) at /usr/src/sys/kern/kern_fork.c:821 #11 0xffffffff80378b1e in fork_trampoline () at /usr/src/sys/amd64/amd64/exception.S:394 The argument to acd_geom_detach() does include a NULL ivars: (kgdb) p *(device_t)0xffffff00007e1100 $2 = { ops = 0xffffff0000825000, link = { tqe_next = 0xffffff00007c1c00, tqe_prev = 0xffffff00008ea130 }, devlink = { tqe_next = 0xffffff00007c1c00, tqe_prev = 0xffffff00009f1518 }, parent = 0xffffff00008ea100, children = { tqh_first = 0x0, tqh_last = 0xffffff00007e1130 }, driver = 0xffffffff80532220, devclass = 0xffffff00007ebe00, unit = 0x0, nameunit = 0xffffff00009d19d0 "acd0", desc = 0xffffff0039bd72a0 "TSSTcorpCD/DVDW TS-L532M/HR08", busy = 0x0, state = DS_ATTACHED, devflags = 0x0, flags = 0x5d, order = 0x0, pad = 0x0, ivars = 0x0, softc = 0xffffff0000acac00, sysctl_ctx = { tqh_first = 0xffffff0039bd7120, tqh_last = 0xffffff0039bd7228 }, sysctl_tree = 0xffffff0000b30600 } (kgdb) Is this behaviour expected? -- Peter Jeremy
pgpIYSxHJT549.pgp
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