Date: Mon, 7 Jan 2008 10:42:57 GMT From: Jille Timmermans <Jille@quis.cx> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/119415: Kernel panic (page fault) with devfs rules Message-ID: <200801071042.m07AgvLx012517@www.freebsd.org> Resent-Message-ID: <200801071050.m07Ao11h047752@freefall.freebsd.org>
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>Number: 119415 >Category: kern >Synopsis: Kernel panic (page fault) with devfs rules >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Jan 07 10:50:01 UTC 2008 >Closed-Date: >Last-Modified: >Originator: Jille Timmermans >Release: FreeBSD 6.3-PRERELEASE i386 >Organization: None >Environment: FreeBSD blackbox.quis.cx 6.3-PRERELEASE FreeBSD 6.3-PRERELEASE #1: Sun Jan 6 23:24:15 CET 2008 root@blackbox.quis.cx:/usr/obj/usr/src/sys/BLACKBOX i386 FreeBSD istud.quis.cx 6.2-RELEASE-p4 FreeBSD 6.2-RELEASE-p4 #0: Sat May 12 16:41:58 CEST 2007 root@istud.quis.cx:/usr/obj/usr/src/sys/ISTUD i386 >Description: A kernel panic (page fault) occurs when trying to add/apply rules to a devfs mount. A value of a null-pointed struct is used in devfs_rule_match(). (/usr/src/sys/fs/devfs/devfs_rule.c:546) Crash: Fatal trap 12: page fault while in kernel mode fault virtual address = 0x4 fault code = supervisor read, page not present instruction pointer = 0x20:0xc0528441 stack pointer = 0x28:0xe57f2b04 frame pointer = 0x28:0xe57f2b10 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 = 721 (devfs) trap number = 12 panic: page fault Uptime: 17s Backtrace: #0 doadump () at pcpu.h:165 165 pcpu.h: No such file or directory. in pcpu.h (kgdb) bt #0 doadump () at pcpu.h:165 #1 0xc0571e10 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409 #2 0xc05720bb in panic (fmt=0xc0713e0a "%s") at /usr/src/sys/kern/kern_shutdown.c:565 #3 0xc06d9dca in trap_fatal (frame=0xe57f2ac4, eva=4) at /usr/src/sys/i386/i386/trap.c:838 #4 0xc06d9afb in trap_pfault (frame=0xe57f2ac4, usermode=0, eva=4) at /usr/src/sys/i386/i386/trap.c:745 #5 0xc06d9765 in trap (frame= {tf_fs = 8, tf_es = -1066270680, tf_ds = -1056636888, tf_edi = -983976192, tf_esi = -982153344, tf_ebp = -444650736, tf_isp = -44465076 8, tf_ebx = -983976180, tf_edx = -988857600, tf_ecx = -985599760, tf_eax = 0, tf_trapno = 12, tf_err = 0, tf_eip = -1068334015, tf_cs = 32, t f_eflags = 66182, tf_esp = -983976180, tf_ss = -982153344}) at /usr/src/sys/i386/i386/trap.c:435 #6 0xc06c760a in calltrap () at /usr/src/sys/i386/i386/exception.s:139 #7 0xc0528441 in devfs_rule_match (dk=0xc559b700, de=0xc5758780) at /usr/src/sys/fs/devfs/devfs_rule.c:546 #8 0xc05284fe in devfs_rule_run (dk=0xc559b700, de=0xc5758780, depth=1) at /usr/src/sys/fs/devfs/devfs_rule.c:588 #9 0xc052812e in devfs_rule_applyde_recursive (dk=0xc559b700, de=0xc5758780) at /usr/src/sys/fs/devfs/devfs_rule.c:343 #10 0xc0528117 in devfs_rule_applyde_recursive (dk=0xc559b700, de=0xc5759000) at /usr/src/sys/fs/devfs/devfs_rule.c:342 #11 0xc0528149 in devfs_rule_applydm (dk=0xc559b700, dm=0x0) at /usr/src/sys/fs/devfs/devfs_rule.c:353 #12 0xc05285fb in devfs_ruleset_applydm (ds=0x0, dm=0xc5759080) at /usr/src/sys/fs/devfs/devfs_rule.c:657 #13 0xc0528076 in devfs_rules_ioctl (dm=0xc5759080, cmd=2147632139, data=0xc540f0f0 "", td=0xc5395000) at /usr/src/sys/fs/devfs/devfs_rule.c:287 #14 0xc052a833 in devfs_rioctl (ap=0xe57f2bf4) at /usr/src/sys/fs/devfs/devfs_vnops.c:1115 #15 0xc06eb1ee in VOP_IOCTL_APV (vop=0x0, a=0xe57f2bf4) at vnode_if.c:804 #16 0xc05d1aa1 in vn_ioctl (fp=0xc53cc240, com=2147632139, data=0xc540f0f0, active_cred=0xc5758e00, td=0xc5395000) at vnode_if.h:436 #17 0xc0594fe6 in ioctl (td=0xc5395000, uap=0xe57f2d04) at file.h:265 #18 0xc06da057 in syscall (frame= {tf_fs = 59, tf_es = 59, tf_ds = 59, tf_edi = 1, tf_esi = -1077940980, tf_ebp = -1077941224, tf_isp = -444650140, tf_ebx = 134525616, t f_edx = 0, tf_ecx = 0, tf_eax = 54, tf_trapno = 12, tf_err = 2, tf_eip = 672381475, tf_cs = 51, tf_eflags = 582, tf_esp = -1077941252, tf_ss = 59}) at /usr/src/sys/i386/i386/trap.c:984 #19 0xc06c765f in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:200 #20 0x00000033 in ?? () Previous frame inner to this frame (corrupt stack?) (kgdb) frame 7 #7 0xc0528441 in devfs_rule_match (dk=0xc559b700, de=0xc5758780) at /usr/src/sys/fs/devfs/devfs_rule.c:546 546 if (dev == NULL || (kgdb) list 541 * be run (such as if there are no conditions). 542 * 543 * XXX: lacks threadref on dev 544 */ 545 if (dr->dr_icond & DRC_DSWFLAGS) 546 if (dev == NULL || 547 (dev->si_devsw->d_flags & dr->dr_dswflags) == 0) 548 return (0); 549 if (dr->dr_icond & DRC_PATHPTRN) 550 if (!devfs_rule_matchpath(dk, de)) >How-To-Repeat: # mkdir dev # mount -t devfs devfs dev # devfs -m dev ruleset 50 # devfs -m dev rule add type disk hide # devfs -m dev rule applyset >Fix: In /usr/src/sys/fs/devfs/devfs_rule.c:546 if (dev == NULL || Change into: if (dev == NULL || dev->si_devsw == NULL || I changed this and recompiled, the crash didn't occur anymore. >Release-Note: >Audit-Trail: >Unformatted:
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