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[Qemu-devel] [Bug 1728660] Re: qemu-io segfaults at block/io.c:2545


From: Max Reitz
Subject: [Qemu-devel] [Bug 1728660] Re: qemu-io segfaults at block/io.c:2545
Date: Thu, 02 Nov 2017 21:15:27 -0000

Hi,

And once again, thanks a lot for reporting this bug!  Here, too, I've
found a fix and I'll send a patch once I've written a test case.

Max

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https://bugs.launchpad.net/bugs/1728660

Title:
  qemu-io segfaults at block/io.c:2545

Status in QEMU:
  New

Bug description:
  git is at HEAD a93ece47fd9edbd4558db24300056c9a57d3bcd4
  This is on ppc64le architecture.

  Re-production steps:

  1. Copy the attached file named test.img to a directory
  2. And customize the following command to point to the above directory and 
run the same.
  # mv test.img copy.img
  # qemu-io <path to>/copy.img -c "discard 108544 97792"

  from gdb:
  Program terminated with signal 11, Segmentation fault.
  #0  0x00000000100af254 in bdrv_co_pdiscard (bs=0x3ee89ad0, offset=196608, 
bytes=9728) at block/io.c:2545
  2545          if (bs->drv->bdrv_co_pdiscard) {
  Missing separate debuginfos, use: debuginfo-install 
cyrus-sasl-lib-2.1.26-21.el7.ppc64le glib2-2.50.3-3.el7.ppc64le 
glibc-2.17-196.el7.ppc64le gmp-6.0.0-15.el7.ppc64le gnutls-3.3.26-9.el7.ppc64le 
keyutils-libs-1.5.8-3.el7.ppc64le krb5-libs-1.15.1-8.el7.ppc64le 
libaio-0.3.109-13.el7.ppc64le libcom_err-1.42.9-10.el7.ppc64le 
libcurl-7.29.0-42.el7.ppc64le libffi-3.0.13-18.el7.ppc64le 
libgcc-4.8.5-16.el7_4.1.ppc64le libidn-1.28-4.el7.ppc64le 
libselinux-2.5-11.el7.ppc64le libssh2-1.4.3-10.el7_2.1.ppc64le 
libstdc++-4.8.5-16.el7_4.1.ppc64le libtasn1-4.10-1.el7.ppc64le 
nettle-2.7.1-8.el7.ppc64le nspr-4.13.1-1.0.el7_3.ppc64le 
nss-3.28.4-15.el7_4.ppc64le nss-softokn-freebl-3.28.3-8.el7_4.ppc64le 
nss-util-3.28.4-3.el7.ppc64le openldap-2.4.44-5.el7.ppc64le 
openssl-libs-1.0.2k-8.el7.ppc64le p11-kit-0.23.5-3.el7.ppc64le 
pcre-8.32-17.el7.ppc64le zlib-1.2.7-17.el7.ppc64le
  (gdb) bt
  #0  0x00000000100af254 in bdrv_co_pdiscard (bs=0x3ee89ad0, offset=196608, 
bytes=9728) at block/io.c:2545
  #1  0x000000001008f260 in blk_co_pdiscard (blk=0x3ee79410, offset=108544, 
bytes=97792) at block/block-backend.c:1447
  #2  0x0000000010090884 in blk_pdiscard_entry (opaque=0x3fffd7402c58) at 
block/block-backend.c:1851
  #3  0x00000000101aa444 in coroutine_trampoline (i0=1055521728, i1=0) at 
util/coroutine-ucontext.c:79
  #4  0x00003fff7a3d2b9c in makecontext () from /lib64/libc.so.6
  #5  0x0000000000000000 in ?? ()
  (gdb) bt full
  #0  0x00000000100af254 in bdrv_co_pdiscard (bs=0x3ee89ad0, offset=196608, 
bytes=9728) at block/io.c:2545
          num = 9728
          req = {bs = 0x3ee89ad0, offset = 108544, bytes = 97792, type = 
BDRV_TRACKED_DISCARD, serialising = false, overlap_offset = 108544,
            overlap_bytes = 97792, list = {le_next = 0x0, le_prev = 
0x3ee8cd48}, co = 0x3ee9fbc0, wait_queue = {entries = {sqh_first = 0x0,
                sqh_last = 0x3fff7823fe10}}, waiting_for = 0x0}
          max_pdiscard = 2147467264
          ret = 0
          head = 0
          tail = 9728
          align = 16384
          __PRETTY_FUNCTION__ = "bdrv_co_pdiscard"
  #1  0x000000001008f260 in blk_co_pdiscard (blk=0x3ee79410, offset=108544, 
bytes=97792) at block/block-backend.c:1447
          ret = 0
  #2  0x0000000010090884 in blk_pdiscard_entry (opaque=0x3fffd7402c58) at 
block/block-backend.c:1851
          rwco = 0x3fffd7402c58
  #3  0x00000000101aa444 in coroutine_trampoline (i0=1055521728, i1=0) at 
util/coroutine-ucontext.c:79
          arg = {p = 0x3ee9fbc0, i = {1055521728, 0}}
          self = 0x3ee9fbc0
          co = 0x3ee9fbc0
  #4  0x00003fff7a3d2b9c in makecontext () from /lib64/libc.so.6
  No symbol table info available.
  #5  0x0000000000000000 in ?? ()
  No symbol table info available.

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