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Message-Id: <1273511465.21774.11.camel@localhost.localdomain> Date: Mon, 10 May 2010 10:11:05 -0700 From: Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU> To: john stultz <johnstul@...ibm.com> Cc: nando@...ma.Stanford.EDU, Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, rt-users <linux-rt-users@...r.kernel.org>, Steven Rostedt <rostedt@...dmis.org>, Nick Piggin <npiggin@...e.de> Subject: Re: 2.6.33.3-rt19 kernel BUG's On Fri, 2010-05-07 at 17:39 -0700, john stultz wrote: > On Fri, 2010-05-07 at 23:58 +0000, Fernando Lopez-Lezcano wrote: > > On Fri, 2010-05-07 at 16:43 -0700, john stultz wrote: > > > On Fri, 2010-05-07 at 12:41 +0200, Thomas Gleixner wrote: > > > > On Thu, 6 May 2010, Fernando Lopez-Lezcano wrote: > > > > > > > > CC'ed John and Nick > > > > > > > > > See below... just trying to boot (quad core desktop machine). > > > > > > Ok. Got this to reproduce. Will hopefully have a fix for your soon. > > > > > > Thanks for the bug report! > > > > Thanks for looking at it! It had been a while since I had problems with > > rt so I could not understand why I could not login :-) > > Bah! I should have caught this faster. I kept thinking it had to be some > missed unlock of the sbi->fs_lock, but it ends up its just the > autofs4_lock. > > Apparently the conversion from using the dcache_lock -> autofs4_lock > forgot that this function already grabs the autofs_lock for a small > moment, so we end up grabbing the lock, then a moment later grab it > again. Splat. > > This patch should resolve it. I'm still having problems when trying to use autofs, even with your previous patch: May 10 10:03:38 cmn3 kernel: ------------[ cut here ]------------ May 10 10:03:38 cmn3 kernel: kernel BUG at kernel/rtmutex.c:808! May 10 10:03:38 cmn3 kernel: invalid opcode: 0000 [#1] PREEMPT SMP May 10 10:03:38 cmn3 kernel: last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map May 10 10:03:38 cmn3 kernel: Modules linked in: autofs4 xt_time xt_connlimit xt_realm iptable_raw xt_comment xt_policy ipt_ULOG ipt_REDIRECT ipt_NETMAP ipt_MASQUERADE ipt_LOG ipt_ECN ipt_ecn ipt_CLUSTERIP ipt_ah ipt_addrtype nf_nat_tftp nf_nat_snmp_basic nf_nat_sip nf_nat_pptp nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda ts_kmp nf_conntrack_amanda nf_conntrack_sane nf_conntrack_tftp nf_conntrack_sip nf_conntrack_proto_sctp nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netlink nf_conntrack_netbios_ns nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp xt_tcpmss xt_recent xt_pkttype xt_physdev xt_owner xt_NFQUEUE xt_NFLOG nfnetlink_log xt_multiport xt_MARK xt_mark xt_mac xt_limit xt_length xt_iprange xt_helper xt_hashlimit xt_DSCP xt_dscp xt_dccp xt_CONNMARK xt_connmark xt_CLASSIFY iptable_nat nf_nat iptable_mangle nfnetlink coretemp hwmon_vid nfs lockd fscache nfs_acl auth_rpcgss sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 cpufreq_ondemand acpi_cpufreq dm_mul May 10 10:03:38 cmn3 kernel: tipath uinput snd_hda_codec_realtek snd_ice1712 snd_ice17xx_ak4xxx snd_hda_intel snd_ak4xxx_adda snd_hda_codec snd_cs8427 snd_ac97_codec snd_hwdep snd_seq snd_pcm ac97_bus snd_i2c snd_mpu401_uart snd_rawmidi snd_seq_device joydev snd_timer snd asus_atk0110 iTCO_wdt sata_sil24 ohci1394 soundcore i2c_i801 sky2 serio_raw