[AHCI] crash when running a GNU/Hurd guest

[Damien Zammit]

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)

[Samuel thibault (samuel-thibault)]

Note: this is using the rump ahci driver.

[Thomas Huth (th-huth)]

The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.

If the bug has already been fixed in the latest upstream version of QEMU,
then please close this ticket as "Fix released".

If it is not fixed yet and you think that this bug report here is still
valid, then you have two options:

1) If you already have an account on gitlab.com, please open a new ticket
for this problem in our new tracker here:

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

and then close this ticket here on Launchpad (or let it expire auto-
matically after 60 days). Please mention the URL of this bug ticket on
Launchpad in the new ticket on GitLab.

2) If you don't have an account on gitlab.com and don't intend to get
one, but still would like to keep this ticket opened, then please switch
the state back to "New" or "Confirmed" within the next 60 days (other-
wise it will get closed as "Expired"). We will then eventually migrate
the ticket automatically to the new system (but you won't be the reporter
of the bug in the new system and thus you won't get notified on changes
anymore).

Thank you and sorry for the inconvenience.

[Thomas Huth (th-huth)]

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