[Bug 1917442] Re: [AHCI] crash when running a GNU/Hurd guest

[Thomas Huth <1917442@bugs.launchpad.net>]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/437


** Changed in: qemu
       Status: Incomplete => Expired

** Changed in: qemu
     Assignee: John Snow (jnsnow) => (unassigned)

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #437
   https://gitlab.com/qemu-project/qemu/-/issues/437

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https://bugs.launchpad.net/bugs/1917442

Title:
  [AHCI] crash when running a GNU/Hurd guest

Status in QEMU:
  Expired

Bug description:
  QEMU git hash = 51db2d7cf2

  Running guest OS using:

  $ gdb --args /extra/qemu/bin/qemu-system-i386 -M q35,accel=kvm -m 4096
  -net user,hostfwd=tcp::8888-:22 -net nic -drive
  id=udisk,file=/dev/sdd,format=raw,if=none -device ide-
  drive,drive=udisk,bootindex=1 -curses

  ...

  root@zamhurd:~# .ahcisata0 channel 5: setting WDCTL_RST failed for
  drive 0

  
  Thread 1 "qemu-system-i38" received signal SIGSEGV, Segmentation fault.
                                                                         [Switching to Thread 0x7ffff4f7bf00 (LWP 590666)]
  ahci_commit_buf (dma=0x555557335870, tx_bytes=2048) at ../hw/ide/ahci.c:1462
  1462        tx_bytes += le32_to_cpu(ad->cur_cmd->status);
  (gdb) bt full
  #0  ahci_commit_buf (dma=0x555557335870, tx_bytes=2048)
      at ../hw/ide/ahci.c:1462
          ad = 0x555557335870
  #1  0x0000555555893171 in dma_buf_commit (s=0x555557335930, tx_bytes=2048)
      at ../hw/ide/core.c:805
  #2  0x00005555558934f8 in ide_dma_cb (opaque=0x555557335930, ret=0)
      at ../hw/ide/core.c:887
          s = 0x555557335930
          n = 4
          sector_num = 4491160
          offset = 140732794753312
          stay_active = false
          prep_size = 0
          __PRETTY_FUNCTION__ = "ide_dma_cb"
  #3  0x0000555555830720 in dma_complete (dbs=0x7ffee83d5120, ret=0)
      at ../softmmu/dma-helpers.c:121
          __PRETTY_FUNCTION__ = "dma_complete"
  #4  0x00005555558307cd in dma_blk_cb (opaque=0x7ffee83d5120, ret=0)
      at ../softmmu/dma-helpers.c:139
          dbs = 0x7ffee83d5120
          cur_addr = 140732794753408
          cur_len = 93825013280880
          mem = 0x7ffeeccfef00
          __PRETTY_FUNCTION__ = "dma_blk_cb"
  #5  0x0000555555d92bce in blk_aio_complete (acb=0x7ffee847bbe0)
      at ../block/block-backend.c:1412
  #6  0x0000555555d92df0 in blk_aio_read_entry (opaque=0x7ffee847bbe0)
      at ../block/block-backend.c:1466
          acb = 0x7ffee847bbe0
          rwco = 0x7ffee847bc08
          qiov = 0x7ffee83d5180
          __PRETTY_FUNCTION__ = "blk_aio_read_entry"
  #7  0x0000555555e85580 in coroutine_trampoline (i0=-398117056, i1=32766)
      at ../util/coroutine-ucontext.c:173
          arg = {p = 0x7ffee8453740, i = {-398117056, 32766}}
          self = 0x7ffee8453740
          co = 0x7ffee8453740
          fake_stack_save = 0x0
  #8  0x00007ffff6544020 in __start_context () at /lib64/libc.so.6
  #9  0x00007ffeefdfd680 in  ()
  #10 0x0000000000000000 in  ()
  (gdb)
  (gdb) l
  1457	 */
  1458	static void ahci_commit_buf(const IDEDMA *dma, uint32_t tx_bytes)
  1459	{
  1460	    AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
  1461	
  1462	    tx_bytes += le32_to_cpu(ad->cur_cmd->status);
  1463	    ad->cur_cmd->status = cpu_to_le32(tx_bytes);
  1464	}
  1465	
  1466	static int ahci_dma_rw_buf(const IDEDMA *dma, bool is_write)
  (gdb) p ad
  $1 = (AHCIDevice *) 0x555557335870
  (gdb) p ad->cur_cmd
  $2 = (AHCICmdHdr *) 0x0
  (gdb)

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