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List: musl
Subject: [musl] [bug] musl Daylight Saving Time across year bug
From: "wanghaitao (G)" <ouyang.wanghaitao () huawei ! com>
Date: 2023-12-19 1:52:59
Message-ID: 0202da277f3d4972a8a70571c5b39a73 () huawei ! com
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Hello everyone,
I found a bug related to musl daylight saving time setting.
We are set to enter Daylight Saving Time at 10pm on the last day of 2021,
offset Daylight Saving Time by 2 hours, and end Daylight Saving Time on the=
first day of 2022.
However, it did not recover immediately after entering 2022, but it was del=
ayed for more than ten hours before recovery to normal time.
We use the musl version 1.2.3
We put the TZ variable settings in /var/time/TZ and use soft links to use i=
t.
cat /var/time/TZ
GMT-08:00DST-10:00:00,M12.5.5/18:45:0,M1.1.6/6:0:0
we have a soft link from /system/etc/TZ -> /var/time/TZ, and /etc/TZ -> /va=
r/time/TZ
Here is our env info:
root:/# cat /proc/version
Linux version 5.10.97+ (z30045507@kwemhisprc00189) (aarch64-none-linux-gnu-=
gcc (
Arm GNU Toolchain 12.2.Rel1 (Build arm-12.24)) 12.2.1 20221205, GNU ld (Arm=
GNU
Toolchain 12.2.Rel1 (Build arm-12.24)) 2.39.0.20221210) #1 SMP PREEMPT Thu =
Dec 1
4 10:14:45 CST 2023
After looking at the src code I found in the src/time/__tz.c:406, there is =
a comment:
FIXME: may be broken if DST changes right at year boundary? Also, this coul=
d be more efficient.
I would like to ask if the current bug is the FIXME written in the comments=
here. Is there any solution?
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<p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">Hello \
everyone,<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">I found a \
bug related to musl daylight saving time setting. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">We are \
set to enter Daylight Saving Time at 10pm on the last day of 2021, \
<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">offset \
Daylight Saving Time by 2 hours, and end Daylight Saving Time on the first day of \
2022.<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">However, \
it did not recover immediately after entering 2022, but it was delayed for more than \
ten hours before recovery to normal time.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">We use \
the musl version 1.2.3<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">We put \
the TZ variable settings in /var/time/TZ and use soft links to use \
it.<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">cat \
/var/time/TZ <br>
GMT-08:00DST-10:00:00,M12.5.5/18:45:0,M1.1.6/6:0:0<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">we have a \
soft link from /system/etc/TZ -> /var/time/TZ, and /etc/TZ -> \
/var/time/TZ<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">Here is \
our env info:<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">root:/# \
cat /proc/version<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">Linux \
version 5.10.97+ (z30045507@kwemhisprc00189) (aarch64-none-linux-gnu-gcc \
(<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">Arm GNU \
Toolchain 12.2.Rel1 (Build arm-12.24)) 12.2.1 20221205, GNU ld (Arm \
GNU<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">Toolchain \
12.2.Rel1 (Build arm-12.24)) 2.39.0.20221210) #1 SMP PREEMPT Thu Dec \
1<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">4 \
10:14:45 CST 2023<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">After \
looking at the src code I found in the src/time/__tz.c:406, there is a \
comment:<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">FIXME: \
may be broken if DST changes right at year boundary? Also, this could be more \
efficient.<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif">I would \
like to ask if the current bug is the FIXME written in the comments here. Is there \
any solution?<o:p></o:p></span></b></p> <p class="MsoNormal"><span lang="EN-US" \
style="font-family:"微软雅黑",sans-serif"><o:p> </o:p></span></p>
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style="font-family:"微软雅黑",sans-serif"><o:p></o:p></span></p>
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