Hi,
I keep hitting the Oops below on 2.6.39 (arm/AM35xx) using nfsroot.
Note that the board boots most of the time. Any suggestions as to what
might be going on?
Thanks,
Johan
[ 10.777496] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 10.785888] pgd = cfbac000
[ 10.788696] [00000000] *pgd=8fb29831, *pte=00000000, *ppte=00000000
[ 10.795196] Internal error: Oops: 817 [#1] PREEMPT
[ 10.800140] last sysfs file: /sys/kernel/uevent_seqnum
[ 10.805419] Modules linked in:
[ 10.808593] CPU: 0 Tainted: G W (2.6.39+ #100)
[ 10.814361] PC is at dput+0x30/0x1e0
[ 10.818023] LR is at dput+0x24/0x1e0
[ 10.821716] pc : [<c00d8d74>] lr : [<c00d8d68>] psr: 60000013
[ 10.821746] sp : cfb93de8 ip : cfb93de8 fp : cfb93e6c
[ 10.833557] r10: cfb93ebc r9 : cf431c00 r8 : 00100100
[ 10.838928] r7 : 00200200 r6 : cfb92000 r5 : cf440ac0 r4 : cf431c00
[ 10.845672] r3 : 00000000 r2 : cfb92000 r1 : 00000000 r0 : 00000001
[ 10.852386] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 10.859741] Control: 10c5387d Table: 8fbac019 DAC: 00000015
[ 10.865661] Process ldconfig (pid: 189, stack limit = 0xcfb922f0)
[ 10.871948] Stack: (0xcfb93de8 to 0xcfb94000)
[ 10.876434] 3de0: cf9bcc00 cf440ac0 cf4ab480 cfb93ef8 cf4bed28 c012c800
[ 10.884857] 3e00: c03e8ac0 cfb93f78 cf4ab480 00000001 00000001 cfb93ef8 cfb92000 cf431c00
[ 10.893310] 3e20: cfb93ebc c00cf5cc cfb93f00 cf9ec480 cfb93ef8 0000002f cec25009 cfb93f78
[ 10.901733] 3e40: cfb93ef8 00000000 cfb93ebc cfb92000 00000000 cf431c00 00000024 c00d19a4
[ 10.910156] 3e60: cfb93f78 cf9ec480 cf431c00 cf440ac0 c00d0378 cfb93ebc cfb93ef8 00000000
[ 10.918609] 3e80: cec25000 cfb92000 cfb92000 cec25000 cfb93f78 c00d2cdc cfb93ec4 0000029e
[ 10.927032] 3ea0: cf9bec00 0000029e cec25000 cfb93f0c 000000d0 c00d2128 00000074 00000002
[ 10.935455] 3ec0: c03d9a78 00000000 fffffffe cfb93f78 00000001 ffffff9c cec25000 cfb93ef8
[ 10.943908] 3ee0: cfb92000 cec25000 bef5ea7c c00d307c 00000041 cf875888 cf9ec480 cf431c00
[ 10.952331] 3f00: 12150b6a 00000011 cec25009 cf9ec480 cf42d680 cf440ac0 00000101 00000000
[ 10.960754] 3f20: 00000000 00000000 00000040 0000000c 0000012c cf875880 00000004 cfa3bc00
[ 10.969207] 3f40: bef5ea7c cfb93f50 c00ddd8c 00000001 00000000 cf9bf380 00000001 00000000
[ 10.977630] 3f60: 00000000 ffffff9c 00000004 c00c4204 00000001 00000044 00000000 00000000
[ 10.986053] 3f80: 00000024 00000100 fa200000 004d4760 00000008 bef5eb58 00000005 c0033d44
[ 10.994506] 3fa0: 00000000 c0033bc0 004d4760 00000008 bef5eb58 00000000 000001b6 000001b6
[ 11.002929] 3fc0: 004d4760 00000008 bef5eb58 00000005 bef5eb58 bef5eb58 bef5fc60 bef5ea7c
[ 11.011352] 3fe0: 004d4760 bef5ea20 00019084 0002b47c 60000010 bef5eb58 00000000 00000000
[ 11.019805] [<c00d8d74>] (dput+0x30/0x1e0) from [<c012c800>] (nfs_lookup_revalidate+0x2e8/0x490)
[ 11.028900] [<c012c800>] (nfs_lookup_revalidate+0x2e8/0x490) from [<c00cf5cc>] (do_lookup+0x194/0x240)
[ 11.038513] [<c00cf5cc>] (do_lookup+0x194/0x240) from [<c00d19a4>] (do_last+0x194/0x734)
[ 11.046844] [<c00d19a4>] (do_last+0x194/0x734) from [<c00d2cdc>] (path_openat+0xc0/0x380)
[ 11.055297] [<c00d2cdc>] (path_openat+0xc0/0x380) from [<c00d307c>] (do_filp_open+0x30/0x7c)
[ 11.063995] [<c00d307c>] (do_filp_open+0x30/0x7c) from [<c00c4204>] (do_sys_open+0xe0/0x17c)
[ 11.072723] [<c00c4204>] (do_sys_open+0xe0/0x17c) from [<c0033bc0>] (ret_fast_syscall+0x0/0x30)
[ 11.081695] Code: ebfde2a6 e594304c e3530000 1a000001 (e5833000)
