Bug#787473: systemd: Segfault while adding a new job

Tino zottsoft at gmx.net
Wed Jul 1 14:58:04 BST 2015


The next SEGV. Looks like this time it crashed while rotating the log. I
was not around. I also found a zombie killall, but i couldn't find a
hint where it was comming from. Maybe the logrotate script?
-------------- next part --------------
Jul 01 06:34:28 Storage-Blue systemd[1]: Got message type=signal sender=org.freedesktop.DBus destination=n/a object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameOwnerChanged cookie=23 reply_cookie=0 error=n/a
Jul 01 06:34:28 Storage-Blue systemd[1]: Got message type=signal sender=org.freedesktop.DBus destination=n/a object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameOwnerChanged cookie=24 reply_cookie=0 error=n/a
Jul 01 06:34:56 Storage-Blue systemd[1]: Accepted new private connection.
Jul 01 06:34:56 Storage-Blue systemd[1]: Got notification message for unit systemd-journald.service
Jul 01 06:34:56 Storage-Blue systemd[1]: systemd-journald.service: Got notification message from PID 220 (WATCHDOG=1...)
Jul 01 06:34:56 Storage-Blue systemd[1]: systemd-journald.service: got WATCHDOG=1
Jul 01 06:34:56 Storage-Blue systemd[1]: Got notification message for unit systemd-journald.service
Jul 01 06:34:56 Storage-Blue systemd[1]: systemd-journald.service: Got notification message from PID 220 (WATCHDOG=1...)
Jul 01 06:34:56 Storage-Blue systemd[1]: systemd-journald.service: got WATCHDOG=1
Jul 01 06:34:56 Storage-Blue systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/rsyslog_2eservice interface=org.freedesktop.DBus.Properties member=GetAll cookie=1 reply_cookie=0 error=n/a
Jul 01 06:34:56 Storage-Blue systemd[1]: Caught <SEGV>, dumped core as pid 2934.
Jul 01 06:34:56 Storage-Blue systemd[1]: Freezing execution.


$ ls -la /core
-rw------- 1 root root 1888256 Jul  1 06:34 /core


$ sudo gdb /lib/systemd/systemd /core
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
[...]
[New LWP 2934]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabi/libthread_db.so.1".
Core was generated by `/sbin/init'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0xb6db9198 in raise (sig=11) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
37      ../nptl/sysdeps/unix/sysv/linux/pt-raise.c: No such file or directory.
(gdb) bt
#0  0xb6db9198 in raise (sig=11) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
#1  0xb6e188f0 in crash.lto_priv.245 (sig=11) at ../src/core/main.c:158
#2  <signal handler called>
#3  hashmap_iterate (h=h at entry=0xb810c82c, i=i at entry=0xbef6c200, key=key at entry=0x0) at ../src/shared/hashmap.c:704
#4  0xb6e774b4 in set_iterate (s=s at entry=0xb810c82c, i=i at entry=0xbef6c200) at ../src/shared/set.c:91
#5  0xb6e820dc in property_get_dependencies.lto_priv.799 (bus=<optimized out>, path=<optimized out>, interface=<optimized out>, property=<optimized out>, reply=0xb81689e8,
    userdata=0xb80fd37c, error=0xbef6c30c) at ../src/core/dbus-unit.c:108
#6  0xb6e8bde4 in invoke_property_get (bus=bus at entry=0xb8173888, slot=slot at entry=0xb8152b30, v=v at entry=0xb6f28720 <bus_unit_vtable+256>,
    path=path at entry=0xb816d080 "/org/freedesktop/systemd1/unit/rsyslog_2eservice", interface=0xb8152b70 "org.freedesktop.systemd1.Unit", property=0xb6ef7a1c "Wants",
    reply=reply at entry=0xb81689e8, userdata=0xb80fd37c, error=0xbef6c30c, error at entry=0xb6f28720 <bus_unit_vtable+256>) at ../src/libsystemd/sd-bus/bus-objects.c:447
#7  0xb6e8c19c in vtable_append_one_property (bus=bus at entry=0xb8173888, reply=reply at entry=0xb81689e8, path=path at entry=0xb816d080 "/org/freedesktop/systemd1/unit/rsyslog_2eservice",
    c=c at entry=0xb8152b48, v=v at entry=0xb6f28720 <bus_unit_vtable+256>, userdata=userdata at entry=0xb80fd350, error=error at entry=0xbef6c30c) at ../src/libsystemd/sd-bus/bus-objects.c:702
#8  0xb6e8c39c in vtable_append_all_properties (bus=bus at entry=0xb8173888, reply=0xb81689e8, path=0xb816d080 "/org/freedesktop/systemd1/unit/rsyslog_2eservice",
    c=c at entry=0xb8152b48, userdata=0xb80fd350, error=error at entry=0xbef6c30c) at ../src/libsystemd/sd-bus/bus-objects.c:745
#9  0xb6e908c8 in property_get_all_callbacks_run (found_object=0xbef6c40c, iface=0x0, require_fallback=true, first=<optimized out>, m=0xb8168800, bus=0xb8173888)
    at ../src/libsystemd/sd-bus/bus-objects.c:806
#10 object_find_and_run.lto_priv.263 (bus=bus at entry=0xb8173888, m=m at entry=0xb8168800, p=0x1 <error: Cannot access memory at address 0x1>,
    p at entry=0xbef6c398 "/org/freedesktop/systemd1/unit", require_fallback=require_fallback at entry=true, found_object=found_object at entry=0xbef6c40c)
    at ../src/libsystemd/sd-bus/bus-objects.c:1314
