kernel oops issue, does anyone has ideas?

[zhangleo]

Hi all,

请问那位仁兄遇到过linux kernel代码段被改写的问题？
由于目前还不支持KGDB，所以我打算把代码段属性设置为只读，但不知道如何处理？
郁闷了几天了J

BTW: IXP4XX系列架构

谢谢

<4>Internal error: Oops - undefined instruction: 0 [#1]
<4>Modules linked in
<4>CPU: 0
<4>PC is at tcp_recvmsg+0x498/0x7f8
<4>LR is at 0x18
<4>pc : [<c01cf300>] lr : [<00000018>] Tainted: P
<4>sp : c9f25dc4 ip : 0000002f fp : c9f25e10
<4>r10: 00000001 r9 : 00000000 r8 : 00000000
<4>r7 : a803f10e r6 : 00000001 r5 : cdce2f00 r4 : ca696060
<4>r3 : 0000002f r2 : 00000000 r1 : c028d070 r0 : c028a488
<4>Flags: nZCv IRQs on FIQs on Mode SVC_32 Segment user
<4>Control: 39FF
<4>Table: 09D3C000 DAC: 00000015
<4>Process sshd (pid: 1722, stack limit = 0xc9f24258)
<4>Stack: (0xc9f25dc4 to 0xc9f26000)
<4>5dc0: c9f25e60 00000000 ca6963a4 00000001 00000000 c9f24000 7fffffff
<4>5de0: 000005b4 00000000 c02bdb34 c9f25e60 c9f25eb4 c9e61620 00000001 00000001
<4>5e00: c9f25f38 c9f25e38 c9f25e14 c0198de0 c01cee74 00000000 00000000 c9f25e20
<4>5e20: 00000000 c022d5e0 c9f25e60 c9f25ea8 c9f25e3c c0196bcc c0198da0 00000000
<4>5e40: c0196ad4 c01eb2f8 00000000 00000001 c9e61620 00000013 00000000 c9f25e60
<4>5e60: 00000000 00000000 c9f25f38 00000001 00000000 00000000 00000000 c9f25eb4
<4>5e80: c9f25eb4 cba25340 c9f25f80 00000001 c0020d84 c9f24000 befffd48 c9f25f58
<4>5ea0: c9f25eb0 c007dccc c0196aec 00000000 00000000 cccfe240 028dc004 00000000
<4>5ec0: 00000001 ffffffff cba25340 00000000 00000000 00000000 00000000 c9f5c0c0
<4>5ee0: 00000000 00000000 c00529a8 c9f5c0c0 c00502e0 c9f25ef4 c9f25ef4 00000000
<4>5f00: 00000000 00000000 c9f25e40 c9f5c0c0 c9f25f64 c9f25f20 00000001 c0052c10
<4>5f20: c9f25f68 00000000 00000000 c9e6173c 00000002 ca1583d4 befffd48 00000001
<4>5f40: cba25340 befffd48 c9f25f80 c9f25f7c c9f25f5c c007e63c c007dc18 00000000
<4>5f60: cba25340 00000000 00000000 00000003 c9f25fa4 c9f25f80 c007ea6c c007e57c
<4>5f80: 00000000 00000000 00000000 befffd48 00000000 00000001 00000000 c9f25fa8
<4>5fa0: c0020be0 c007ea2c befffd48 00000000 00000005 befffd48 00000001 00000001
<4>5fc0: befffd48 00000000 00000001 00000005 0000be68 000666a8 befffd48 000666c0
<4>5fe0: 00000000 befff6f0 000406d0 402a4f34 60000010 00000005 00000000 00000000
<4>Backtrace:
<4>[<c01cee68>] (tcp_recvmsg+0x0/0x7f8) from [<c0198de0>] (sock_common_recvmsg+0x4c/0x60)
<4>[<c0198d94>] (sock_common_recvmsg+0x0/0x60) from [<c0196bcc>] (sock_aio_read+0xf0/0xf8)
<4> r5 = C9F25E60 r4 = C022D5E0
<4>[<c0196ae0>] (sock_aio_read+0x4/0xf8) from [<c007dccc>] (do_sync_read+0xc0/0x114)
<4>[<c007dc0c>] (do_sync_read+0x0/0x114) from [<c007e63c>] (vfs_read+0xcc/0x140)
<4> r6 = C9F25F80 r5 = BEFFFD48 r4 = CBA25340
<4>[<c007e570>] (vfs_read+0x0/0x140) from [<c007ea6c>] (sys_read+0x4c/0x80)
<4> r7 = 00000003 r6 = 00000000 r5 = 00000000 r4 = CBA25340
<4>[<c007ea20>] (sys_read+0x0/0x80) from [<c0020be0>] (ret_fast_syscall+0x0/0x2c)
<4> r6 = 00000001 r5 = 00000000 r4 = BEFFFD48
<4>Code: ffffffe1 ffffffe3 fffffbff ffffffff (fffff001)




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[Barry Song]

你拿仿真器在gdb设置一个WATCH，一旦有人践踏了你说的被改的代码段位置，停住backtrace观察。应该是内核里面哪里的内存溢出造成。

2010/1/15 zhangleo <zol...@hotmail.com>:

[zhangleo]

Thanks for reply. actually this is a very old issue, i found the reason finally, redboot using DMA to transmitted data and this lead to memory overwrited.