[systemd-bugs] [Bug 76886] Journald can cause an endless loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76886

--- Comment #2 from Abylay Ospan <aospan at netup.ru> ---
I observe same infinite loop. systemd-journald read following:
p=7,5120,282337378,-;power_supply AC: prop ONLINE=1
 SUBSYSTEM=power_supply
 DEVICE=+power_supply:AC

and then read '/sys/class/power_supply/AC/uevent' again which cause above
message again => infinite loop (100% CPU usage by systemd-journald).
If this kernel bug do we need to send bug report/patch to kernel ?

For now I have disabled 'CONFIG_POWER_SUPPLY_DEBUG'. For me this 'fix' is ok (I
don't need this debug).



Here is backtrace:

/dev/kmsg buffer overrun, some messages lost.

Breakpoint 1, device_read_uevent_file (device=0x5555555caf20) at
src/libsystemd/sd-device/sd-device.c:482
482     in src/libsystemd/sd-device/sd-device.c
(gdb) bt
#0  device_read_uevent_file (device=0x5555555caf20) at
src/libsystemd/sd-device/sd-device.c:482
#1  0x0000555555587368 in sd_device_get_devname (device=0x5555555caf20,
devname=0x7fffffffb8d0) at src/libsystemd/sd-device/sd-device.c:933
#2  0x0000555555581b14 in udev_device_get_devnode (udev_device=0x5555555cacb0)
at src/libudev/libudev-device.c:677
#3  0x000055555555be2d in dev_kmsg_record (s=0x7fffffffe450, p=0x7fffffffc2c3
"power_supply AC: prop ONLINE=1", l=0) at src/journal/journald-kmsg.c:228
#4  0x000055555555c834 in server_read_dev_kmsg (s=0x7fffffffe450) at
src/journal/journald-kmsg.c:348
#5  0x000055555555cb13 in dispatch_dev_kmsg (es=0x5555555c96b0, fd=7,
revents=1, userdata=0x7fffffffe450) at src/journal/journald-kmsg.c:390
#6  0x000055555558d0c1 in source_dispatch (s=0x5555555c96b0) at
src/libsystemd/sd-event/sd-event.c:2114
#7  0x000055555558e4f8 in sd_event_dispatch (e=0x5555555c91e0) at
src/libsystemd/sd-event/sd-event.c:2471
#8  0x000055555558e670 in sd_event_run (e=0x5555555c91e0,
timeout=18446744073709551615) at src/libsystemd/sd-event/sd-event.c:2499
#9  0x000055555555ae0d in main (argc=1, argv=0x7fffffffe768) at
src/journal/journald.c:106
(gdb) frame 3
#3  0x000055555555be2d in dev_kmsg_record (s=0x7fffffffe450, p=0x7fffffffc2c3
"power_supply AC: prop ONLINE=1", l=0) at src/journal/journald-kmsg.c:228
228     src/journal/journald-kmsg.c: No such file or directory.
(gdb) p kernel_device
$1 = 0x5555555ca5ef "+power_supply:AC"

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