From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clark Williams Subject: [RT] RCU splat on 2.6.33.4-rt20 Date: Wed, 19 May 2010 21:19:11 -0500 Message-ID: <20100519211911.5450c1dd@torg> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_//fur=EKJpQNu65jVUZy8Zaf"; protocol="application/pgp-signature" Cc: RT To: Thomas Gleixner , "Paul E. McKenney" Return-path: Received: from mx1.redhat.com ([209.132.183.28]:49578 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752890Ab0ETCzZ (ORCPT ); Wed, 19 May 2010 22:55:25 -0400 Sender: linux-rt-users-owner@vger.kernel.org List-ID: --Sig_//fur=EKJpQNu65jVUZy8Zaf Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Thomas/Paul, Resumed my laptop (T60, 64-bit kernel) and after about five minutes of doing nothing but surfing with firefox, got the following RCU stall notification from a 2.6.33.4-rt20 kernel: INFO: RCU detected CPU 1 stall (t=3D0 jiffies) sending NMI to all CPUs: NMI backtrace for cpu 1 CPU 1=20 Pid: 0, comm: swapper Not tainted 2.6.33.4-rt20 #37 / =20 RIP: 0010:[] [] __const_udelay+0x37/0x44 RSP: 0018:ffff88000a303dc8 EFLAGS: 00000002 RAX: 0000000001062560 RBX: 0000000000000001 RCX: ffff88000a300000 RDX: 000000001dba61d0 RSI: 0000000000000002 RDI: 0000000000418958 RBP: ffff88000a303dc8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88000a30b8b0 R13: ffffffff81a7c800 R14: ffff88000a303f48 R15: ffff88000a30b5e0 FS: 0000000000000000(0000) GS:ffff88000a300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007f5fedd4b000 CR3: 0000000001a56000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper (pid: 0, threadinfo ffff8800bf1d8000, task ffff8800bf1d67c0) Stack: ffff88000a303de8 ffffffff810185aa 000000000000088e ffffffff81a7c800 <0> ffff88000a303e38 ffffffff81092650 ffff8800bf1d9dc8 0000000000000001 <0> ffff88000a303e58 0000000000000001 0000000000000001 0000000000000000 Call Trace: =20 [] arch_trigger_all_cpu_backtrace+0x56/0x62 [] __rcu_pending+0x6e/0x2d3 [] rcu_check_callbacks+0x54/0x15b [] update_process_times+0x46/0x5b [] tick_sched_timer+0x7a/0xa4 [] __run_hrtimer+0x130/0x1bd [] ? tick_sched_timer+0x0/0xa4 [] hrtimer_interrupt+0xdc/0x1dd [] smp_apic_timer_interrupt+0x89/0x9c [] apic_timer_interrupt+0x13/0x20 =20 [] ? acpi_idle_enter_bm+0x2b0/0x2db [] ? acpi_idle_enter_bm+0x2a6/0x2db [] cpuidle_idle_call+0x96/0x11f [] cpu_idle+0xab/0xee [] start_secondary+0x1a5/0x1a9 Code: 00 ff 00 00 48 8d 04 bd 00 00 00 00 65 8b 0c 25 78 ac 00 00 48 63 c9 48 8b 0c cd 60 23 af 81 48 69 94 0a 98 00 00 00 fa 00 00 00 e2 48 8d 7a 01 e8 ad ff ff ff c9 c3 55 48 89 e5 0f 1f 44 00 Call Trace: <#MC> <> Pid: 0, comm: swapper Not tainted 2.6.33.4-rt20 #37 Call Trace: [] ? show_regs+0x2b/0x30 [] nmi_watchdog_tick+0xc2/0x1a6 [] do_nmi+0xb5/0x25b [] nmi+0x1a/0x20 [] ? __const_udelay+0x37/0x44 <> [] arch_trigger_all_cpu_backtrace+0x56/0x62 [] __rcu_pending+0x6e/0x2d3 [] rcu_check_callbacks+0x54/0x15b [] update_process_times+0x46/0x5b [] tick_sched_timer+0x7a/0xa4 [] __run_hrtimer+0x130/0x1bd [] ? tick_sched_timer+0x0/0xa4 [] hrtimer_interrupt+0xdc/0x1dd [] smp_apic_timer_interrupt+0x89/0x9c [] apic_timer_interrupt+0x13/0x20 [] ? acpi_idle_enter_bm+0x2b0/0x2db [] ? acpi_idle_enter_bm+0x2a6/0x2db [] cpuidle_idle_call+0x96/0x11f [] cpu_idle+0xab/0xee [] start_secondary+0x1a5/0x1a9 NMI backtrace for cpu 0 CPU 0=20 Pid: 31, comm: events/0 Not tainted 2.6.33.4-rt20 #37 / =20 RIP: 0010:[] [] rt_worker_func+0xd3/0x2de RSP: 0018:ffff8800bf1ddd80 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000002770 RCX: ffff8800b8a13b80 RDX: 0000000000002770 RSI: ffff8800bf1ddfd8 RDI: ffff8800b893a760 RBP: ffff8800bf1dddf0 R08: ffff8800bf1dc000 R09: ffff8800bf1da800 R10: ffff88000a210000 R11: 0000000000000001 R12: 0000000000006666 R13: 0000000000000000 R14: 00000000000062b0 R15: 0000000000013b80 FS: 0000000000000000(0000) GS:ffff88000a200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007fbe40a86000 CR3: 0000000001a56000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process events/0 (pid: 31, threadinfo ffff8800bf1dc000, task ffff8800bf1da800) Stack: ffff8800bf1dddc0 ffff8800b8a135a0 0000000000000000 ffff8800bf1ddfd8 <0> 0000000000002760 00000000000493e0 0000000000000000 00000000000493e0 <0> ffff8800bf1dc000 ffff88000a212ac0 ffff8800bf1da800 ffff8800bf1dc000 Call Trace: [] worker_thread+0x206/0x2a3 [] ? rt_worker_func+0x0/0x2de [] ? autoremove_wake_function+0x0/0x39 [] ? worker_thread+0x0/0x2a3 [] ? worker_thread+0x0/0x2a3 [] kthread+0x7f/0x87 [] kernel_thread_helper+0x4/0x10 [] ? kthread+0x0/0x87 [] ? kernel_thread_helper+0x0/0x10 Code: 00 00 00 00 4c 89 f9 48 03 0d 98 63 73 00 a8 08 74 15 48 89 55 90 48 89 4d 98 e8 67 3c 07 00 48 8b 4d 98 48 8b 55 90 48 83 39 00 <0f> 84 86 01 00 00 48 63 45 c8 48 89 4d 98 48 89 45 b8 81 e2 ff Call Trace: <#MC> <> Pid: 31, comm: events/0 Not tainted 2.6.33.4-rt20 #37 Call Trace: [] ? show_regs+0x2b/0x30 [] nmi_watchdog_tick+0xc2/0x1a6 [] do_nmi+0xb5/0x25b [] nmi+0x1a/0x20 [] ? rt_worker_func+0xd3/0x2de <> [] worker_thread+0x206/0x2a3 [] ? rt_worker_func+0x0/0x2de [] ? autoremove_wake_function+0x0/0x39 [] ? worker_thread+0x0/0x2a3 [] ? worker_thread+0x0/0x2a3 [] kthread+0x7f/0x87 [] kernel_thread_helper+0x4/0x10 [] ? kthread+0x0/0x87 [] ? kernel_thread_helper+0x0/0x10 --Sig_//fur=EKJpQNu65jVUZy8Zaf Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.13 (GNU/Linux) iEYEARECAAYFAkv0nCIACgkQHyuj/+TTEp0/JgCgo/PC7NqONvLswB70tTN368Rh alwAoNVmDqmMgHugHds9pmRxcZzvMIUT =k0MU -----END PGP SIGNATURE----- --Sig_//fur=EKJpQNu65jVUZy8Zaf--