#11 0xb6e4b350 in bus_process_object (m=0xb8168800, bus=0xb8173888) at ../src/libsystemd/sd-bus/bus-objects.c:1392
#12 process_message (m=0xb8168800, bus=0xb8173888) at ../src/libsystemd/sd-bus/sd-bus.c:2394
#13 process_running (hint_priority=false, priority=0, ret=0x0, bus=0xb8173888) at ../src/libsystemd/sd-bus/sd-bus.c:2436
#14 bus_process_internal.constprop.176 (bus=0xb8173888, ret=0x0, priority=0, hint_priority=false) at ../src/libsystemd/sd-bus/sd-bus.c:2619
#15 0xb6e3a640 in sd_bus_process (ret=0x0, bus=<optimized out>) at ../src/libsystemd/sd-bus/sd-bus.c:2638
#16 io_callback (s=<optimized out>, fd=<optimized out>, revents=<optimized out>, userdata=<optimized out>) at ../src/libsystemd/sd-bus/sd-bus.c:2897
#17 0xb6e26d10 in source_dispatch (s=0xb8157cb0) at ../src/libsystemd/sd-event/sd-event.c:2016
#18 0xb6e2c400 in sd_event_run (e=0xb80c3f50, timeout=<optimized out>) at ../src/libsystemd/sd-event/sd-event.c:2314
#19 0xb6e15394 in manager_loop (m=0xb80c3c08) at ../src/core/manager.c:2009
#20 main (argc=1, argv=0xbef6ce84) at ../src/core/main.c:1743


$ ps faux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         2  0.0  0.0      0     0 ?        S    Jun30   0:00 [kthreadd]
root         3  0.0  0.0      0     0 ?        S    Jun30   0:09  \_ [ksoftirqd/0]
root         5  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kworker/0:0H]
root         7  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [watchdog/0]
root         8  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [khelper]
root         9  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [kdevtmpfs]
root        10  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [netns]
root        11  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [khungtaskd]
root        12  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [writeback]
root        13  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [crypto]
root        14  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kintegrityd]
root        15  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root        16  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kblockd]
root        18  0.0  0.0      0     0 ?        S    Jun30   0:05  \_ [kswapd0]
root        19  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [fsnotify_mark]
root        25  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kthrotld]
root        26  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [spi0]
root        27  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [deferwq]
root        64  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [ata_sff]
root        65  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [scsi_eh_0]
root        66  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [scsi_tmf_0]
root        67  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [scsi_eh_1]
root        68  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [scsi_tmf_1]
root        69  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [scsi_eh_2]
root        70  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [scsi_tmf_2]
root        71  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [scsi_eh_3]
root        72  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [scsi_tmf_3]
root        73  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [scsi_eh_4]
root        75  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [scsi_tmf_4]
root        77  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [scsi_eh_5]
root        79  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [scsi_tmf_5]
root        88  0.0  0.0      0     0 ?        S<   Jun30   0:45  \_ [kworker/0:1H]
root        95  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [md]
root       100  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       101  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       132  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       150  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-worker]
root       151  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kworker/u3:0]
root       152  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-worker-hi]
root       153  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-delalloc]
root       154  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-flush_del]
root       155  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-cache]
root       156  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-submit]
root       157  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-fixup]
root       158  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio]
