Hi, I'm getting reproductible kernel panic when I use smaller SLOB allocator (instead of SLAB). This is reproductible but very randomly -- sometimes it happens during bootup, sometimes few minutes later.
Hardware is custom board with IBM405EP (very close to Bubingna, just no RTC): # cat /proc/cpuinfo processor : 0 cpu : 405EP clock : 200MHz revision : 9.80 (pvr 5121 0950) bogomips : 199.47 machine : MagicBox plb bus clock : 100MHz pci bus clock : 25MHz Enabling SLAB instead of SLOB fixes this, so I assume this is driver issue. Full dmesg attached: Linux version 2.6.17-magicbox2 (builder at riddly) (gcc version 3.4.5) #2 Tue Aug 1 20:58:00 CEST 2006 MagicBox port (C) 2005 Karol Lewandowski <kl at jasmine.eu.org> Built 1 zonelists Kernel command line: console=ttyS0,115200 root=/dev/ram rw PID hash table entries: 256 (order: 8, 1024 bytes) Dentry cache hash table entries: 4096 (order: 2, 16384 bytes) Inode-cache hash table entries: 2048 (order: 1, 8192 bytes) Memory: 28272k available (1544k kernel code, 508k data, 100k init, 0k highmem) Mount-cache hash table entries: 512 checking if image is initramfs...it isn't (bad gzip magic numbers); looks like an initrd Freeing initrd memory: 2020k freed NET: Registered protocol family 16 PCI: Probing PCI hardware TC classifier action (bugs to netdev at vger.kernel.org cc hadi at cyberus.ca) NET: Registered protocol family IP route cache hash table entries: 256 (order: -2, 1024 bytes) TCP established hash table entries: 1024 (order: 0, 4096 bytes) TCP bind hash table entries: 512 (order: -1, 2048 bytes) TCP: Hash tables configured (established 1024 bind 512) TCP reno registered squashfs: version 3.0 (2006/03/15) Phillip Lougher Initializing Cryptographic API io scheduler noop registered (default) Software Watchdog Timer: 0.07 initialized. soft_noboot=0 soft_margin=60 sec (nowayout= 0) Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled serial8250: ttyS0 at MMIO 0x0 (irq = 0) is a 16550A serial8250: ttyS1 at MMIO 0x0 (irq = 1) is a 16550A RAMDISK driver initialized: 4 RAM disks of 8192K size 1024 blocksize PPC 4xx OCP EMAC driver, version 3.54 mal0: initialized, 4 TX channels, 2 RX channels eth0: emac0, MAC 00:50:c2:1e:af:fe eth0: found Generic MII PHY (0x00) emac1: reset timeout emac1: can't find PHY! tun: Universal TUN/TAP device driver, 1.6 tun: (C) 1999-2004 Max Krasnyansky <maxk at qualcomm.com> Magically mapped flash: Found 1 x16 devices at 0x0 in 16-bit bank Amd/Fujitsu Extended Query Table at 0x0040 Magically mapped flash: Swapping erase regions for broken CFI table. number of CFI chips: 1 cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness. Creating 4 MTD partitions on "Magically mapped flash": 0x00000000-0x000e0000 : "kernel" 0x000e0000-0x003a0000 : "ramdisk" 0x003a0000-0x003c0000 : "persistent" 0x003c0000-0x00400000 : "bootloader" i2c /dev entries driver IBM IIC driver v2.1 ibm-iic0: using standard (100 kHz) mode u32 classifier Actions configured GRE over IPv4 tunneling driver ip_conntrack version 2.4 (256 buckets, 2048 max) - 236 bytes per conntrack ip_tables: (C) 2000-2006 Netfilter Core Team TCP bic registered NET: Registered protocol family 1 NET: Registered protocol family 17 Bridge firewalling registered 802.1Q VLAN Support v1.8 Ben Greear <greearb at candelatech.com> All bugs added by David S. Miller <davem at redhat.com> RAMDISK: squashfs filesystem found at block 0 RAMDISK: Loading 2017KiB [1 disk] into ram disk... VFS: Mounted root (squashfs filesystem) readonly. Freeing unused kernel memory: 100k init Oops: kernel access of bad area, sig: 11 [#1] NIP: C000BEF8 LR: C00D247C CTR: 00000006 REGS: c1993d80 TRAP: 0300 Not tainted (2.6.17-magicbox2) MSR: 00029030 <EE,ME,IR,DR> CR: 44000024 XER: 20000000 DAR: FFFFFFFE, DSISR: 00000000 TASK = c01ef000[331] 'echo' THREAD: c1992000 GPR00: 00000006 C1993E30 C01EF000 C19D1828 FFFFFFFA 00000026 C19D1824 C19D1866 GPR08: 00000000 C19D182A 00000001 00000000 42000028 70000000 00000001 10080000 GPR16: 00000000 30014C34 00000000 30000000 00000000 00000000 00000020 00000000 GPR24: C1C7D8A4 00000001 0000003C 0000003E 00000008 C19D1770 C1951680 C1C7D800 NIP [C000BEF8] cacheable_memcpy+0x64/0x108 LR [C00D247C] emac_poll_rx+0x150/0x6e8 Call Trace: [C1993E30] [C00D244C] emac_poll_rx+0x120/0x6e8 (unreliable) [C1993E80] [C00D0508] mal_poll+0x90/0x284 [C1993EB0] [C00F9CB0] net_rx_action+0xb4/0x1b0 [C1993EE0] [C001D0C4] __do_softirq+0x64/0xe0 [C1993F00] [C0007AC0] do_softirq+0x50/0x74 [C1993F10] [C001D1E0] irq_exit+0x38/0x48 [C1993F20] [C0007A5C] do_IRQ+0x64/0x78 [C1993F40] [C0003478] ret_from_except+0x0/0x18 Instruction dump: 70080003 7ca02850 7d0903a6 41a20018 89240004 99260004 38840001 38c60001 4200fff0 5400f0bf 7c0903a6 41820010 <85240004> 95260004 4200fff8 54a0d97f Kernel panic - not syncing: Aiee, killing interrupt handler! <0>Rebooting in 180 seconds.. thanks -- This signature intentionally says nothing.