At Tue, 3 Apr 2007 21:05:06 +0400, Dmitry Baikov wrote: > > On 4/3/07, Takashi Iwai <tiwai@xxxxxxx> wrote: > > I guess you're looking at a different place. As you can find the > > place matching with "89" (marked in the middle) somewhere in > > clear_subscriber_list(). Check the byte matter matching with > > disassembler code. Also, you can get source code lines via -l option > > of objdump, which helps pretty much. > > Got it :) Kernel dumps the code around the faulty address, not from. > That's explains that "middle of instruction". > > I found why I never had this behaviour before: > I changed port creation code from snd_seq_create_simple_port to > create_port and incorrectly used return value (0) as a port number. > And I had port 0 before. > So, then I subscribed and later deleted this port several times. So this bug doesn't happen with the non-modified code, or does it? > As for objdump, -l option did not give anything (seems, I had stripped > debug info). > And now with debug alsa build, I cannot reproduce the bug. Oh yeah, it makes our lives harder ;) Takashi > old results of objdump: (Faulty address is 4ad9) > > 4aa0: e8 89 fd ff ff call 482e <unsubscribe_port> > 4aa5: 85 ff test %edi,%edi > 4aa7: 75 10 jne 4ab9 <clear_subscriber_list+0x80> > 4aa9: ff 4e 60 decl 0x60(%esi) > 4aac: 0f 94 c0 sete %al > 4aaf: 84 c0 test %al,%al > 4ab1: 0f 84 82 00 00 00 je 4b39 > <clear_subscriber_list+0x100> > 4ab7: eb 79 jmp 4b32 <clear_subscriber_list+0xf9> > 4ab9: 83 7c 24 30 00 cmpl $0x0,0x30(%esp) > 4abe: 75 2a jne 4aea <clear_subscriber_list+0xb1> > 4ac0: 8d af b4 00 00 00 lea 0xb4(%edi),%ebp > 4ac6: 8d 9f c4 00 00 00 lea 0xc4(%edi),%ebx > 4acc: 89 d8 mov %ebx,%eax > 4ace: e8 fc ff ff ff call 4acf <clear_subscriber_list+0x96> > 4ad3: 8d 4e 58 lea 0x58(%esi),%ecx > 4ad6: 8b 56 58 mov 0x58(%esi),%edx > 4ad9: 8b 41 04 mov 0x4(%ecx),%eax > 4adc: 89 42 04 mov %eax,0x4(%edx) > 4adf: 89 10 mov %edx,(%eax) > 4ae1: c7 46 58 00 01 10 00 movl $0x100100,0x58(%esi) > 4ae8: eb 22 jmp 4b0c <clear_subscriber_list+0xd3> > 4aea: 8d 6f 68 lea 0x68(%edi),%ebp > 4aed: 8d 5f 78 lea 0x78(%edi),%ebx > 4af0: 89 d8 mov %ebx,%eax > 4af2: e8 fc ff ff ff call 4af3 <clear_subscriber_list+0xba> > 4af7: 8d 4e 50 lea 0x50(%esi),%ecx > 4afa: 8b 56 50 mov 0x50(%esi),%edx > 4afd: 8b 41 04 mov 0x4(%ecx),%eax > 4b00: 89 42 04 mov %eax,0x4(%edx) > 4b03: 89 10 mov %edx,(%eax) > 4b05: c7 46 50 00 01 10 00 movl $0x100100,0x50(%esi) > 4b0c: c7 41 04 00 02 20 00 movl $0x200200,0x4(%ecx) > 4b13: 89 d8 mov %ebx,%eax > 4b15: e8 fc ff ff ff call 4b16 <clear_subscriber_list+0xdd> > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
