I'm just improving ql-fstest[1] a bit and while testing the code I
pressed ctrl-c. I'm not entirely sure, but rather likely that was the
reason why the file system went into read-only.
This is with 3.7.0:
[429066.090309] WARNING: at fs/btrfs/super.c:246 __btrfs_abort_transaction+0xd7/0xf0 [btrfs]()
[429066.090310] Hardware name: ESPRIMO P900
[429066.090311] btrfs: Transaction aborted
[429066.090312] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs reiserfs ext3 jbd ext2 msr cpufreq_stats fuse xt_state iptable_filter ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables cachefiles nfsv3 rfcomm parport_pc ppdev lp parport bnep bluetooth rfkill binfmt_misc bridge stp llc tun nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc dm_crypt xfs snd_hda_codec_conexant snd_hda_intel tpm_infineon snd_hda_codec snd_hwdep dm_multipath snd_pcm_oss snd_mixer_oss scsi_dh snd_pcm gpio_ich tpm_tis tpm tpm_bios processor ext4 mbcache mei kvm_intel jbd2 lpc_ich kvm snd_seq_midi snd_rawmidi snd_seq_midi_event joydev snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc evdev microcode sch5636 serio_raw sch56xx_common coretemp crc16 btrfs zlib_deflate libcrc32c raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid1 raid0 multipath linear md_mod hid_microsoft hid_ge
neric usbhid hid dm_mod sr_mod sd_mod cdrom crc_t10dif i915 drm_kms_helper drm i2c_algo_bit i2c_core video thermal_sys crc32c_intel xhci_hcd ghash_clmulni_intel e1000e ahci libahci ehci_hcd usbcore aesni_intel ablk_helper cryptd lrw usb_common libata aes_x86_64 xts gf128mul scsi_mod button
[429066.090364] Pid: 511117, comm: btrfs-transacti Tainted: G W 3.7.0 #1
[429066.090365] Call Trace:
[429066.090370] [<ffffffff81051aca>] warn_slowpath_common+0x7a/0xb0
[429066.090374] [<ffffffff81051ba1>] warn_slowpath_fmt+0x41/0x50
[429066.090381] [<ffffffffa03381f5>] ? btrfs_free_path+0x25/0x30 [btrfs]
[429066.090386] [<ffffffffa0334e77>] __btrfs_abort_transaction+0xd7/0xf0 [btrfs]
[429066.090394] [<ffffffffa035433b>] btrfs_save_ino_cache+0x2db/0x3d0 [btrfs]
[429066.090401] [<ffffffffa035c89c>] commit_fs_roots.isra.24+0xbc/0x190 [btrfs]
[429066.090409] [<ffffffffa03abb86>] ? btrfs_scrub_pause+0xf6/0x110 [btrfs]
[429066.090416] [<ffffffffa035d718>] btrfs_commit_transaction+0x598/0xae0 [btrfs]
[429066.090418] [<ffffffff81074ba0>] ? finish_wait+0x80/0x80
[429066.090425] [<ffffffffa03563fd>] transaction_kthread+0x19d/0x220 [btrfs]
[429066.090432] [<ffffffffa0356260>] ? btree_readpage_end_io_hook+0x2a0/0x2a0 [btrfs]
[429066.090434] [<ffffffff810742bb>] kthread+0xbb/0xc0
[429066.090436] [<ffffffff81074200>] ? kthread_create_on_node+0x120/0x120
[429066.090438] [<ffffffff8148e7bc>] ret_from_fork+0x7c/0xb0
[429066.090440] [<ffffffff81074200>] ? kthread_create_on_node+0x120/0x120
[429066.090441] ---[ end trace 25cd8df3232ee3d8 ]---
[429066.090443] BTRFS error (device dm-5) in btrfs_save_ino_cache:470: error 28
[429066.090444] btrfs is forced readonly
[429066.191480] ------------[ cut here ]------------
[429066.191516] WARNING: at fs/btrfs/transaction.c:41 put_transaction+0x128/0x130 [btrfs]()
[429066.191517] Hardware name: ESPRIMO P900
[429066.191518] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs reiserfs ext3 jbd ext2 msr cpufreq_stats fuse xt_state iptable_filter ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables cachefiles nfsv3 rfcomm parport_pc ppdev lp parport bnep bluetooth rfkill binfmt_misc bridge stp llc tun nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc dm_crypt xfs snd_hda_codec_conexant snd_hda_intel tpm_infineon snd_hda_codec snd_hwdep dm_multipath snd_pcm_oss snd_mixer_oss scsi_dh snd_pcm gpio_ich tpm_tis tpm tpm_bios processor ext4 mbcache mei kvm_intel jbd2 lpc_ich kvm snd_seq_midi snd_rawmidi snd_seq_midi_event joydev snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc evdev microcode sch5636 serio_raw sch56xx_common coretemp crc16 btrfs zlib_deflate libcrc32c raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid1 raid0 multipath linear md_mod hid_microsoft hid_ge
neric usbhid hid dm_mod sr_mod sd_mod cdrom crc_t10dif i915 drm_kms_helper drm i2c_algo_bit i2c_core video thermal_sys crc32c_intel xhci_hcd ghash_clmulni_intel e1000e ahci libahci ehci_hcd usbcore aesni_intel ablk_helper cryptd lrw usb_common libata aes_x86_64 xts gf128mul scsi_mod button
[429066.191570] Pid: 511117, comm: btrfs-transacti Tainted: G W 3.7.0 #1
[429066.191571] Call Trace:
[429066.191576] [<ffffffff81051aca>] warn_slowpath_common+0x7a/0xb0
[429066.191578] [<ffffffff81051b15>] warn_slowpath_null+0x15/0x20
[429066.191585] [<ffffffffa035ca98>] put_transaction+0x128/0x130 [btrfs]
[429066.191592] [<ffffffffa035db8a>] btrfs_commit_transaction+0xa0a/0xae0 [btrfs]
[429066.191595] [<ffffffff81074ba0>] ? finish_wait+0x80/0x80
[429066.191602] [<ffffffffa03563fd>] transaction_kthread+0x19d/0x220 [btrfs]
[429066.191608] [<ffffffffa0356260>] ? btree_readpage_end_io_hook+0x2a0/0x2a0 [btrfs]
[429066.191610] [<ffffffff810742bb>] kthread+0xbb/0xc0
[429066.191612] [<ffffffff81074200>] ? kthread_create_on_node+0x120/0x120
[429066.191615] [<ffffffff8148e7bc>] ret_from_fork+0x7c/0xb0
[429066.191616] [<ffffffff81074200>] ? kthread_create_on_node+0x120/0x120
[429066.191618] ---[ end trace 25cd8df3232ee3d9 ]---
[1] https://bitbucket.org/aakef/ql-fstest
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