After merging btrfs-next patches (chris' btrfs-3.0 branch) I get following error:
[ 9799.199495] ------------[ cut here ]------------ [ 9799.199511] kernel BUG at fs/btrfs/super.c:984! [ 9799.199524] invalid opcode: 0000 [#1] PREEMPT SMP [ 9799.199539] CPU 1 [ 9799.199542] Modules linked in: cpufreq_stats btrfs zlib_deflate libcrc32c microcode reiserfs arc4 snd_hda_codec_conexant uvcvideo cdc_ether usbnet videodev v4l2_compat_ioctl32 cdc_acm cdc_wdm btusb snd_hda_intel iwlagn bluetooth mac80211 snd_hda_codec snd_hwdep snd_pcm cfg80211 snd_timer snd soundcore snd_page_alloc e1000e thinkpad_acpi hwmon rfkill nvram zcache(PC) zram(C) rtc_cmos tp_smapi thinkpad_ec psmouse fscache kvm_intel kvm loop configs ipv6 autofs4 uhci_hcd firewire_ohci sdhci_pci firewire_core sr_mod ehci_hcd sdhci mmc_core crc_itu_t cdrom sd_mod usbcore [ 9799.199657] [ 9799.199669] Pid: 2263, comm: df Tainted: P C 3.0.4-ck1+ #1 LENOVO 2242CTO/2242CTO [ 9799.199686] RIP: 0010:[<ffffffffa032b682>] [<ffffffffa032b682>] btrfs_statfs+0x108/0x3a9 [btrfs] [ 9799.199716] RSP: 0018:ffff8800414f9de8 EFLAGS: 00010246 [ 9799.199728] RAX: ffff880129bf8000 RBX: ffff8800414f9f00 RCX: ffff880129bfa30c [ 9799.199742] RDX: ffff880129c8e240 RSI: 000000009123683e RDI: 0000000000000000 [ 9799.199756] RBP: ffff880129bf8000 R08: ffffffff810d1ad0 R09: 0000000000000203 [ 9799.199769] R10: ffff88012254eab0 R11: 0000000000000203 R12: ffff88011ba433c0 [ 9799.199783] R13: 0000000000000000 R14: 0000000000885fa0 R15: ffff880129bfa368 [ 9799.199797] FS: 00007f15983f7700(0000) GS:ffff88013bc80000(0000) knlGS:0000000000000000 [ 9799.199811] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 9799.199824] CR2: 00000000015fa008 CR3: 000000008e5d5000 CR4: 00000000000406e0 [ 9799.199838] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 9799.199851] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 9799.199865] Process df (pid: 2263, threadinfo ffff8800414f8000, task ffff8800b8426780) [ 9799.199878] Stack: [ 9799.199889] ffff8800414f9ed8 ffffffff810d1ad0 ffff88013162e4f8 ffffffff00000000 [ 9799.199906] ffff880129f3c900 ffff88012cdf3800 ffff880129bf8000 0000000c430fe005 [ 9799.199923] 0000000000000000 ffff880132b0f540 ffff88011badc958 ffff880129bfa3c0 [ 9799.199940] Call Trace: [ 9799.199955] [<ffffffff810d1ad0>] ? user_path_at+0x55/0x7b [ 9799.199971] [<ffffffff810e5f2c>] ? statfs_by_dentry+0x46/0x5d [ 9799.199985] [<ffffffff810e5f56>] ? vfs_statfs+0x13/0x8b [ 9799.199999] [<ffffffff810d1ad0>] ? user_path_at+0x55/0x7b [ 9799.200006] [<ffffffff810e5ffe>] ? user_statfs+0x30/0x48 [ 9799.200006] [<ffffffff810e6068>] ? sys_statfs+0x12/0x2b [ 9799.200006] [<ffffffff8136607b>] ? system_call_fastpath+0x16/0x1b [ 9799.200006] Code: 18 48 89 33 4c 89 6b 20 48 89 43 08 48 8b 44 24 28 48 8b 80 20 01 00 00 48 8b 90 b8 23 00 00 48 89 44 24 30 8b 7a 30 85 ff 75 02 <0f> 0b 48 63 ff be 50 00 00 00 48 89 54 24 20 48 c1 e7 05 e8 56 [ 9799.200006] RIP [<ffffffffa032b682>] btrfs_statfs+0x108/0x3a9 [btrfs] [ 9799.200006] RSP <ffff8800414f9de8> [ 9799.221655] ---[ end trace 327e64ade405e154 ]--- PS. It might happened that it was caused by parition mounted read-only on read-only block device.
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