Package: guix;
Reported by: Fredrik Salomonsson <plattfot <at> posteo.net>
Date: Sun, 24 Nov 2024 00:33:01 UTC
Severity: normal
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bug-guix <at> gnu.org:bug#74501; Package guix.
(Sun, 24 Nov 2024 00:33:02 GMT) Full text and rfc822 format available.Fredrik Salomonsson <plattfot <at> posteo.net>:bug-guix <at> gnu.org.
(Sun, 24 Nov 2024 00:33:02 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Fredrik Salomonsson <plattfot <at> posteo.net> To: bug-guix <at> gnu.org Subject: ntpd segfaults at boot (take 2) Date: Sun, 24 Nov 2024 00:32:34 +0000
Hi, Similar to issue 73873 [0], I'm also seeing ntpd segfaults at boot and it looks to be due to ipv6: In /var/log/messages --8<---------------cut here---------------start------------->8--- Nov 23 16:13:41 localhost ntpd[1019]: ntpd 4.2.8p18 <at> 1.4062-o Thu Jan 1 00:00:01 UTC 1970 (1): Starting Nov 23 16:13:41 localhost ntpd[1019]: Command line: /gnu/store/s4ra0g0ym1q1wh5jrqs60092x1nrb8h9-ntp-4.2.8p18/bin/ntpd -n -c /gnu/store/ghh3m9wzraszf7p4ynac006x96svddbq-ntpd.conf -u ntpd -g Nov 23 16:13:41 localhost ntpd[1019]: ---------------------------------------------------- Nov 23 16:13:41 localhost ntpd[1019]: ntp-4 is maintained by Network Time Foundation, Nov 23 16:13:41 localhost ntpd[1019]: Inc. (NTF), a non-profit 501(c)(3) public-benefit Nov 23 16:13:41 localhost ntpd[1019]: corporation. Support and training for ntp-4 are Nov 23 16:13:41 localhost ntpd[1019]: available at https://www.nwtime.org/support Nov 23 16:13:41 localhost ntpd[1019]: ---------------------------------------------------- Nov 23 16:13:41 localhost ntpd[1019]: DEBUG behavior is enabled - a violation of any diagnostic assertion will cause ntpd to abort Nov 23 16:13:41 localhost ntpd[1019]: proto: precision = 0.040 usec (-24) Nov 23 16:13:41 localhost ntpd[1019]: baseday_set_day: invalid day (25556), UNIX epoch substituted Nov 23 16:13:41 localhost ntpd[1019]: basedate set to 1970-01-01 Nov 23 16:13:41 localhost ntpd[1019]: gps base set to 1980-01-06 (week 0) Nov 23 16:13:41 localhost ntpd[1019]: Listen and drop on 0 v6wildcard [::]:123 Nov 23 16:13:41 localhost ntpd[1019]: Listen and drop on 1 v4wildcard 0.0.0.0:123 Nov 23 16:13:41 localhost ntpd[1019]: Listen normally on 2 lo 127.0.0.1:123 Nov 23 16:13:41 localhost ntpd[1019]: Listen normally on 3 enp37s0 192.168.1.8:123 Nov 23 16:13:41 localhost vmunix: [ 22.648239] ntpd[1019]: segfault at 24 ip 000055fe102ab29b sp 00007ffc26382ca0 error 4 in ntpd[7f29b,55fe1023e000+86000] likely on CPU 0 (core 0, socket 0) Nov 23 16:13:41 localhost ntpd[1019]: Listen normally on 4 lo [::1]:123 Nov 23 16:13:41 localhost vmunix: [ 22.649529] Code: 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 e8 dc 2d f9 ff 44 8b 28 48 89 c5 e8 61 9e ff ff 49 89 c4 48 85 db 0f 84 e5 00 00 00 <44> 0f b7 0b 66 41 83 f9 02 0f 84 f6 00 00 00 66 41 