[Bug 1878915] Re: util/fdmon-io_uring.c:95: get_sqe: Assertion `ret > 1' failed.

[Thomas Huth]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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Title:
  util/fdmon-io_uring.c:95: get_sqe: Assertion `ret > 1' failed.

Status in QEMU:
  Fix Released

Bug description:
  qemu 5.0.0, liburing1 0.6-3, Linux 5.6.0-1-686-pae (Debian)

  Stack trace:

  Stack trace of thread 31002:
  #0  0x00000000b7faf1cd __kernel_vsyscall (linux-gate.so.1 + 0x11cd)
  #1  0x00000000b6c618e2 __libc_signal_restore_set (libc.so.6 + 0x348e2)
  #2  0x00000000b6c4a309 __GI_abort (libc.so.6 + 0x1d309)
  #3  0x00000000b6c4a1d1 __assert_fail_base (libc.so.6 + 0x1d1d1)
  #4  0x00000000b6c59929 __GI___assert_fail (libc.so.6 + 0x2c929)
  #5  0x0000000000ba80be get_sqe (qemu-system-i386 + 0x6d00be)
  #6  0x0000000000ba80cb add_poll_add_sqe (qemu-system-i386 + 0x6d00cb)
  #7  0x0000000000ba820c fill_sq_ring (qemu-system-i386 + 0x6d020c)
  #8  0x0000000000ba7145 aio_poll (qemu-system-i386 + 0x6cf145)
  #9  0x0000000000aede63 blk_prw (qemu-system-i386 + 0x615e63)
  #10 0x0000000000aeef95 blk_pread (qemu-system-i386 + 0x616f95)
  #11 0x00000000008abbfa fdctrl_transfer_handler (qemu-system-i386 + 0x3d3bfa)
  #12 0x0000000000906c3d i8257_channel_run (qemu-system-i386 + 0x42ec3d)
  #13 0x00000000008ac119 fdctrl_start_transfer (qemu-system-i386 + 0x3d4119)
  #14 0x00000000008ab233 fdctrl_write_data (qemu-system-i386 + 0x3d3233)
  #15 0x0000000000708ae7 memory_region_write_accessor (qemu-system-i386 + 
0x230ae7)
  #16 0x00000000007059e1 access_with_adjusted_size (qemu-system-i386 + 0x22d9e1)
  #17 0x000000000070b931 memory_region_dispatch_write (qemu-system-i386 + 
0x233931)
  #18 0x00000000006a87a2 address_space_stb (qemu-system-i386 + 0x1d07a2)
  #19 0x0000000000829216 helper_outb (qemu-system-i386 + 0x351216)
  #20 0x00000000b06d9fdc n/a (n/a + 0x0)

  Steps:

  0. qemu-img create -f raw fda.img 3840K
  1. mformat -i fda.img -n 48 -t 80 -h 2
  2. qemu-system-i386 -fda fda.img -hda freedos.qcow2
  3. Attempt to run 'dosfsck a:' in the guest

  According to hw/block/fdc.c, a 3840K image should result in a virtual
  floppy with a geometry of 48 sectors/track x 80 tracks x 2 sides.

  The assert seems bogus either way.

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