Hello, I put the "WARN_ON(1);" after the printk lines (incomplete page read and incomplete page write) in extent_io.c. here some call traces: [ 19.509497] incomplete page read in btrfs with offset 2560 and length 1536 [ 19.509500] ------------[ cut here ]------------ [ 19.509528] WARNING: CPU: 2 PID: 220 at fs/btrfs/extent_io.c:2441 end_bio_extent_readpage+0x788/0xc20 [btrfs]() [ 19.509530] Modules linked in: cdc_acm fuse iTCO_wdt iTCO_vendor_support snd_hda_codec_analog coretemp kvm_intel kvm raid1 ext4 crc16 md_mod mbcache jbd2 microcode nvidia(PO) psmouse pcspkr evdev serio_raw i2c_i801 lpc_ich i2c_core snd_hda_intel sky2 skge i82975x_edac button asus_atk0110 snd_hda_codec snd_hwdep shpchp snd_pcm snd_page_alloc snd_timer acpi_cpufreq snd edac_core soundcore processor vboxdrv(O) sr_mod cdrom ata_generic pata_acpi hid_generic usbhid hid usb_storage sd_mod pata_marvell firewire_ohci uhci_hcd ahci ehci_pci firewire_core ata_piix libahci crc_itu_t ehci_hcd libata scsi_mod usbcore usb_common btrfs crc32c libcrc32c xor raid6_pq bcache [ 19.509578] CPU: 2 PID: 220 Comm: btrfs-endio-met Tainted: P W O 3.12.5-1-ARCH #1 [ 19.509580] Hardware name: System manufacturer System Product Name/P5WDG2 WS Pro, BIOS 0905 03/06/2008 [ 19.509581] 0000000000000009 ffff880231a63cb0 ffffffff814ee37b 0000000000000000 [ 19.509585] ffff880231a63ce8 ffffffff81062bcd ffffea00085eaec0 0000000000000000 [ 19.509587] ffff8802320cc9c0 0000000000000000 ffff880233b0e000 ffff880231a63cf8 [ 19.509590] Call Trace: [ 19.509596] [<ffffffff814ee37b>] dump_stack+0x54/0x8d [ 19.509601] [<ffffffff81062bcd>] warn_slowpath_common+0x7d/0xa0 [ 19.509603] [<ffffffff81062caa>] warn_slowpath_null+0x1a/0x20 [ 19.509614] [<ffffffffa00b7ba8>] end_bio_extent_readpage+0x788/0xc20 [btrfs] [ 19.509617] [<ffffffff8107010b>] ? lock_timer_base.isra.35+0x2b/0x50 [ 19.509619] [<ffffffff8106f660>] ? detach_if_pending+0x120/0x120 [ 19.509623] [<ffffffff811d98dd>] bio_endio+0x1d/0x30 [ 19.509632] [<ffffffffa0090227>] end_workqueue_fn+0x37/0x40 [btrfs] [ 19.509642] [<ffffffffa00c6b1e>] worker_loop+0x14e/0x560 [btrfs] [ 19.509646] [<ffffffff810952b2>] ? default_wake_function+0x12/0x20 [ 19.509656] [<ffffffffa00c69d0>] ? btrfs_queue_worker+0x330/0x330 [btrfs] [ 19.509672] [<ffffffff81084fe0>] kthread+0xc0/0xd0 [ 19.509677] [<ffffffff81084f20>] ? kthread_create_on_node+0x120/0x120 [ 19.509680] [<ffffffff814fce7c>] ret_from_fork+0x7c/0xb0 [ 19.509683] [<ffffffff81084f20>] ? kthread_create_on_node+0x120/0x120 [ 19.509687] ---[ end trace bbc8d0d088375446 ]--- [ 25.592100] incomplete page read in btrfs with offset 2560 and length 1536 [ 25.592105] ------------[ cut here ]------------ [ 25.592141] WARNING: CPU: 0 PID: 442 at fs/btrfs/extent_io.c:2441 end_bio_extent_readpage+0x788/0xc20 [btrfs]() [ 25.592143] Modules linked in: cdc_acm fuse iTCO_wdt iTCO_vendor_support snd_hda_codec_analog coretemp kvm_intel kvm raid1 ext4 crc16 md_mod mbcache jbd2 microcode nvidia(PO) psmouse pcspkr evdev serio_raw i2c_i801 lpc_ich i2c_core snd_hda_intel sky2 skge i82975x_edac button asus_atk0110 snd_hda_codec