83 f9 0a 74 57 Nov 23 16:13:41 localhost ntpd[1019]: bind(21) AF_INET6 [2001:REDACTED:cedf]:123 flags 0x11 failed: Cannot assign requested address Nov 23 16:13:41 localhost ntpd[1019]: unable to create socket on enp37s0 (5) for [2001:REDACTED:cedf]:123 Nov 23 16:13:41 localhost shepherd[1]: Service ntpd (PID 1019) terminated with signal 11. Nov 23 16:13:41 localhost shepherd[1]: Service ntpd has been disabled. Nov 23 16:13:41 localhost shepherd[1]: (Respawning too fast.) --8<---------------cut here---------------end--------------->8--- And `sudo dmesg`: --8<---------------cut here---------------start------------->8--- [ 21.871447] ntpd[954]: segfault at 24 ip 000055abbdf0029b sp 00007ffebf673770 error 4 in ntpd[7f29b,55abbde93000+86000] likely on CPU 7 (core 9, socket 0) [ 21.871453] Code: 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 e8 dc 2d f9 ff 44 8b 28 48 89 c5 e8 61 9e ff ff 49 89 c4 48 85 db 0f 84 e5 00 00 00 <44> 0f b7 0b 66 41 83 f9 02 0f 84 f6 00 00 00 66 41 83 f9 0a 74 57 [ 22.002809] ntpd[1005]: segfault at 24 ip 000055ac349d229b sp 00007fff8be14a00 error 4 in ntpd[7f29b,55ac34965000+86000] likely on CPU 12 (core 0, socket 0) [ 22.002863] Code: 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 e8 dc 2d f9 ff 44 8b 28 48 89 c5 e8 61 9e ff ff 49 89 c4 48 85 db 0f 84 e5 00 00 00 <44> 0f b7 0b 66 41 83 f9 02 0f 84 f6 00 00 00 66 41 83 f9 0a 74 57 [ 22.131272] ntpd[1008]: segfault at 24 ip 0000556dc1ad529b sp 00007ffef46b9d50 error 4 in ntpd[7f29b,556dc1a68000+86000] likely on CPU 3 (core 3, socket 0) [ 22.132111] Code: 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 e8 dc 2d f9 ff 44 8b 28 48 89 c5 e8 61 9e ff ff 49 89 c4 48 85 db 0f 84 e5 00 00 00 <44> 0f b7 0b 66 41 83 f9 02 0f 84 f6 00 00 00 66 41 83 f9 0a 74 57 [ 22.264012] ntpd[1011]: segfault at 24 ip 000055e02824f29b sp 00007fffa1e29970 error 4 in ntpd[7f29b,55e0281e2000+86000] likely on CPU 4 (core 4, socket 0) [ 22.264019] Code: 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 e8 dc 2d f9 ff 44 8b 28 48 89 c5 e8 61 9e ff ff 49 89 c4 48 85 db 0f 84 e5 00 00 00 <44> 0f b7 0b 66 41 83 f9 02 0f 84 f6 00 00 00 66 41 83 f9 0a 74 57 [ 22.390893] ntpd[1014]: segfault at 24 ip 0000555b2757129b sp 00007ffe2d0ea050 error 4 in ntpd[7f29b,555b27504000+86000] likely on CPU 4 (core 4, socket 0) [ 22.390898] Code: 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 e8 dc 2d f9 ff 44 8b 28 48 89 c5 e8 61 9e ff ff 49 89 c4 48 85 db 0f 84 e5 00 00 00 <44> 0f b7 0b 66 41 83 f9 02 0f 84 f6 00 00 00 66 41 83 f9 0a 74 57 [ 22.517794] ntpd[1016]: segfault at 24 ip 000056387455529b sp 00007ffde75cabf0 error 4 in ntpd[7f29b,5638744e8000+86000] likely on CPU 4 (core 4, socket 0) [ 22.518953] Code: 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 e8 dc 2d f9 ff 44 8b 28 48 89 c5 e8 61 9e ff ff 49 89 c4 48 85 db 0f 84 e5 00 00 00 <44> 0f b7 0b 66 41 83 f9 02 0f 84 f6 00 00 00 66 41 83 f9 0a 74 57 [ 22.648239] ntpd[1019]: segfault at 24 ip 000055fe102ab29b sp 00007ffc26382ca0 error 4 in ntpd[7f29b,55fe1023e000+86000] likely on CPU 0 (core 0, socket 0) [ 22.649529] Code: 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 e8 dc 2d f9 ff 44 8b 28 48 89 c5 e8 61 9e ff ff 49 89 c4 48 85 db 0f 84 e5 00 00 00 <44> 0f b7 0b 66 41 83 f9 02 0f 84 f6 00 00 00 66 41 83 f9 0a 74 57 --8<---------------cut here---------------end--------------->8--- It's been doing that since around the time of issue 73873 [0]. I double checked and it does use the 2.guix.pool.ntp.org pool. I also reverted back to 0.guix.pool.ntp.org in case for some reason that would work. Both segfaults ntpd. Did 2.guix.pool.ntp.org stop supporting ipv6? Thanks [0] https://issues.guix.gnu.org/73873 -- s/Fred[re]+i[ck]+/Fredrik/g
bug-guix <at> gnu.org:bug#74501; Package guix.
(Sun, 15 Dec 2024 00:53:02 GMT) Full text and rfc822 format available.Message #8 received at 74501 <at> debbugs.gnu.org (full text, mbox):
From: "Danny Milosavljevic" <dannym <at> scratchpost.org> To: 74501 <at> debbugs.gnu.org Subject: Problem confirmed Date: Sun, 15 Dec 2024 01:52:46 +0100 (CET)
Hi,
I also have this problem on x86_64 znver3.
I disassembled my "Code:" block and I get:
8b 04 25 28 00 00 00 mov eax, DWORD PTR ds:0x28
48 89 44 24 08 mov QWORD PTR [rsp+0x8], rax
31 c0 xor eax, eax
e8 dc 2d f9 ff call <relative_address>
44 8b 28 mov r13d, DWORD PTR [rax]
48 89 c5 mov rbp, rax
e8 61 9e ff ff call <relative_address>
49 89 c4 mov r12, rax
48 85 db test rbx, rbx
0f 84 e5 00 00 00 je <forward_jump>
<44> 0f b7 0b movzx r9d, WORD PTR [rbx] ; <-- This is where <44> is
66 41 83 f9 02 cmp r9w, 0x2
0f 84 f6 00 00 00 je <forward_jump>
66 41 83 f9 0a cmp r9w, 0xa
74 57 je <forward_jump>
The 0x44 byte in this instruction is part of the REX prefix that indicates the use of an extended register (r9d in this case).
The error code is a combination of several error bits defined in fault.c in the Linux kernel:
/*
* Page fault error code bits:
*
* bit 0 == 0: no page found 1: protection fault
* bit 1 == 0: read access 1: write access
* bit 2 == 0: kernel-mode access 1: user-mode access
* bit 3 == 1: use of reserved bit detected
* bit 4 == 1: fault was an instruction fetch
* bit 5 == 1: protection keys block access
* bit 6 == 1: shadow stack access fault
* bit 15 = 1: SGX MMU page-fault
*/
enum x86_pf_error_code {
X86_PF_PROT = 1 << 0,
X86_PF_WRITE = 1 << 1,
X86_PF_USER = 1 << 2,
X86_PF_RSVD = 1 << 3,
X86_PF_INSTR = 1 << 4,
X86_PF_PK = 1 << 5,
X86_PF_SHSTK = 1 << 6,
X86_PF_SGX = 1 << 15,
};
Since ntpd is a user-mode program, X86_PF_USER is set and the error code is at least 4.
If the error code is 4, then the faulty memory access is a read from user space.
In total:
- User-mode access.
- Read access.
- No page found.
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