Hiya,
Trying to get cloud-init working on a fairly recent OSv (0.55) image
using an ISO to provide the YAML file. This used to work fine on my
previous OSv image, but now I'm hitting an assert failure:
Assertion failed: (uio->uio_resid % BSIZE) == 0 (fs/vfs/vfs_bdev.cc:
bdev_read: 33)
[backtrace]
0x000000004023acac <__assert_fail+28>
0x00000000404459e5 <bdev_read+261>
0x000000004044e62d <device_read+61>
0x000000004044babe <vfs_file::read(uio*, int)+94>
0x00000000404491ba <sys_read+234>
0x000000004043ef10 <???+1078193936>
0x0000000040464b4d <__stdio_read+61>
0x00000000404994cc <fread_unlocked+188>
0x00001000006a772a <???+6977322>
0x00001000006a7c0c <cdio_stream_read+107>
0x00001000006d9a50 <???+7182928>
0x00001000006d9a8a <iso9660_iso_seek_read+55>
0x00001000006d9011 <???+7180305>
0x00001000006d9077 <???+7180407>
0x00001000006d90cd <iso9660_ifs_read_superblock+83>
0x00001000006d8a03 <???+7178755>
0x00001000006d8b07 <???+7179015>
0x00001000006d8ad6 <???+7178966>
0x000010000068cc9f <???+6868127>
0x000010000068d347 <???+6869831>
0x00000000404377a0 <osv::application::run_main()+64>
0x0000000040223523 <osv::application::main()+147>
The iso hasn't changed and mounts fine on a loopback under linux.
Building a new iso gives the same error. GDB backtrace is as follows:
#0 0x0000000040399f32 in processor::cli_hlt () at
arch/x64/processor.hh:247
#1 arch::halt_no_interrupts () at arch/x64/arch.hh:48
#2 osv::halt () at arch/x64/power.cc:26
#3 0x000000004023ac82 in abort (fmt=fmt@entry=0x406535f0 "Assertion
failed: %s (%s: %s: %d)\n")
at runtime.cc:140
#4 0x000000004023acad in __assert_fail (expr=expr@entry=0x406a46d1
"(uio->uio_resid % BSIZE) == 0",
file=file@entry=0x406a46a6 "fs/vfs/vfs_bdev.cc",
line=line@entry=33,
func=func@entry=0x406a469c "bdev_read") at runtime.cc:147
#5 0x00000000404459e6 in bdev_read (dev=<optimised out>,
uio=0x2000012ff480, ioflags=<optimised out>)
at fs/vfs/vfs_bdev.cc:42
#6 0x000000004044e62e in device_read (dev=0xffffa00100a18080,
uio=0x2000012ff480, ioflags=0)
at fs/devfs/device.cc:387
#7 0x000000004044babf in vfs_file::read (this=0xffffa00101545900,
uio=0x2000012ff480, flags=<optimised out>)
at fs/vfs/vfs_fops.cc:54
#8 0x00000000404491bb in sys_read (fp=0xffffa00101545900,
iov=iov@entry=0x2000012ff530, niov=niov@entry=2,
offset=offset@entry=-1, count=count@entry=0x2000012ff4f8) at
fs/vfs/vfs_syscalls.cc:275
#9 0x000000004043ef11 in preadv (fd=<optimised out>,
iov=iov@entry=0x2000012ff530, iovcnt=iovcnt@entry=2,
offset=offset@entry=-1) at fs/vfs/main.cc:422
#10 0x000000004043ef80 in readv (fd=<optimised out>,
iov=iov@entry=0x2000012ff530, iovcnt=iovcnt@entry=2)
at fs/vfs/main.cc:436
#11 0x0000000040464b4e in __stdio_read (f=0xffff900101577000,
buf=<optimised out>, len=2048)
at libc/stdio/__stdio_read.c:28
#12 0x00000000404994cd in fread (destv=<optimised out>, size=1,
nmemb=2048, f=0xffff900101577000)
at musl/src/stdio/fread.c:26
#13 0x00001000006a772b in _stdio_read ()
#14 0x00001000006a7c0d in cdio_stream_read ()
#15 0x00001000006d9a51 in iso9660_seek_read_framesize ()
#16 0x00001000006d9a8b in iso9660_iso_seek_read ()
#17 0x00001000006d9012 in iso9660_ifs_read_pvd_loglevel ()
#18 0x00001000006d9078 in iso9660_ifs_read_pvd ()
#5 0x00000000404459e6 in bdev_read (dev=<optimised out>,
uio=0x2000012ff480, ioflags=<optimised out>)
at fs/vfs/vfs_bdev.cc:42
42 while (uio->uio_resid > 0) {
(gdb) p uio->uio_resid
$8 = 133112
(gdb) up
#6 0x000000004044e62e in device_read (dev=0xffffa00100a18080,
uio=0x2000012ff480, ioflags=0)
at fs/devfs/device.cc:387
387 error = (*ops->read)(dev, uio, ioflags);
(gdb) p dev->name
$9 = "vblk1\000\000\000\000\000\000"
It seem to be reading the correct block device:
virtio-blk: Add blk device instances 0 as vblk0, devsize=524288000
virtio-blk: Add blk device instances 1 as vblk1, devsize=378880
I see there was a similar assert that Justin hit a while back (#877). I
made the same change (replace fread with read and change the args) and
that no longer asserts, but doesn't read the ISO (as Justin found).
Any ideas?
Cheers
Rick
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