From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [203.10.76.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx.ozlabs.org", Issuer "CA Cert Signing Authority" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id 69F37B6F31 for ; Mon, 24 Aug 2009 17:01:52 +1000 (EST) Message-ID: <4A923AD3.1020507@in.ibm.com> Date: Mon, 24 Aug 2009 12:31:39 +0530 From: Sachin Sant MIME-Version: 1.0 To: linuxppc-dev@ozlabs.org Subject: 2.6.31-rc7 : kernel BUG at drivers/rtc/rtc-ps3.c:36! Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: cbe-oss-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , While trying to boot 2.6.31-rc7 on a power6 machine came across the following Bug. Starting udev: ------------[ cut here ]------------ kernel BUG at drivers/rtc/rtc-ps3.c:36! cpu 0x0: Vector: 700 (Program Check) at [c0000000f70f3570] pc: c00000000059a020: .ps3_get_time+0x3c/0x84 lr: c00000000059a018: .ps3_get_time+0x34/0x84 sp: c0000000f70f37f0 msr: 8000000000029032 current = 0xc0000000f8d14ee0 paca = 0xc0000000012cc300 pid = 159, comm = hwclock kernel BUG at drivers/rtc/rtc-ps3.c:36! enter ? for help [c0000000f70f3890] c000000000593918 .rtc_read_time+0xac/0xe8 [c0000000f70f3930] c000000000594508 .rtc_dev_ioctl+0x358/0x5a4 [c0000000f70f3a40] c0000000001df868 .vfs_ioctl+0x70/0x10c [c0000000f70f3af0] c0000000001e00a0 .do_vfs_ioctl+0x6d8/0x748 [c0000000f70f3be0] c0000000001e0198 .SyS_ioctl+0x88/0xd0 [c0000000f70f3ca0] c000000000221fc8 .do_ioctl32_pointer+0x3c/0x5c [c0000000f70f3d40] c000000000226ef0 .compat_sys_ioctl+0x43c/0x4c4 [c0000000f70f3e30] c0000000000085f0 syscall_exit+0x0/0x40 --- Exception: c01 (System Call) at 000000000fee33e8 SP (ffe0c7d0) is in userspace 0:mon> 0:mon> di $.ps3_get_time c000000000599fe4 7c0802a6 mflr r0 c000000000599fe8 f8010010 std r0,16(r1) c000000000599fec fb81ffe0 std r28,-32(r1) c000000000599ff0 fba1ffe8 std r29,-24(r1) c000000000599ff4 fbe1fff8 std r31,-8(r1) c000000000599ff8 f821ff61 stdu r1,-160(r1) c000000000599ffc 7c3f0b78 mr r31,r1 c00000000059a000 7c9d2378 mr r29,r4 c00000000059a004 60000000 nop ... c00000000059a00c 387f0070 addi r3,r31,112 c00000000059a010 389f0078 addi r4,r31,120 c00000000059a014 4baf1235 bl c00000000008b248 # ._lv1_get_rtc+0x0/0x3c c00000000059a018 60000000 nop c00000000059a01c 7c6307b4 extsw r3,r3 c00000000059a020 0b030000 tdnei r3,0 0:mon> 0:mon> r R00 = c00000000059a018 R16 = 0000000000000000 R01 = c0000000f70f37f0 R17 = 00000000ffe0cb50 R02 = c000000001274d30 R18 = 0000000000000000 R03 = fffffffffffffffe R19 = 0000000010020000 R04 = c0000000f70f3868 R20 = 0000000000000000 R05 = 0000000000000004 R21 = 0000000000033790 R06 = c0000000f70f39d4 R22 = 000000004a923592 R07 = 0000000000000000 R23 = 0000000000000001 R08 = 07c0000000000000 R24 = 0000000040247009 R09 = c00000000125d708 R25 = c000000000783208 R10 = c0000000f742cf80 R26 = ffffffffffffffea R11 = c0000000f70f3868 R27 = c0000000f70f39b0 R12 = 0000000000004000 R28 = c0000000f742cd10 R13 = c0000000012cc300 R29 = c0000000f70f39b0 R14 = 0000000010019d40 R30 = c000000001213148 R15 = 00000000ffe0cc7b R31 = c0000000f70f37f0 pc = c00000000059a020 .ps3_get_time+0x3c/0x84 lr = c00000000059a018 .ps3_get_time+0x34/0x84 msr = 8000000000029032 cr = 44222424 ctr = c000000000599fe4 xer = 0000000000000001 trap = 700 0:mon> Corresponding c code is : static u64 read_rtc(void) { .... result = lv1_get_rtc(&rtc_val, &tb_val); BUG_ON(result); I had never tried enabling CONFIG_RTC_DRV_PS3 option before so not sure if this is a new problem or an old one. Thanks -Sachin -- --------------------------------- Sachin Sant IBM Linux Technology Center India Systems and Technology Labs Bangalore, India ---------------------------------