root       159  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio-met]
root       160  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio-met]
root       161  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio-rai]
root       162  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-rmw]
root       163  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio-wri]
root       164  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-freespace]
root       165  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-delayed-m]
root       166  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-readahead]
root       167  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-qgroup-re]
root       168  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-extent-re]
root       169  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [btrfs-cleaner]
root       170  0.0  0.0      0     0 ?        S    Jun30   0:13  \_ [btrfs-transacti]
root       190  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [ipv6_addrconf]
root       211  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [kauditd]
root       289  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [khubd]
root       290  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [mv_crypto]
root       637  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kdmflush]
root       638  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kdmflush]
root       644  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kdmflush]
root       682  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       683  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       684  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd_io]
root       685  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd_io]
root       686  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       688  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd]
root       689  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd]
root       690  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd_io]
root       691  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       692  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       693  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd]
root       694  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       704  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kdmflush]
root       705  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       706  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd_io]
root       707  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd]
root       708  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root       840  0.0  0.0      0     0 ?        S<   Jun30   0:32  \_ [kworker/u3:1]
root       934  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [rpciod]
root       936  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [nfsiod]
root      1073  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kdmflush]
root      1074  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root      1075  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd_io]
root      1076  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd]
root      1077  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root      1086  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kdmflush]
root      1087  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root      1088  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd_io]
root      1089  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [kcryptd]
root      1090  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [bioset]
root      1102  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-worker]
root      1103  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-worker-hi]
root      1104  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-delalloc]
root      1105  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-flush_del]
root      1106  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-cache]
root      1107  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-submit]
root      1108  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-fixup]
root      1109  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio]
root      1110  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio-met]
root      1111  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio-met]
root      1112  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio-rai]
root      1113  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-rmw]
root      1114  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-endio-wri]
