Date: Tue, 14 Sep 2004 16:02:45 +0900 From: daichi <daichi@freebsd.org> To: Max Khon <fjoe@FreeBSD.org> Cc: freebsd-geom@FreeBSD.org Subject: Re: kern/71431: [panic fix] [patch] geom_uzip.ko caused panic Message-ID: <20040914160245.7db7d1e0.daichi@freebsd.org> In-Reply-To: <200409090607.i89674F3039635@freefall.freebsd.org> References: <200409090607.i89674F3039635@freefall.freebsd.org>
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> I can't reproduce this. > geom uzip load does not work. > kldload geom_uzip works perfectly. > > Can you provide stack trace? > Can you reproduce the problem on recent -CURRENT? > You can try this patch instead (but I doubt that it will change anything > for you): I tried 5.3-BETA 9/9 and that did not get panic. And I tried 6-current 9/9 and that did get panic. The stack trace is follow: --------------------- panic: malloc(9)/free(9) confusion. Probably freeing with wrong type, but maybe not here. cpuid = 0 KDB: enter: panic [thread 100026] Stopped at kdb_enter+0x2b: nop db> trace kdb_enter(c07f0204) at kdb_enter+0x2b panic(c07ee89b,c07ee865,c1f180c0,c1efcc80,c1d4dd40) at panic+0x127 free(c1e55000,c1f18040,d4225c8c,c05f7a0c,c0847004) at free+0x29 g_uzip_taste(c1f180c0,c1b42680,0,c0846ea0,c1efca80) at g_uzip_taste+0x5cf g_load_class(c1ad6830,0,66666667,d4225d04,c05d0139) at g_load_class+0x127 one_event(d4225d1c,c05d1605,3c,28,c19c68c0) at one_event+0x14f g_run_events(3c,28,c19c68c0,c05d15c8,d4225d34) at g_run_events+0x9 g_event_procbody(0,d4225d48,0,c05d15c8,0) at g_event_procbody+0x3d fork_exit(c05d15c8,0,d4225d48) at fork_exit+0xa4 fork_trampoline() at fork_trampoline+0x8 --- trap 0x1, eip=0, esp = 0xd4225d7c, ebp = 0 --- db> --------------------- I think this problem depends on malloc/free confusion. In shortly, next code is bad I think. void * buf = malloc(size, M_GEOM, M_WAITOK); free(buf, M_GEOM_UZIP); In for_loop of g_uzip_taste, malloced area gets free with M_GEOM_UZIP flag. But the area is malloced with M_GEOM flag. I think this causes problem. -- Daichi GOTO, http://people.freebsd.org/~daichi
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