nbdkit logs to stderr when "--verbose" flag given even without "--foreground" flag #18
Comments
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FYI upstream issues are here: https://gitlab.com/nbdkit/nbdkit/-/issues The issue is that debug messages and error messages are handled separately. Debug messages are only generated when Error messages are generated for error conditions, and they go to stderr or the syslog depending on the So it's working as expected as far as I can see. I would suggest for the debug messages that you redirect fd 2 of the nbdkit process after forking. |
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OK - thanks for the explanation and sorry about targeting the wrong project! |
asomers
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Jan 13, 2023
VDDK 7.0.0 and 7.0.3 crash with GLIBC_TUNABLES (malloc debugging) and
latest glibc. This likely indicates a bug in VDDK, but as we cannot
fix it we need to disable the extra hygiene checks instead. For
information the stack trace is below.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 malloc_check_get_size (mem=0x0)
at /usr/src/debug/glibc-2.34.9000-13.fc36.x86_64/malloc/malloc-check.c:39
39 magic = (((uintptr_t) p >> 3) ^ ((uintptr_t) p >> 11)) & 0xFF;
[Current thread is 1 (Thread 0x7fea8056b640 (LWP 3905172))]
(gdb) bt
#0 malloc_check_get_size (mem=0x0)
at /usr/src/debug/glibc-2.34.9000-13.fc36.x86_64/malloc/malloc-check.c:39
libguestfs#1 malloc_usable_size (mem=0x0) at malloc-debug.c:405
libguestfs#2 0x00007fea7fd5199b in greedy_realloc0 (p=p@entry=0x7fea805690c0,
need=need@entry=2, size=size@entry=16) at ../src/basic/alloc-util.c:87
libguestfs#3 0x00007fea7fd51b13 in netlink_container_parse (m=m@entry=0x555d34e77f80,
container=0x555d34e77f90, rta=0x555d34e821f8, rt_len=<optimized out>)
at ../src/libsystemd/sd-netlink/netlink-message.c:1078
libguestfs#4 0x00007fea7fd557ec in sd_netlink_message_rewind (genl=<optimized out>,
m=<optimized out>) at ../src/libsystemd/sd-netlink/netlink-message.c:1324
libguestfs#5 socket_read_message (rtnl=<optimized out>)
at ../src/libsystemd/sd-netlink/netlink-socket.c:375
libguestfs#6 sd_netlink_read (usec=0, ret=0x7fea805692a0, serial=<optimized out>,
rtnl=<optimized out>) at ../src/libsystemd/sd-netlink/sd-netlink.c:700
libguestfs#7 sd_netlink_call (rtnl=<optimized out>, message=<optimized out>,
ret=0x7fea805692a0, usec=0)
at ../src/libsystemd/sd-netlink/sd-netlink.c:743
libguestfs#8 0x00007fea7fd5818e in local_addresses (af=2, ret=0x7fea80569378,
ifindex=0, context=0x0) at ../src/shared/local-addresses.c:90
libguestfs#9 0x00007fea7fd590b9 in _nss_myhostname_gethostbyname3_r (
name=<optimized out>, af=<optimized out>, host=0x7fea805695a0,
buffer=0x7fea80569750 "\177", buflen=1024, errnop=0x7fea8056b4b8,
h_errnop=0x7fea80569594, ttlp=0x0, canonp=0x0)
at ../src/nss-myhostname/nss-myhostname.c:373
libguestfs#10 0x00007fea7fd593cb in _nss_myhostname_gethostbyname_r (
name=0x7fea80569601 "pick", host=0x7fea805695a0,
buffer=0x7fea80569750 "\177", buflen=1024, errnop=0x7fea8056b4b8,
h_errnop=0x7fea80569594) at ../src/nss-myhostname/nss-myhostname.c:514
libguestfs#11 0x00007fea864491cb in __gethostbyname_r (
name=0x7fea80569601 "pick", resbuf=0x7fea805695a0,
buffer=<optimized out>, buflen=1024, result=<optimized out>,
h_errnop=0x7fea80569594) at ../nss/getXXbyYY_r.c:273
libguestfs#12 0x00007fea85bdcca4 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#13 0x00007fea85bd2bb2 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#14 0x00007fea85bba567 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#15 0x00007fea85bbab75 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#16 0x00007fea85bc63bd in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#17 0x00007fea85bc42ec in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#18 0x00007fea85bbf026 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#19 0x00007fea85bc0038 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#20 0x00007fea85c2fb23 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
