Re: [Xenomai-core] [2.6.22-BUG] inconsistent Linux IRQ mask

[Jan Kiszka <jan.kiszka@domain.hid>]

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Jan Kiszka wrote:
> Hi Philippe,
> 
> this appears to be related to 2.6.22+ only:
> 
>  ------------[ cut here ]------------
>  kernel BUG at fs/buffer.c:1230!
>  invalid opcode: 0000 [#1]
>  PREEMPT
>  Modules linked in: xeno_rtdm xeno_nucleus ip6t_LOG xt_TCPMSS nvram uinput snd_pcm_oss cifs snd_mixer_oss snd_seq snd_seq_device radeon drm wlan_tkip af_packet thinkpad_acpi button battery ac ip6t_REJECT xt_state iptable_nat nf_nat ip6table_mangle nf_conntrack_ipv4 nf_conntrack nfnetlink ip6table_filter ip6_tables ipv6 nls_iso8859_1 nls_cp437 vfat fat nls_utf8 ntfs dm_mod fuse wlan_scan_sta ath_rate_sample pcmcia snd_intel8x0 firmware_class snd_ac97_codec ac97_bus snd_pcm ath_pci nsc_ircc wlan ide_cd irda snd_timer e100 cdrom ath_hal(P) snd i2c_i801 uhci_hcd ehci_hcd mii yenta_socket rsrc_nonstatic soundcore usbcore snd_page_alloc i2c_core intel_agp crc_ccitt pcmcia_core agpgart parport_pc lp parport reiserfs edd fan piix ide_disk ide_core
>  CPU:    0
>  EIP:    0060:[<c0187fc3>]    Tainted: P       VLI
>  EFLAGS: 00210246   (2.6.22.2-adeos #7)
>  EIP is at __find_get_block+0x2c/0x1e8
>  eax: 00000000   ebx: e3635dac   ecx: 00000000   edx: 00002e4e
>  esi: 00001000   edi: eeeb3080   ebp: e3635b30   esp: e3635af8
>  ds: 007b   es: 007b   fs: 0000  gs: 0033  ss: 0068
>  Process kio_file (pid: 7433, ti=e3634000 task=e6d780b0 task.ti=e3634000)<0>
>  I-pipe domain Linux
>  Stack: 00002e4e 00000000 c16e0718 eff36a90 e3634000 e3635b1c c0308f1e c05dd700
>         00000000 e3635b2c c030bbfd e3635dac 00001000 e3635db4 e3635b98 c01881a4
>         00001000 c05dd700 511c5a51 00000022 c014aade 00002e4e 00000000 eeeb3080
>  Call Trace:
>   [<c0104fd0>] show_trace_log_lvl+0x1f/0x34
>   [<c0105085>] show_stack_log_lvl+0xa0/0xa8
>   [<c0105294>] show_registers+0x207/0x35c
>   [<c01054fd>] die+0x114/0x22a
>   [<c01056a1>] do_trap+0x8e/0xa7
>   [<c0105a2f>] do_invalid_op+0x8d/0x97
>   [<c0113b1a>] __ipipe_handle_exception+0xb1/0x11f
>   [<c030be53>] error_code+0x6f/0x7c
>   [<c01881a4>] __getblk+0x25/0x29a
>   [<f0bdc058>] search_by_key+0x97/0xe38 [reiserfs]
>   [<f0bc6c10>] search_by_entry_key+0x20/0x231 [reiserfs]
>   [<f0bc6e96>] reiserfs_find_entry+0x75/0x2d0 [reiserfs]
>   [<f0bc7643>] reiserfs_lookup+0x6d/0x122 [reiserfs]
> ...
> 
> I get this over 2.6.22.2 with latest trunk + ipipe-1.9-03, only
> modprobe'ing xeno_rtdm (so that the nucleus becomes active) and then
> logging into KDE. Same box, same Xenomai, but 2.6.20.15: no problem at
> all (also xeno-text runs fine here, BTW). When Xenomai is inactive,
> 2.6.22 makes no problems as well. Note that the tracer is compiled in,
> but is deactivated. Activating it (with the hope to get a panic
> backtrace) makes the issue disappear as well.

Ah, and then there was this warning once (same kernel that reliably BUGs):

WARNING: at kernel/softirq.c:138 local_bh_enable()
 [<c0104fd0>] show_trace_log_lvl+0x1f/0x34
 [<c0105c62>] show_trace+0x17/0x19
 [<c0105cfc>] dump_stack+0x1a/0x1c
 [<c011f38a>] local_bh_enable+0x53/0xb3
 [<c028b6d5>] lock_sock_nested+0xbe/0xc6
 [<c0288feb>] sock_fasync+0x68/0x125
 [<c028a0f3>] sock_close+0x2a/0x38
 [<c016bc1a>] __fput+0xb9/0x195
 [<c016bd11>] fput+0x1b/0x1d
 [<c0169572>] filp_close+0x59/0x61
 [<c016a5cd>] sys_close+0x73/0xab
 [<c0103f05>] sysenter_past_esp+0x6e/0x72

Probably a different symptom of the same bug.

Jan


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