[ 11.088043] ---[ end trace 1b75b31a2719ed1e ]---
[ 11.092803] note: ldconfig[189] exited with preempt_count 1
[ 11.098663] BUG: scheduling while atomic: ldconfig/189/0x40000002
[ 11.104949] Modules linked in:
[ 11.108154] [<c0038428>] (unwind_backtrace+0x0/0xec) from [<c02d4a64>] (schedule+0x5c/0x440)
[ 11.116912] [<c02d4a64>] (schedule+0x5c/0x440) from [<c0051910>] (__cond_resched+0x18/0x24)
[ 11.125579] [<c0051910>] (__cond_resched+0x18/0x24) from [<c02d4fcc>] (_cond_resched+0x30/0x40)
[ 11.134613] [<c02d4fcc>] (_cond_resched+0x30/0x40) from [<c00b257c>] (unmap_vmas+0x6f4/0x7b0)
[ 11.143432] [<c00b257c>] (unmap_vmas+0x6f4/0x7b0) from [<c00b4e94>] (exit_mmap+0x108/0x270)
[ 11.152099] [<c00b4e94>] (exit_mmap+0x108/0x270) from [<c00553ac>] (mmput+0x38/0x10c)
[ 11.160217] [<c00553ac>] (mmput+0x38/0x10c) from [<c00592f4>] (exit_mm+0x160/0x168)
[ 11.168151] [<c00592f4>] (exit_mm+0x160/0x168) from [<c005acec>] (do_exit+0x1c8/0x650)
[ 11.176330] [<c005acec>] (do_exit+0x1c8/0x650) from [<c0036e68>] (die+0x29c/0x2d8)
[ 11.184173] [<c0036e68>] (die+0x29c/0x2d8) from [<c003a344>] (__do_kernel_fault+0x64/0x84)
[ 11.192749] [<c003a344>] (__do_kernel_fault+0x64/0x84) from [<c003a5c8>] (do_page_fault+0x264/0x284)
[ 11.202209] [<c003a5c8>] (do_page_fault+0x264/0x284) from [<c002e2b8>] (do_DataAbort+0x34/0x98)
[ 11.211212] [<c002e2b8>] (do_DataAbort+0x34/0x98) from [<c0033610>] (__dabt_svc+0x70/0xa0)
[ 11.219757] Exception stack(0xcfb93da0 to 0xcfb93de8)
[ 11.225006] 3da0: 00000001 00000000 cfb92000 00000000 cf431c00 cf440ac0 cfb92000 00200200
[ 11.233459] 3dc0: 00100100 cf431c00 cfb93ebc cfb93e6c cfb93de8 cfb93de8 c00d8d68 c00d8d74
[ 11.241912] 3de0: 60000013 ffffffff
[ 11.245544] [<c0033610>] (__dabt_svc+0x70/0xa0) from [<c00d8d74>] (dput+0x30/0x1e0)
[ 11.253479] [<c00d8d74>] (dput+0x30/0x1e0) from [<c012c800>] (nfs_lookup_revalidate+0x2e8/0x490)
[ 11.262573] [<c012c800>] (nfs_lookup_revalidate+0x2e8/0x490) from [<c00cf5cc>] (do_lookup+0x194/0x240)
[ 11.272216] [<c00cf5cc>] (do_lookup+0x194/0x240) from [<c00d19a4>] (do_last+0x194/0x734)
[ 11.280609] [<c00d19a4>] (do_last+0x194/0x734) from [<c00d2cdc>] (path_openat+0xc0/0x380)
[ 11.289062] [<c00d2cdc>] (path_openat+0xc0/0x380) from [<c00d307c>] (do_filp_open+0x30/0x7c)
[ 11.297821] [<c00d307c>] (do_filp_open+0x30/0x7c) from [<c00c4204>] (do_sys_open+0xe0/0x17c)
[ 11.306549] [<c00c4204>] (do_sys_open+0xe0/0x17c) from [<c0033bc0>] (ret_fast_syscall+0x0/0x30)
objdump:
c00d8d44 <dput> (File Offset: 0xd8d44):
c00d8d44: e92d41f0 push {r4, r5, r6, r7, r8, lr}
c00d8d48: e2504000 subs r4, r0, #0 ; 0x0
c00d8d4c: 08bd81f0 popeq {r4, r5, r6, r7, r8, pc}
c00d8d50: e3cd6d7f bic r6, sp, #8128 ; 0x1fc0
c00d8d54: e59f81bc ldr r8, [pc, #444] ; c00d8f18 <dput+0x1d4> (File Offset: 0xd8f18)
c00d8d58: e59f71bc ldr r7, [pc, #444] ; c00d8f1c <dput+0x1d8> (File Offset: 0xd8f1c)
c00d8d5c: e3c6603f bic r6, r6, #63 ; 0x3f
c00d8d60: e3a00001 mov r0, #1 ; 0x1
c00d8d64: ebfde2a6 bl c0051804 <add_preempt_count> (File Offset: 0x51804)
c00d8d68: e594304c ldr r3, [r4, #76]
c00d8d6c: e3530000 cmp r3, #0 ; 0x0
c00d8d70: 1a000001 bne c00d8d7c <dput+0x38> (File Offset: 0xd8d7c)
c00d8d74: e5833000 str r3, [r3]
c00d8d78: eafffffd b c00d8d74 <dput+0x30> (File Offset: 0xd8d74)
c00d8d7c: e3530001 cmp r3, #1 ; 0x1
c00d8d80: 8a00002c bhi c00d8e38 <dput+0xf4> (File Offset: 0xd8e38)
c00d8d84: e5943000 ldr r3, [r4]
c00d8d88: e3130902 tst r3, #32768 ; 0x8000
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