libguestfs#21 0x00007fea85c2f160 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#22 0x00007fea85c2f1ba in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#23 0x00007fea85d0c0b9 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#24 0x00007fea85d079cb in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#25 0x00007fea85cb2831 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#26 0x00007fea85ca4702 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#27 0x00007fea85c9f76f in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#28 0x00007fea85c7b59f in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#29 0x00007fea85c7c11d in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#30 0x00007fea85bb4475 in ?? ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#31 0x00007fea85bb4717 in VixDiskLib_Open ()
from vddk-7.0.3/vmware-vix-disklib-distrib/lib64/libvixDiskLib.so.7
#32 0x00007fea867b0dbb in vddk_open (readonly=<optimized out>)
at /home/rjones/d/nbdkit/plugins/vddk/vddk.c:717
#33 0x0000555d2a83d922 in plugin_open (c=0x555d34e81d10, readonly=0,
exportname=<optimized out>, is_tls=<optimized out>)
at /home/rjones/d/nbdkit/server/plugins.c:353
#34 0x0000555d2a83572d in backend_open (b=0x555d34668db0, readonly=0,
exportname=0x555d34dae020 "", shared=0)
at /home/rjones/d/nbdkit/server/backend.c:292
#35 0x0000555d2a83b937 in protocol_common_open (
exportsize=exportsize@entry=0x7fea8056a9e0,
flags=flags@entry=0x555d34e7f604,
exportname=exportname@entry=0x555d34e7eeb0 "")
at /home/rjones/d/nbdkit/server/protocol-handshake.c:83
#36 0x0000555d2a83e140 in finish_newstyle_options (exportsize=0x7fea8056a9e0,
exportname_in=<optimized out>, exportnamelen=<optimized out>)
at /home/rjones/d/nbdkit/server/protocol-handshake-newstyle.c:284
#37 0x0000555d2a837ee0 in negotiate_handshake_newstyle_options ()
at /home/rjones/d/nbdkit/server/protocol-handshake-newstyle.c:572
#38 protocol_handshake_newstyle ()
at /home/rjones/d/nbdkit/server/protocol-handshake-newstyle.c:904
#39 protocol_handshake ()
at /home/rjones/d/nbdkit/server/protocol-handshake.c:55
#40 handle_single_connection (sockin=<optimized out>, sockout=<optimized out>)
at /home/rjones/d/nbdkit/server/connections.c:171
#41 0x0000555d2a83e4e0 in start_thread (datav=0x555d34d987d0)
at /home/rjones/d/nbdkit/server/sockets.c:354
#42 0x00007fea863b4677 in start_thread (arg=<optimized out>)
at pthread_create.c:434
#43 0x00007fea86439320 in clone3 ()
at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
mmuman
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this issue
Mar 4, 2024
mmuman
pushed a commit
to mmuman/nbdkit
that referenced
this issue
Mar 4, 2024
Fix the Rust peername unit tests on BE architectures Closes libguestfs#18 See merge request nbdkit/nbdkit!41
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Versions:
Not sure if I'm doing something wrong, but it seems like logging to stderr works too well, and logging to syslog completely does not work.
Problem 1: when the
--verboseflag is given tonbdkit(1), it logs to stderr (a) even though the--foregroundflag is not given. This happens even if the--log=syslogflag is given.Here's an example. When my program (s3backer) runs with the
--debugflag, itfork()'s offnbdkit(1)as shown in the log below with the--verboseflag. But thennbdkit(1)continues to log stuff to syslog even after it's forked into the background:My NBD plugin also ends up logging stuff to stderr (not shown) in this situation - presumably because it is logging via
nbdkit_vdebug()and that goes to the same place.Problem 2: When
nbdkit(1)is invoked without the--verboseflag, logging completely disappears. It should be going to syslog but never shows up in/var/log/messages(even with--log=syslog).Example:
What am I doing wrong? Thanks.
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