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Message-Id: <200704201306.08066.m.gruber@tirol.com> Date: Fri, 20 Apr 2007 13:06:08 +0200 From: Manfred Gruber <m.gruber@...ol.com> To: linux-kernel@...r.kernel.org Cc: jan.altenberg@...utronix.de, tglx@...utronix.de, mingo@...e.hu Subject: preempt_rt bug or warn on arm v4t Hi ! I am using 2.6.21-rc7 with Preempt_rt Patch 2.6.20-rc6-rt0 on ep93xx. This oops does not trigger in preempt_rt patch is applied. On startup i get following oops when preemption is none. Mount-cache hash table entries: 512 CPU: Testing write buffer coherency: ok BUG: at kernel/sched.c:4285 __schedule() [<c006d404>] (dump_stack+0x0/0x14) from [<c02eeea4>] (__schedule+0x844/0x8e0) [<c02ee660>] (__schedule+0x0/0x8e0) from [<c02ef038>] (schedule+0xd0/0x118) [<c02eef68>] (schedule+0x0/0x118) from [<c02ef3e0>] (wait_for_completion+0x94/0xf0) r4 = C042DE88 [<c02ef34c>] (wait_for_completion+0x0/0xf0) from [<c0099c14>] (keventd_create_kthread+0x3c/0x74) r7 = 00000000 r6 = 00000002 r5 = C042DED4 r4 = C042DF18 [<c0099bd8>] (keventd_create_kthread+0x0/0x74) from [<c0099ccc>] (kthread_create+0x80/0xc8) r6 = C001C320 r5 = C042DED4 r4 = 00000000 [<c0099c4c>] (kthread_create+0x0/0xc8) from [<c009ad48>] (posix_cpu_thread_call+0x40/0xb8) r3 = 00000000 r2 = C0352BD0 r5 = 00000000 r4 = 00000000 [<c009ad08>] (posix_cpu_thread_call+0x0/0xb8) from [<c000dd10>] (posix_cpu_thread_init+0x24/0x40) r5 = 00000000 r4 = C03A7F74 [<c000dcec>] (posix_cpu_thread_init+0x0/0x40) from [<c00088b0>] (init+0x38/0x30c) r4 = 00000000 [<c0008878>] (init+0x0/0x30c) from [<c0087b90>] (do_exit+0x0/0x80c) NET: Registered protocol family 16 ep93xx: PLL1 running at 400 MHz, PLL2 at 192 MHz ep93xx: FCLK 200 MHz, HCLK 100 MHz, PCLK 50 MHz SCSI subsystem initialized usbcore: registered new interface driver usbfs If I enable full preemp_rt i get a warn: irq event stamp: 0 hardirqs last enabled at (0): [<00000000>] __init_begin+0x3fff8000/0x30 hardirqs last disabled at (0): [<c00850f4>] copy_process+0x344/0x124c softirqs last enabled at (0): [<c00850f4>] copy_process+0x344/0x124c softirqs last disabled at (0): [<00000000>] __init_begin+0x3fff8000/0x30 BUG: at kernel/sched.c:4288 __schedule() [<c006e71c>] (dump_stack+0x0/0x28) from [<c0308b64>] (__schedule+0xa04/0xab4) [<c0308160>] (__schedule+0x0/0xab4) from [<c0308e28>] (schedule+0xdc/0x128) [<c0308d4c>] (schedule+0x0/0x128) from [<c009d760>] (kthread+0xcc/0x12c) r4 = C0B72000 [<c009d694>] (kthread+0x0/0x12c) from [<c008a508>] (do_exit+0x0/0x814) r7 = 00000000 r6 = 00000000 r5 = 00000000 r4 = 00000000 --------------------------- | preempt count: 00000000 ] | 0-level deep critical section nesting: Does someone has an idea what is wrong ? The configs can be found here: https://dev.contec.at/dev/micro/micro9/LINUX/trunk/kernel/linux-2.6-config/ My quilt queue can be found here: https://dev.contec.at/dev/micro/micro9/LINUX/trunk/kernel/linux-2.6/patches/ thanks regards manfred - 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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