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Date: Tue, 04 Aug 2009 07:37:45 -0700 From: Darren Hart <dvhltc@...ibm.com> To: linux-rt-users <linux-rt-users@...r.kernel.org>, "lkml, " <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>, Dinakar Guniguntala <dino@...ibm.com> Subject: 2.6.31-rc4-rt1: BUG: panic in requeue_pi test case Using a slightly modified version of pthread_cond_many from ltp/testcases/realtime/perf/latency I tripped over the following crash while using a patched glibc to make use of the new futex requeue_pi syscalls. The changes to the test boil down to making the "child_mutex" PI aware. The unmodified test ran for 10 hours using the old futex behavior (stock glibc). I'll do some more investigation and see if I can reproduce on mainline, or on a 2.6.29 rt kernel. Kernel panic - not syncing: softlockup: hung tasks BUG: soft lockup - CPU#5 stuck for 61s! [pthread_cond_ma:30534] Modules linked in: ipv6 autofs4 i2c_dev i2c_core hidp rfcomm l2cap bluetooth rfkill sunrpc dm_mirror dm_multipath scsi_dh video output sbs sbshc battery ac parport_pc lp parport sg snd_seq_dummy snd_seq_oss button serio_raw bnx2 bnx2x snd_seq_midi_event snd_seq i5k_amb hwmon crc32c snd_seq_device i5000_edac pata_acpi snd_pcm_oss iTCO_wdt ata_generic snd_mixer_oss edac_core iTCO_vendor_support libcrc32c snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr dm_region_hash dm_log dm_mod ata_piix libata shpchp mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd Modules linked in: ipv6 autofs4 i2c_dev i2c_core hidp rfcomm l2cap bluetooth rfkill sunrpc dm_mirror dm_multipath scsi_dh video output sbs sbshc battery ac parport_pc lp parport sg snd_seq_dummy snd_seq_oss button serio_raw bnx2 bnx2x snd_seq_midi_event snd_seq i5k_amb hwmon crc32c snd_seq_device i5000_edac pata_acpi snd_pcm_oss iTCO_wdt ata_generic snd_mixer_oss edac_core iTCO_vendor_support libcrc32c snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr dm_region_hash dm_log dm_mod ata_piix libata shpchp mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd Call Trace: [<ffffffff813fe78a>] ? rt_spin_lock_slowlock+0xdb/0x1b9 [<ffffffff813fe6af>] ? rt_spin_lock_slowlock+0x0/0x1b9 [<ffffffff8108de6d>] ? rt_spin_lock_fastlock+0x77/0x93 [<ffffffff813feddf>] ? rt_spin_lock+0x28/0x3e [<ffffffff8108a6c8>] ? queue_lock+0x46/0x66 [<ffffffff8108bcc0>] ? futex_lock_pi+0xf9/0x2c1 [<ffffffff8113a59b>] ? __pollwait+0x0/0x107 [<ffffffff813ff581>] ? _atomic_spin_unlock_irqrestore+0x49/0x68 [<ffffffff8108e296>] ? rt_mutex_adjust_prio+0x49/0x68 [<ffffffff8108ddc5>] ? rt_spin_lock_fastunlock+0x54/0x85 [<ffffffff8108cc43>] ? do_futex+0x7e2/0xb41 [<ffffffff810421a0>] ? pick_next_task_idle+0x2b/0x4d [<ffffffff81060809>] ? timespec_add_safe+0x4b/0x94 [<ffffffff8100cdde>] ? apic_timer_interrupt+0xe/0x20 [<ffffffff8108d0c7>] ? sys_futex+0x125/0x157 [<ffffffff8100c29b>] ? system_call_fastpath+0x16/0x1b Kernel panic - not syncing: softlockup: hung tasks BUG: soft lockup - CPU#6 stuck for 61s! [pthread_cond_ma:30536] Modules linked in: ipv6 autofs4 i2c_dev i2c_core hidp rfcomm l2cap bluetooth rfkill sunrpc dm_mirror dm_multipath scsi_dh video output sbs sbshc battery ac parport_pc lp parport sg snd_seq_dummy snd_seq_oss button serio_raw bnx2 bnx2x snd_seq_midi_event snd_seq i5k_amb hwmon crc32c snd_seq_device i5000_edac pata_acpi snd_pcm_oss iTCO_wdt ata_generic snd_mixer_oss edac_core iTCO_vendor_support libcrc32c snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr dm_region_hash dm_log dm_mod ata_piix libata shpchp mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd Modules linked in: ipv6 autofs4 i2c_dev i2c_core hidp rfcomm l2cap bluetooth rfkill sunrpc