snd_hwdep shpchp snd_pcm snd_page_alloc snd_timer acpi_cpufreq snd edac_core soundcore processor vboxdrv(O) sr_mod cdrom ata_generic pata_acpi hid_generic usbhid hid usb_storage sd_mod pata_marvell firewire_ohci uhci_hcd ahci ehci_pci firewire_core ata_piix libahci crc_itu_t ehci_hcd libata scsi_mod usbcore usb_common btrfs crc32c libcrc32c xor raid6_pq bcache [ 25.592205] CPU: 0 PID: 442 Comm: btrfs-endio-met Tainted: P W O 3.12.5-1-ARCH #1 [ 25.592208] Hardware name: System manufacturer System Product Name/P5WDG2 WS Pro, BIOS 0905 03/06/2008 [ 25.592211] 0000000000000009 ffff880229773cb0 ffffffff814ee37b 0000000000000000 [ 25.592216] ffff880229773ce8 ffffffff81062bcd ffffea0002a20a80 0000000000000000 [ 25.592220] ffff88022d3ab180 0000000000000000 ffff88022d326000 ffff880229773cf8 [ 25.592225] Call Trace: [ 25.592234] [<ffffffff814ee37b>] dump_stack+0x54/0x8d [ 25.592240] [<ffffffff81062bcd>] warn_slowpath_common+0x7d/0xa0 [ 25.592245] [<ffffffff81062caa>] warn_slowpath_null+0x1a/0x20 [ 25.592262] [<ffffffffa00b7ba8>] end_bio_extent_readpage+0x788/0xc20 [btrfs] [ 25.592267] [<ffffffff810701ef>] ? try_to_del_timer_sync+0x4f/0x70 [ 25.592271] [<ffffffff81070262>] ? del_timer_sync+0x52/0x60 [ 25.592275] [<ffffffff8106f660>] ? detach_if_pending+0x120/0x120 [ 25.592280] [<ffffffff811d98dd>] bio_endio+0x1d/0x30 [ 25.592296] [<ffffffffa0090227>] end_workqueue_fn+0x37/0x40 [btrfs] [ 25.592312] [<ffffffffa00c6b1e>] worker_loop+0x14e/0x560 [btrfs] [ 25.592318] [<ffffffff810952b2>] ? default_wake_function+0x12/0x20 [ 25.592335] [<ffffffffa00c69d0>] ? btrfs_queue_worker+0x330/0x330 [btrfs] [ 25.592350] [<ffffffff81084fe0>] kthread+0xc0/0xd0 [ 25.592353] [<ffffffff81084f20>] ? kthread_create_on_node+0x120/0x120 [ 25.592356] [<ffffffff814fce7c>] ret_from_fork+0x7c/0xb0 [ 25.592359] [<ffffffff81084f20>] ? kthread_create_on_node+0x120/0x120 [ 25.592360] ---[ end trace bbc8d0d088375447 ]--- thanks, Fabio Pfeifer 2013/12/19 Chris Mason <clm@xxxxxx>: > On Wed, 2013-12-18 at 18:17 +0100, eb wrote: >> I've recently setup a system (Kernel 3.12.5-1-ARCH) which is layered as follows: >> >> /dev/sdb3 - cache0 (80 GB Intel SSD) >> /dev/sdc1 - backing device (2 TB WD HDD) >> >> sdb3+sdc1 => /dev/bcache0 >> >> On /dev/bcache0, there's a btrfs filesystem with 2 subvolumes, mounted >> as / and /home. What's been bothering me are the following entries in >> my kernel log: >> >> [13811.845540] incomplete page write in btrfs with offset 1536 and length 2560 >> [13870.326639] incomplete page write in btrfs with offset 3072 and length 1024 >> >> The offset/length values are always either 1536/2560 or 3072/1024, >> they sum up nicely to 4K. There are 607 of those in there as I am >> writing this, the machine has been up 18 hours and been under no >> particular I/O strain (it's a desktop). > > Btrfs shouldn't be setting the offset on the bios. Are you able to add > a WARN_ON to the message that prints this so we can see the stack trace? > > Could you please cc the bcache and btrfs list together? > > -chris > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