snd_page_alloc iTCO_vendor_support ata_generic pata_acpi radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: microcode] May 10 10:03:38 cmn3 kernel: May 10 10:03:38 cmn3 kernel: Pid: 4245, comm: ls Not tainted 2.6.33.3-85.rt19.1.fc11.ccrma.i686.rtPAE #1 P5K/EPU/P5K/EPU May 10 10:03:38 cmn3 kernel: EIP: 0060:[<c079201b>] EFLAGS: 00210046 CPU: 2 May 10 10:03:38 cmn3 kernel: EIP is at rt_spin_lock_slowlock+0x43/0x1bb May 10 10:03:38 cmn3 kernel: EAX: f28a04f0 EBX: fba41f00 ECX: fba41f00 EDX: f28a04f0 May 10 10:03:38 cmn3 kernel: ESI: f01e01d0 EDI: f4a4bbc0 EBP: f02fddc4 ESP: f02fdd6c May 10 10:03:38 cmn3 kernel: DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 preempt:00000001 May 10 10:03:38 cmn3 kernel: Process ls (pid: 4245, ti=f02fc000 task=f28a04f0 task.ti=f02fc000) May 10 10:03:38 cmn3 kernel: Stack: May 10 10:03:38 cmn3 kernel: f217dd90 00000001 00000000 00000000 00200296 00000000 00000000 00000000 May 10 10:03:38 cmn3 kernel: <0> 00000000 00000000 00000000 00000000 00200246 f01e01d0 f01e0180 f4a4bbc0 May 10 10:03:38 cmn3 kernel: <0> 00000000 c0464f73 00200246 fba41f00 f01e01d0 f4a4bbc0 f02fddd0 c0464fa9 May 10 10:03:38 cmn3 kernel: Call Trace: May 10 10:03:38 cmn3 kernel: [<c0464f73>] ? rt_spin_lock_fastlock.clone.1+0x26/0x5f May 10 10:03:38 cmn3 kernel: [<c0464fa9>] ? rt_spin_lock_fastlock.clone.1+0x5c/0x5f May 10 10:03:38 cmn3 kernel: [<c0792752>] ? rt_spin_lock+0x8/0xa May 10 10:03:38 cmn3 kernel: [<fba3ea5c>] ? autofs4_follow_link +0xac/0x176 [autofs4] May 10 10:03:38 cmn3 kernel: [<c04e5819>] ? mntput+0x19/0x1b May 10 10:03:38 cmn3 kernel: [<c04d9522>] ? do_follow_link+0xbd/0x25f May 10 10:03:38 cmn3 kernel: [<c04d98fb>] ? link_path_walk+0x237/0x4fc May 10 10:03:38 cmn3 kernel: [<c04d9cc7>] ? path_walk+0x3a/0x84 May 10 10:03:38 cmn3 kernel: [<c04db08b>] ? path_init+0x6e/0x10c May 10 10:03:38 cmn3 kernel: [<c04db24d>] ? do_path_lookup+0x124/0x186 May 10 10:03:38 cmn3 kernel: [<c04dc3ae>] ? user_path_at+0x39/0x5f May 10 10:03:38 cmn3 kernel: [<c04d8d99>] ? page_put_link+0x0/0x1b May 10 10:03:38 cmn3 kernel: [<c04d8db1>] ? page_put_link+0x18/0x1b May 10 10:03:38 cmn3 kernel: [<c04d9e09>] ? generic_readlink+0x64/0x6e May 10 10:03:38 cmn3 kernel: [<c04d5663>] ? vfs_fstatat+0x2d/0x54 May 10 10:03:38 cmn3 kernel: [<c0464f73>] ? rt_spin_lock_fastlock.clone.1+0x26/0x5f May 10 10:03:38 cmn3 kernel: [<c04d575b>] ? vfs_stat+0x13/0x15 May 10 10:03:38 cmn3 kernel: [<c04d5771>] ? sys_stat64+0x14/0x28 May 10 10:03:38 cmn3 kernel: [<c04e5819>] ? mntput+0x19/0x1b May 10 10:03:38 cmn3 kernel: [<c04d904d>] ? path_put+0x15/0x18 May 10 10:03:38 cmn3 kernel: [<c047de61>] ? audit_syscall_entry +0x113/0x135 May 10 10:03:38 cmn3 kernel: [<c047dd39>] ? audit_syscall_exit +0xfa/0x10f May 10 10:03:38 cmn3 kernel: [<c040895f>] ? sysenter_do_call+0x12/0x28 May 10 10:03:38 cmn3 kernel: Code: 7b 08 00 89 45 b8 75 12 8d 43 04 89 43 04 89 43 08 8d 43 0c 89 43 0c 89 43 10 8b 43 14 64 8b 15 2c d1 a5 c0 83 e0 fc 39 c2 75 04 <0f> 0b eb fe 8b 3a 81 ff 08 01 00 00 74 0a 83 ff 02 b8 04 00 00 May 10 10:03:38 cmn3 kernel: EIP: [<c079201b>] rt_spin_lock_slowlock +0x43/0x1bb SS:ESP 0068:f02fdd6c May 10 10:03:38 cmn3 kernel: ---[ end trace 6995ddbbd57ded08 ]--- -- Fernando -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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