Hi list,
I ran in another issue while updating our coldfire 5329 board from linux 2.6.25 to linux 3.6. Romfs is mounted as root and then the system says BUG: scheduling while atomic: swapper/0/0x00000000 and is finally crashing after some trace output. The system is configured to behave a preemptive system (low latency desktop) but the system also crashes without preemption activated. Does somebody know in which direction to look and how to tackle this issue? What is the best way to track it down and fix this? Let me know if there is more information needed than the boot up messages below show. Best Regards Christian dBUG> dn Downloading Image 'image.bin' from 192.168.10.254 TFTP transfer completed Read 4647940 bytes (9079 blocks) dBUG> go 0x40020000 Linux version 3.6.11 (christ...@cglinux.eks-engel.local) (gcc version 4.6.1 (Sourcery CodeBench Lite 2011.09-23) ) #72 PREEMPT Tue Mar 5 17:32:05 CET 2013 uClinux/COLDFIRE(m532x) COLDFIRE port done by Greg Ungerer, g...@snapgear.com Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne Built 1 zonelists in Zone order, mobility grouping off. Total pages: 2024 Kernel command line: rootfstype=romfs console=tty1 console=ttyS0,115200 root=/dev/mtdblock0 PID hash table entries: 64 (order: -5, 256 bytes) Dentry cache hash table entries: 2048 (order: 0, 8192 bytes) Inode-cache hash table entries: 2048 (order: 0, 8192 bytes) Memory available: 11392k/16256k RAM, (1736k kernel code, 631k data) NR_IRQS:256 Calibrating delay loop... HZ=100 15.46 BogoMIPS (lpj=77312) pid_max: default: 32768 minimum: 301 Mount-cache hash table entries: 1024 NET: Registered protocol family 16 bio: create slab <bio-0> at 0 Switching to clocksource tmr NET: Registered protocol family 2 TCP established hash table entries: 1024 (order: 0, 8192 bytes) TCP bind hash table entries: 1024 (order: -1, 4096 bytes) TCP: Hash tables configured (established 1024 bind 1024) TCP: reno registered UDP hash table entries: 512 (order: 0, 8192 bytes) UDP-Lite hash table entries: 512 (order: 0, 8192 bytes) NET: Registered protocol family 1 jffs2: version 2.2. (NAND) C 2001-2006 Red Hat, Inc. ROMFS MTD (C) 2007 Red Hat, Inc. msgmni has been set to 22 io scheduler noop registered io scheduler deadline registered io scheduler cfq registered (default) ColdFire internal UART serial driver ttyS0 at MMIO 0xfc060000 (irq = 90) is a ColdFire UART console [ttyS0] enabled ttyS1 at MMIO 0xfc064000 (irq = 91) is a ColdFire UART ttyS2 at MMIO 0xfc068000 (irq = 92) is a ColdFire UART brd: module loaded uclinux[mtd]: RAM probe address=0x4026fd40 size=0x22c000 Creating 1 MTD partitions on "RAM": 0x000000000000-0x00000022c000 : "ROMfs" el5329 flash device: 1000000 at 0 el5329 flash: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 0x000001 Chip ID 0x002101 Amd/Fujitsu Extended Query Table at 0x0040 Amd/Fujitsu Extended Query version 1.3. number of CFI chips: 1 Creating 7 MTD partitions on " el5329 flash": 0x000000000000-0x000000020000 : "vectors" 0x000000020000-0x000000040000 : "user_parameters" 0x000000040000-0x000000060000 : "system_parameters" 0x000000060000-0x000000100000 : "bootloader" 0x000000100000-0x000000700000 : "kernel_partition1" 0x000000700000-0x000000d00000 : "partition2" 0x000000d00000-0x000001000000 : "user_data" BUG: scheduling while atomic: swapper/0/0x00000000 Modules linked in: Call Trace: [<401cf054>] __schedule_bug+0x40/0x52 [<401d160e>] __schedule+0x33e/0x3c0 [<401d1bf0>] schedule+0x38/0x54 [<401d1d90>] schedule_preempt_disabled+0x18/0x24 [<401cdd62>] rest_init+0x72/0x82 [<401ced70>] printk+0x0/0x20 [<40252678>] start_kernel+0x2e8/0x2f4 [<400200da>] _exit+0x0/0x6 ------------[ cut here ]------------ WARNING: at kernel/rcutiny.c:135 rcu_idle_exit_common.part.8+0x56/0x66() Current pid: 45 comm: kworker/u:1 / Idle pid: 0 comm: swapper Modules linked in: Call Trace: [<400260f8>] warn_slowpath_common+0x50/0x6a [<40026190>] warn_slowpath_fmt+0x2a/0x32 [<40060474>] rcu_idle_exit_common.part.8+0x56/0x66 [<40060474>] rcu_idle_exit_common.part.8+0x56/0x66 [<400607ea>] rcu_irq_enter+0x62/0x98 [<4002dbf4>] irq_enter+0xa/0x60 [<4002081c>] do_IRQ+0x1c/0x3c [<400233ea>] inthandler+0x2a/0x34 [<40041e40>] exit_itimers+0x8/0x16e [<4002b778>] do_exit+0x524/0x888 [<4002be26>] sys_exit+0x0/0x16 [<4003ac12>] wait_for_helper+0x0/0x96 [<4002be3c>] do_group_exit+0x0/0xf8 [<400232d8>] system_call+0x48/0x86 [<4003ac12>] wait_for_helper+0x0/0x96 [<40020a90>] kernel_thread+0x3a/0x42 ---[ end trace 6786da2dfad7182c ]--- ------------[ cut here ]------------ WARNING: at kernel/rcutiny.c:75 rcu_idle_enter_common.isra.9.part.10+0x6c/0x88() Current pid: 45 comm: kworker/u:1 / Idle pid: 0 comm: swapper Modules linked in: Call Trace: [<400260f8>] warn_slowpath_common+0x50/0x6a [<40026190>] warn_slowpath_fmt+0x2a/0x32 [<40060922>] rcu_idle_enter_common.isra.9.part.10+0x6c/0x88 [<40060922>] rcu_idle_enter_common.isra.9.part.10+0x6c/0x88 [<4006098c>] rcu_irq_exit+0x4e/0x98 [<4002dc7c>] irq_exit+0x32/0x60 [<4002082c>] do_IRQ+0x2c/0x3c [<400233ea>] inthandler+0x2a/0x34 [<40041e40>] exit_itimers+0x8/0x16e [<4002b778>] do_exit+0x524/0x888 [<4002be26>] sys_exit+0x0/0x16 [<4003ac12>] wait_for_helper+0x0/0x96 [<4002be3c>] do_group_exit+0x0/0xf8 [<400232d8>] system_call+0x48/0x86 [<4003ac12>] wait_for_helper+0x0/0x96 [<40020a90>] kernel_thread+0x3a/0x42 ---[ end trace 6786da2dfad7182d ]--- libphy: fec_enet_mii_bus: probed TCP: cubic registered NET: Registered protocol family 17 Name=/dev/root, fs=romfs, flags=32769, data=0 VFS: Mounted root (romfs filesystem) readonly on device 31:0. Freeing unused kernel memory: 64k freed (0x40252000 - 0x40260000)
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