Re: WARNING: at fs/buffer.c:1250 mark_buffer_dirty+0x7c/0x90()

[Jeff Mahoney <jeffm@suse.com>]

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Tomasz Chmielewski wrote:
> I've seen this warning on 2.6.29-rc3 when I removed a iSCSI device without
> unmounting a filesystem on it:

You can ignore this warning. There's a long-standing issue where it will
print warnings after the superblock has failed to be written out. When
that happens, the regular endio handler marks it !uptodate. The warning
occurs when another attempt is made to write it out since it's not
marked uptodate again. The superblock is special in that it is read once
at mount, and then write-only afterwards, so the concept of !uptodate
doesn't really apply.

I posted a patch to work around this some time ago, but it's only a
temporary fix. I suspect that nobody's tackled this because the handling
is in jbd and the superblock is a special case.

- -Jeff

> Aborting journal on device
> sdb.                                                                                                
> ------------[ cut here
> ]------------                                                                                           
> WARNING: at fs/buffer.c:1250
> mark_buffer_dirty+0x7c/0x90()                                                                     
> Hardware name: SCENIC
> EDITION                                                                                                  
> Modules linked in: ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core
> ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ext3 jbd
> tun kvm crc32c af_packet 8021q garp stp ipv6 binfmt_misc loop dm_mod
> cpufreq_ondemand cpufreq_conservative cpufreq_powersave p4_clockmod
> speedstep_lib usbhid freq_table fuse usb_storage snd_intel8x0
> snd_ac97_codec ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event
> snd_seq snd_seq_device snd_pcm_oss snd_pcm ppdev snd_timer snd_mixer_oss
> snd tulip soundcore snd_page_alloc ehci_hcd shpchp sis_agp ohci_hcd
> pci_hotplug sr_mod agpgart sg parport_pc parport rtc_cmos container
> thermal button processor evdev usbcore ide_generic ata_generic
> ide_pci_generic pata_acpi sis5513 ide_gd_mod ide_core pata_sis libata
> sd_mod scsi_mod crc_t10dif ext4 jbd2 crc16 [last unloaded:
> scsi_transport_iscsi]                                                                                                           
> Pid: 2726, comm: kjournald Not tainted 2.6.29-0.rc3.1mdv
> #1                                                                                                
> Call
> Trace:                                                                                                                                                
> [<c038a02d>] ?
> printk+0x18/0x1b                                                                                                                           
> [<c0133213>]
> warn_slowpath+0x73/0xd0                                                                                                                      
> [<c0177953>] ?
> find_get_page+0x23/0xb0                                                                                                                    
> [<c0133a69>] ?
> release_console_sem+0x1c9/0x200                                                                                                            
> [<c01c619c>]
> mark_buffer_dirty+0x7c/0x90                                                                                                                  
> [<f85e746d>] journal_update_superblock+0x6d/0xd0
> [jbd]                                                                                                    
> [<f85e7626>] __journal_abort_soft+0x86/0xa0
> [jbd]                                                                                                         
> [<f85e6e6e>] ? __journal_remove_journal_head+0x9e/0x120
> [jbd]                                                                                             
> [<f85e7648>] journal_abort+0x8/0x10
> [jbd]                                                                                                                 
> [<f85e4dfd>] journal_commit_transaction+0xd8d/0xf50
> [jbd]                                                                                                 
> [<c038a5de>] ?
> schedule+0x3de/0x9d0                                                                                                                       
> [<c013d91a>] ?
> try_to_del_timer_sync+0x4a/0x60                                                                                                            
> [<f85e7e7d>] kjournald+0xad/0x1e0
> [jbd]                                                                                                                   
> [<c0148160>] ?
> autoremove_wake_function+0x0/0x50                                                                                                          
> [<f85e7dd0>] ? kjournald+0x0/0x1e0
> [jbd]                                                                                                                  
> [<c0147dec>]
> kthread+0x3c/0x70                                                                                                                            
> [<c0147db0>] ?
> kthread+0x0/0x70                                                                                                                           
> [<c0104867>]
> kernel_thread_helper+0x7/0x10                                                                                                                
> ---[ end trace 66edd8e45842a174
> ]---                                                                                                                       
> journal commit I/O
> error                                                                                                                                   
> sd 6:0:0:1: [sdb] Synchronizing SCSI cache  
> 
> 


- --
Jeff Mahoney
SUSE Labs
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