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Re: [Qemu-devel] WG: [ovirt-users] Segmentation fault in libtcmalloc
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From: |
Dr. David Alan Gilbert |
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Subject: |
Re: [Qemu-devel] WG: [ovirt-users] Segmentation fault in libtcmalloc |
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Date: |
Thu, 10 Dec 2015 12:38:23 +0000 |
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User-agent: |
Mutt/1.5.24 (2015-08-30) |
* Grundmann, Christian (address@hidden) wrote:
> Hi,
>
> qemu-img-ev-2.3.0-29.1.el7.x86_64
> libvirt-daemon-driver-qemu-1.2.8-16.el7_1.4.x86_64
> qemu-kvm-ev-2.3.0-29.1.el7.x86_64
> qemu-kvm-common-ev-2.3.0-29.1.el7.x86_64
> ipxe-roms-qemu-20130517-7.gitc4bce43.el7.noarch
> qemu-kvm-tools-ev-2.3.0-29.1.el7.x86_64
>
>
> it seems pc-i440fx-rhel7.2.0 is the default for ovirt 3.6
>
> I tried using only virtio-scsi disk but the VM wont boot (not bootable
> device) so i used IDE for the boot disk.
I think this seg is actually quite different - although it depends where the
actual corruption
happened - looking at the backtrace again the failing thread wasn't the io
thread; it
failed in a call from the json parser in the main thread.
Dave
> a
> Thx Christian
>
> -----Ursprüngliche Nachricht-----
> Von: Dr. David Alan Gilbert [mailto:address@hidden
> Gesendet: Donnerstag, 03. Dezember 2015 10:04
> An: Grundmann, Christian <address@hidden>
> Cc: 'Paolo Bonzini' <address@hidden>; 'address@hidden' <address@hidden>;
> address@hidden
> Betreff: Re: AW: WG: [ovirt-users] Segmentation fault in libtcmalloc
>
> * Grundmann, Christian (address@hidden) wrote:
> > Hi again,
> > got a Segfault today without virtio :-( (one IDE Disk and one
> > virtio-scsi)
> >
> > Core was generated by `/usr/libexec/qemu-kvm -name vmname -S -machine
> > pc-i440fx-rhel7.2.0,accel='.
>
> Can you confirm the package version you were using; if you're running the
> pc-i440fx-rhel7.2.0 machine type it must be pretty new.
>
> Dave
>
> > Program terminated with signal 11, Segmentation fault.
> > #0 0x00007fb299cbd3ab in
> > tcmalloc::ThreadCache::ReleaseToCentralCache(tcmalloc::ThreadCache::Fr
> > eeList*, unsigned long, int) () from /lib64/libtcmalloc.so.4
<deleted>
It looks like it's the main thread in the json parser:
> > Thread 1 (Thread 0x7fb29e07cc00 (LWP 29076)):
> > #0 0x00007fb299cbd3ab in
> > tcmalloc::ThreadCache::ReleaseToCentralCache(tcmalloc::ThreadCache::FreeList*,
> > unsigned long, int) () from /lib64/libtcmalloc.so.4 No symbol table info
> > available.
> > #1 0x00007fb299cbd47b in
> > tcmalloc::ThreadCache::ListTooLong(tcmalloc::ThreadCache::FreeList*,
> > unsigned long) () from /lib64/libtcmalloc.so.4 No symbol table info
> > available.
> > #2 0x00007fb299ccc070 in tc_free () from /lib64/libtcmalloc.so.4 No
> > symbol table info available.
> > #3 0x00007fb29c58d58f in g_free () from /lib64/libglib-2.0.so.0 No
> > symbol table info available.
> > #4 0x00007fb29e3b7721 in parser_context_free (ctxt=0x7fb2a531e0c0) at
> > qobject/json-parser.c:358
> > i = <optimized out>
> > #5 json_parser_parse_err (tokens=<optimized out>, address@hidden,
> > address@hidden) at qobject/json-parser.c:710
> > result = 0x7fb2a4bdf600
> > #6 0x00007fb29e3b7767 in json_parser_parse (tokens=<optimized out>,
> > address@hidden) at qobject/json-parser.c:694 No locals.
> > #7 0x00007fb29e176e04 in handle_qmp_command (parser=<optimized out>,
> > tokens=<optimized out>) at /usr/src/debug/qemu-2.3.0/monitor.c:5068
> > err = <optimized out>
> > obj = <optimized out>
> > input = 0x0
> > args = 0x0
> > cmd_name = <optimized out>
> > mon = 0x7fb2a153e140
> > #8 0x00007fb29e3b64f2 in json_message_process_token (lexer=0x7fb2a1460040,
> > token=0x7fb2a1424880, type=JSON_OPERATOR, x=49, y=104) at
> > qobject/json-streamer.c:87
> > parser = 0x7fb2a1460038
> > dict = 0x7fb2a3e27200
> > #9 0x00007fb29e3c891f in json_lexer_feed_char (address@hidden,
> > ch=<optimized out>, address@hidden) at qobject/json-lexer.c:303
> > new_state = 100
> > #10 0x00007fb29e3c89ee in json_lexer_feed (lexer=0x7fb2a1460040,
> > buffer=<optimized out>, size=<optimized out>) at qobject/json-lexer.c:356
> > err = <optimized out>
> > i = <optimized out>
> > #11 0x00007fb29e3b6689 in json_message_parser_feed (parser=<optimized
> > out>, buffer=<optimized out>, size=<optimized out>) at
> > qobject/json-streamer.c:110 No locals.