dm_mirror dm_multipath scsi_dh video output sbs sbshc battery ac parport_pc lp parport sg snd_seq_dummy snd_seq_oss button serio_raw bnx2 bnx2x snd_seq_midi_event snd_seq i5k_amb hwmon crc32c snd_seq_device i5000_edac pata_acpi snd_pcm_oss iTCO_wdt ata_generic snd_mixer_oss edac_core iTCO_vendor_support libcrc32c snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr dm_region_hash dm_log dm_mod ata_piix libata shpchp mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd Call Trace: [<ffffffff813fe78a>] ? rt_spin_lock_slowlock+0xdb/0x1b9 [<ffffffff813fe6af>] ? rt_spin_lock_slowlock+0x0/0x1b9 [<ffffffff8108de6d>] ? rt_spin_lock_fastlock+0x77/0x93 [<ffffffff813feddf>] ? rt_spin_lock+0x28/0x3e [<ffffffff8108a6c8>] ? queue_lock+0x46/0x66 [<ffffffff8108bcc0>] ? futex_lock_pi+0xf9/0x2c1 [<ffffffff8113a59b>] ? __pollwait+0x0/0x107 [<ffffffff8108e296>] ? rt_mutex_adjust_prio+0x49/0x68 [<ffffffff813fe692>] ? rt_spin_lock_slowunlock+0x6f/0x8c [<ffffffff813fe623>] ? rt_spin_lock_slowunlock+0x0/0x8c [<ffffffff8108ddd9>] ? rt_spin_lock_fastunlock+0x68/0x85 [<ffffffff8108cc43>] ? do_futex+0x7e2/0xb41 [<ffffffff810421a0>] ? pick_next_task_idle+0x2b/0x4d [<ffffffff81060809>] ? timespec_add_safe+0x4b/0x94 [<ffffffff8100cdde>] ? apic_timer_interrupt+0xe/0x20 [<ffffffff8108d0c7>] ? sys_futex+0x125/0x157 [<ffffffff8100c29b>] ? system_call_fastpath+0x16/0x1b Kernel panic - not syncing: softlockup: hung tasks BUG: soft lockup - CPU#7 stuck for 61s! [pthread_cond_ma:30537] Modules linked in: ipv6 autofs4 i2c_dev i2c_core hidp rfcomm l2cap bluetooth rfkill sunrpc dm_mirror dm_multipath scsi_dh video output sbs sbshc battery ac parport_pc lp parport sg snd_seq_dummy snd_seq_oss button serio_raw bnx2 bnx2x snd_seq_midi_event snd_seq i5k_amb hwmon crc32c snd_seq_device i5000_edac pata_acpi snd_pcm_oss iTCO_wdt ata_generic snd_mixer_oss edac_core iTCO_vendor_support libcrc32c snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr dm_region_hash dm_log dm_mod ata_piix libata shpchp mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd Modules linked in: ipv6 autofs4 i2c_dev i2c_core hidp rfcomm l2cap bluetooth rfkill sunrpc dm_mirror dm_multipath scsi_dh video output sbs sbshc battery ac parport_pc lp parport sg snd_seq_dummy snd_seq_oss button serio_raw bnx2 bnx2x snd_seq_midi_event snd_seq i5k_amb hwmon crc32c snd_seq_device i5000_edac pata_acpi snd_pcm_oss iTCO_wdt ata_generic snd_mixer_oss edac_core iTCO_vendor_support libcrc32c snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr dm_region_hash dm_log dm_mod ata_piix libata shpchp mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd Call Trace: [<ffffffff813fe78a>] ? rt_spin_lock_slowlock+0xdb/0x1b9 [<ffffffff813fe6af>] ? rt_spin_lock_slowlock+0x0/0x1b9 [<ffffffff8108de6d>] ? rt_spin_lock_fastlock+0x77/0x93 [<ffffffff813feddf>] ? rt_spin_lock+0x28/0x3e [<ffffffff8108a6c8>] ? queue_lock+0x46/0x66 [<ffffffff8108bcc0>] ? futex_lock_pi+0xf9/0x2c1 [<ffffffff8113a59b>] ? __pollwait+0x0/0x107 [<ffffffff8108e296>] ? rt_mutex_adjust_prio+0x49/0x68 [<ffffffff813fe692>] ? rt_spin_lock_slowunlock+0x6f/0x8c [<ffffffff813fe623>] ? rt_spin_lock_slowunlock+0x0/0x8c [<ffffffff8108ddd9>] ? rt_spin_lock_fastunlock+0x68/0x85 [<ffffffff8108cc43>] ? do_futex+0x7e2/0xb41 [<ffffffff810421a0>] ? pick_next_task_idle+0x2b/0x4d [<ffffffff81060809>] ? timespec_add_safe+0x4b/0x94 [<ffffffff8108d0c7>] ? sys_futex+0x125/0x157 [<ffffffff8100c29b>] ? system_call_fastpath+0x16/0x1b Kernel panic - not syncing: softlockup: hung tasks -- Darren Hart IBM Linux Technology Center Real-Time Linux Team -- 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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