root      1115  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-freespace]
root      1116  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-delayed-m]
root      1117  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-readahead]
root      1118  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-qgroup-re]
root      1119  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [btrfs-extent-re]
root      1120  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [btrfs-cleaner]
root      1121  0.1  0.0      0     0 ?        S    Jun30   2:33  \_ [btrfs-transacti]
root      1154  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [nfsd4]
root      1155  0.0  0.0      0     0 ?        S<   Jun30   0:00  \_ [nfsd4_callbacks]
root      1156  0.0  0.0      0     0 ?        S    Jun30   0:00  \_ [lockd]
root      1159  0.0  0.0      0     0 ?        S    Jun30   1:32  \_ [nfsd]
root      3349  0.2  0.0      0     0 ?        S    10:17   0:51  \_ [kworker/0:3]
root      3364  0.2  0.0      0     0 ?        S    10:29   0:40  \_ [kworker/0:1]
root      3466  0.2  0.0      0     0 ?        S    11:47   0:35  \_ [kworker/0:2]
root      3634  0.0  0.0      0     0 ?        S    13:55   0:00  \_ [kworker/u2:0]
root      3734  0.0  0.0      0     0 ?        S    15:12   0:00  \_ [kworker/u2:4]
root      3743  0.0  0.0      0     0 ?        S    15:20   0:00  \_ [kworker/u2:1]
root      3748  0.0  0.0      0     0 ?        S    15:22   0:00  \_ [kworker/u2:2]
root      3761  0.3  0.0      0     0 ?        S    15:27   0:03  \_ [kworker/0:4]
root      3769  0.5  0.0      0     0 ?        S    15:32   0:02  \_ [kworker/0:5]
root      3771  0.0  0.0      0     0 ?        S    15:33   0:00  \_ [kworker/u2:5]
root      3772  0.0  0.0      0     0 ?        S    15:33   0:00  \_ [kworker/u2:6]
root      3773  0.0  0.0      0     0 ?        S    15:33   0:00  \_ [kworker/u2:7]
root         1  0.0  0.3   5668  2024 ?        Ss   Jun30   0:03 /sbin/init
root       220  0.0  0.8   8068  4356 ?        Ss   Jun30   0:28 /lib/systemd/systemd-journald
root       225  0.0  0.2  11624  1132 ?        Ss   Jun30   0:00 /lib/systemd/systemd-udevd
root       802  0.0  0.9   8596  5092 ?        Ss   Jun30   0:00 dhclient -v -pf /run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases eth0
root       846  0.0  1.1   8596  5832 ?        Ss   Jun30   0:00 dhclient -v -pf /run/dhclient.eth1.pid -lf /var/lib/dhcp/dhclient.eth1.leases eth1
root       919  0.0  0.2   4356  1484 ?        Ss   Jun30   0:00 /sbin/rpcbind -w
statd      928  0.0  0.3   4544  1616 ?        Ss   Jun30   0:00 /sbin/rpc.statd
root       943  0.0  0.2   2812  1136 ?        Ss   Jun30   0:00 /usr/sbin/rpc.idmapd
root       944  0.0  0.3   5340  1928 ?        Ss   Jun30   0:00 /usr/sbin/smartd -n --interval=31536000
root       945  0.0  0.4   7832  2452 ?        Ss   Jun30   0:00 /usr/sbin/sshd -D
root      3776  0.0  0.9  11568  5008 ?        Ss   15:34   0:00  \_ sshd: tino [priv]
tino      3778  0.8  0.8  11568  4260 ?        S    15:34   0:03      \_ sshd: tino at pts/0
tino      3779  0.1  0.8   6096  4292 pts/0    Ss   15:34   0:00          \_ -bash
tino      3815  0.0  0.4   4760  2240 pts/0    R+   15:41   0:00              \_ ps faux
root       946  0.0  0.2   4980  1492 ?        Ss   Jun30   0:00 /usr/sbin/cron -f
root       947  0.0  0.4  31120  2324 ?        Ssl  Jun30   0:04 /usr/sbin/rsyslogd -n
daemon     948  0.0  0.2   2540  1200 ?        Ss   Jun30   0:00 /usr/sbin/atd -f
root       949  0.0  0.2   4044  1240 ?        Ss   Jun30   0:00 /usr/bin/rsync --daemon --no-detach
message+   952  0.0  0.3   5588  1988 ?        Ss   Jun30   0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
root       956  0.0  0.2   3284  1460 ?        Ss   Jun30   0:00 /lib/systemd/systemd-logind
mail       978  0.0  0.2   3488  1144 ?        S    Jun30   0:00 /usr/sbin/nullmailer-send -s
root       994  0.0  0.2  28452  1280 ?        Sl   Jun30   0:02 qcontrol -f
root      1017  0.0  0.7  22556  4088 ?        Ss   Jun30   0:01 /usr/sbin/nmbd -D
root      1027  0.0  1.1  35356  5656 ?        Ss   Jun30   0:03 /usr/sbin/smbd -D
root      1136  0.0  0.1   2468   748 ?        Ss   Jun30   0:00 /usr/sbin/in.tftpd --listen --user tftp --address 0.0.0.0:69 --secure /srv/tftp
root      1162  0.0  0.3   5376  1876 ?        Ss   Jun30   0:00 /usr/sbin/rpc.mountd --manage-gids
root      3001  0.0  0.0      0     0 ?        Z    06:37   0:00 [killall] <defunct>


$ cat /proc/3001/cmdline
$ sudo cat /proc/3001/stack
[<c001bff0>] do_exit+0x838/0x884
[<c001c0cc>] do_group_exit+0x54/0xb4
[<c001c144>] __wake_up_parent+0x0/0x20
[<ffffffff>] 0xffffffff
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