> > #12 0x00007fb29e1758cf in monitor_control_read (opaque=<optimized out>,
> > buf=<optimized out>, size=<optimized out>) at
> > /usr/src/debug/qemu-2.3.0/monitor.c:5134
> > old_mon = 0x0
> > #13 0x00007fb29e2321b0 in qemu_chr_be_write (len=<optimized out>,
> > buf=0x7fff7bea8a30 "}\212\352{\377\177", s=0x7fb2a14442e0) at
> > qemu-char.c:305 No locals.
> > #14 tcp_chr_read (chan=<optimized out>, cond=<optimized out>,
> > opaque=0x7fb2a14442e0) at qemu-char.c:2870
> > chr = 0x7fb2a14442e0
> > s = 0x7fb2a14363f0
> > buf =
> > "}\212\352{\377\177\000\000\360`;\236\262\177\000\000\030\003\000\000\000\000\000\000\205N;\236\262\177\000\000\240LB\241\262\177\000\000\263E;\236\262\177\000\000\240LB\241\262\177",
> > '\000' <repeats 18 times>, "address@hidden"...
> > len = <optimized out>
> > size = <optimized out>
> > #15 0x00007fb29c58799a in g_main_context_dispatch () from
> > /lib64/libglib-2.0.so.0 No symbol table info available.
> > #16 0x00007fb29e34b288 in glib_pollfds_poll () at main-loop.c:209
> > context = 0x7fb2a1491140
> > pfds = <optimized out>
> > #17 os_host_main_loop_wait (timeout=<optimized out>) at main-loop.c:254
> > ret = 2
> > spin_counter = 0
> > #18 main_loop_wait (nonblocking=<optimized out>) at main-loop.c:503
> > ret = 2
> > timeout = 4294967295
> > timeout_ns = <optimized out>
> > #19 0x00007fb29e14aa4e in main_loop () at vl.c:1818
> > nonblocking = <optimized out>
> > last_io = 2
> > #20 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>)
> > at vl.c:4394
> > i = <optimized out>
> > snapshot = <optimized out>
> > linux_boot = <optimized out>
> > initrd_filename = <optimized out>
> > kernel_filename = <optimized out>
> > kernel_cmdline = <optimized out>
> > boot_order = 0x7fb29e3dda67 "cad"
> > boot_once = 0x0
> > cyls = <optimized out>
> > heads = <optimized out>
> > secs = <optimized out>
> > translation = <optimized out>
> > hda_opts = <optimized out>
> > opts = <optimized out>
> > machine_opts = <optimized out>
> > icount_opts = <optimized out>
> > olist = <optimized out>
> > optind = 78
> > optarg = 0x7fb2a14ef8c0 "pc-i440fx-rhel7.2.0"
> > loadvm = <optimized out>
> > machine_class = <optimized out>
> > cpu_model = <optimized out>
> > vga_model = 0x0
> > qtest_chrdev = <optimized out>
> > qtest_log = <optimized out>
> > pid_file = <optimized out>
> > incoming = <optimized out>
> > show_vnc_port = <optimized out>
> > defconfig = <optimized out>
> > userconfig = 111
> > log_mask = <optimized out>
> > log_file = <optimized out>
> > mem_trace = {malloc = 0x7fb29e238480 <malloc_and_trace>, realloc =
> > 0x7fb29e238460 <realloc_and_trace>, free = 0x7fb29e238450 <free_and_trace>,
> > calloc = 0x0, try_malloc = 0x0, try_realloc = 0x0}
> > trace_events = <optimized out>
> > trace_file = <optimized out>
> > maxram_size = <optimized out>
> > ram_slots = <optimized out>
> > vmstate_dump_file = <optimized out>
> > main_loop_err = 0x0
> > __func__ = "main"
> >
> >
> >
> >
> > -----Ursprüngliche Nachricht-----
> > Von: Paolo Bonzini [mailto:address@hidden Im Auftrag von
> > Paolo Bonzini
> > Gesendet: Donnerstag, 19. November 2015 18:02
> > An: Grundmann, Christian <address@hidden>; 'Dr.
> > David Alan Gilbert' <address@hidden>
> > Cc: 'address@hidden' <address@hidden>;
> > address@hidden
> > Betreff: Re: WG: [ovirt-users] Segmentation fault in libtcmalloc
> >
> >
> >
> > On 19/11/2015 17:00, Grundmann, Christian wrote:
> > > Hi, it seems that using virtio-scsi did the trick, But now the VMs
> > > are pausing without an coredump, so the underlying Problem (no
> > > storage
> > > Error) is not fixed, As I am using Snapshots (and so the disks have
> > > to grow very fast) I try if tuning "volume_utilization_percent" and
> > > "volume_utilization_chunk_mb" will help
> > > (https://access.redhat.com/solutions/130843)
> >
> > The fix for virtio-blk is probably this patch:
> > http://article.gmane.org/gmane.comp.emulators.qemu.block/6380/raw
> >
> > Paolo
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK