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https://bugs.launchpad.net/bugs/1955717
Title:
BUG: unsupported FP instruction in kernel mode FPEXC == 0x40000700 at
the end of a btrfs balance to RAID1
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hello there,
on my Raspberry Pi 4 I needed to convert a volume to RAID1, so I added
a disk and launched btrfs balance:
#> sudo btrfs balance start -dconvert=raid1 -mconvert=raid1
/mnt/mountpoint
The volume was 5 Tb worth of data, and after a couple of days the
process looked terminated correctly, in "sudo btrfs filesystem show"
everything looked ok:
Label: 'mountpoint' uuid: 15d2c29b-dc20-48a9-910d-e1af8948ed08
Total devices 2 FS bytes used 4.38TiB
devid 1 size 5.45TiB used 5.16TiB path /dev/mapper/dev-sdb1
devid 2 size 8.65TiB used 5.16TiB path /dev/mapper/dev-sda3
The total size is less than the single devices size because during the
process I managed to free up 1 Tb of data. Anyway, I looked at the
screen containing the balance command and it actually terminated with
a segfault, and dmesg was reporting this:
[ven dic 24 13:04:06 2021] BTRFS info (device dm-5): relocating block group
2177892352 flags data
[ven dic 24 13:04:43 2021] BTRFS info (device dm-5): found 462 extents,
stage: move data extents
[ven dic 24 13:04:44 2021] BTRFS info (device dm-5): found 462 extents,
stage: update data pointers
[ven dic 24 13:04:44 2021] BTRFS info (device dm-5): relocating block group
1104150528 flags data
[ven dic 24 13:05:22 2021] BTRFS info (device dm-5): found 2625 extents,
stage: move data extents
[ven dic 24 13:05:23 2021] BTRFS info (device dm-5): found 2625 extents,
stage: update data pointers
[ven dic 24 13:05:24 2021] BTRFS info (device dm-5): relocating block group
30408704 flags metadata|dup
[ven dic 24 13:05:56 2021] BTRFS info (device dm-5): found 2412 extents,
stage: move data extents
[ven dic 24 13:06:00 2021] BTRFS info (device dm-5): relocating block group
22020096 flags system|dup
[ven dic 24 13:06:01 2021] BTRFS info (device dm-5): balance: ended with
status: 0
[ven dic 24 13:06:01 2021] BUG: unsupported FP instruction in kernel mode
[ven dic 24 13:06:01 2021] FPEXC == 0x40000700
[ven dic 24 13:06:01 2021] Internal error: Oops - undefined instruction: 0
[#1] SMP ARM
[ven dic 24 13:06:01 2021] Modules linked in: rpcsec_gss_krb5 veth cdc_acm
aes_arm_bs crypto_simd cryptd dm_crypt dm_mod fuse xt_nat xt_tcpudp
xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xt_addrtype
iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
br_netfilter bridge stp llc overlay sg sch_fq_codel nfsd ip_tables x_tables
ipv6 btrfs blake2b_generic zstd_compress raid10 raid456 async_raid6_recov
async_memcpy async_pq async_xor async_tx xor xor_neon raid6_pq raid1 raid0
linear md_mod hid_logitech_hidpp joydev hid_logitech_dj brcmfmac brcmutil vc4
sha256_generic v3d cec gpu_sched drm_kms_helper cfg80211 bcm2835_codec(C)
raspberrypi_hwmon rfkill bcm2835_v4l2(C) bcm2835_isp(C) bcm2835_mmal_vchiq(C)
v4l2_mem2mem videobuf2_vmalloc videobuf2_dma_contig videobuf2_memops drm
videobuf2_v4l2 videobuf2_common vc_sm_cma(C) videodev snd_bcm2835(C) mc
drm_panel_orientation_quirks snd_soc_core rpivid_mem snd_compress
snd_pcm_dmaengine snd_pcm snd_timer snd syscopyarea sysfillrect
[ven dic 24 13:06:01 2021] sysimgblt fb_sys_fops backlight uio_pdrv_genirq
nvmem_rmem uio [last unloaded: cdc_acm]
[ven dic 24 13:06:01 2021] CPU: 3 PID: 9141 Comm: btrfs Tainted: G C
5.10.63-v7l+ #1459
[ven dic 24 13:06:01 2021] Hardware name: BCM2711
[ven dic 24 13:06:01 2021] PC is at vfp_reload_hw+0x30/0x44
[ven dic 24 13:06:01 2021] LR is at __und_usr_fault_32+0x0/0x8
[ven dic 24 13:06:01 2021] pc : [<c0203834>] lr : [<c0200fc0>] psr:
a0070013
[ven dic 24 13:06:01 2021] sp : ca0adfb0 ip : ca0adf30 fp : 00000003
[ven dic 24 13:06:01 2021] r10: ca0ac1f8 r9 : c0201024 r8 : c1205048
[ven dic 24 13:06:01 2021] r7 : 00000001 r6 : 00000000 r5 : c0288068 r4 :
c88f60f8
[ven dic 24 13:06:01 2021] r3 : c135607c r2 : b6cfeb8c r1 : ae24b2ce r0 :
f421070d
[ven dic 24 13:06:01 2021] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA
ARM Segment user
[ven dic 24 13:06:01 2021] Control: 30c5383d Table: 0335dd80 DAC: 55555555
[ven dic 24 13:06:01 2021] Process btrfs (pid: 9141, stack limit = 0x7d756e7e)
[ven dic 24 13:06:01 2021] Stack: (0xca0adfb0 to 0xca0ae000)
[ven dic 24 13:06:01 2021] dfa0: 00ad81d2
00491e87 00000008 0000002c
[ven dic 24 13:06:01 2021] dfc0: 00000008 b6d95d28 00491e8f 00000000 00000000
00491e87 b6cef66d b6d95e4c
[ven dic 24 13:06:01 2021] dfe0: 00ad81d2 be903718 b6cfa6d5 b6cfeb8c 80070010
ffffffff 00000000 00000000
[ven dic 24 13:06:01 2021] Backtrace: invalid frame pointer 0x00000003
[ven dic 24 13:06:01 2021] Code: 128aa080 e89a0162 e3110102 0a000003
(eee96a10)
[ven dic 24 13:06:01 2021] ---[ end trace b013d23166ad7965 ]---
I'm running Ubuntu 20.04 32 bit with kernel 5.10.63-v7l+ and btrfs-
progs/btrfs-tools at these versions:
ii btrfs-progs 5.4.1-2 armhf Checksumming Copy on Write
Filesystem utilities
ii btrfs-tools 4.15.1-1build1 armhf transitional dummy package
btrfsck terminated correctly without errors, so I think everything is
"normal" after all. I'll just leave this bug here for posterity (or I
will update the thread if something goes horribly wrong in the
immediate future).
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