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Subject: Problem confirmed
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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.
bug-guix@HIDDEN:bug#74501; Package guix.
Full text available.Received: (at submit) by debbugs.gnu.org; 24 Nov 2024 00:32:52 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Nov 23 19:32:52 2024 Received: from localhost ([127.0.0.1]:59952 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tF0YW-00082P-0k for submit <at> debbugs.gnu.org; Sat, 23 Nov 2024 19:32:52 -0500 Received: from lists.gnu.org ([209.51.188.17]:59264) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <plattfot@HIDDEN>) id 1tF0YT-00082G-7w for submit <at> debbugs.gnu.org; Sat, 23 Nov 2024 19:32:49 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <plattfot@HIDDEN>) id 1tF0YR-0003jB-F2 for bug-guix@HIDDEN; Sat, 23 Nov 2024 19:32:48 -0500 Received: from mout02.posteo.de ([185.67.36.66]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <plattfot@HIDDEN>) id 1tF0YO-0006cM-Od for bug-guix@HIDDEN; Sat, 23 Nov 2024 19:32:47 -0500 Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 49916240101 for <bug-guix@HIDDEN>; Sun, 24 Nov 2024 01:32:38 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1732408359; bh=TuUm4e19Hd47l81sLiuWjPSt2One5zrO9Z7CQKoUMMQ=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=ZNtD4AobXpuC7p65+Mvt9M2yHnqwGuKTtysskOOwb8pDBihAOJaA/kCH1SM30kBs+ xb910J9g8nLwvwa1Hbeuu8ANO76EBvffFLFHLCPs/989WTSOy796l6TGh7dxTKbPlg /fLh7AnyhdcRxo3LRkMjlMytzZiM6S/tgcELEHxre64GdRKLASBzlW3ELhEFqVC1Yv DRoZq7TI1BBAqKjZCEsm4JbfofqDC7ktjhe9ndwqd5sGBY/o0UWrn0WvnpUKf6H32Z UKaJMijuc9FVbkkH53yMu8N+zAo5RkTPyDpFM6t4y68hyeiRJfhV5Z6Fe5/BWqHoMp hjTQPXxsQ8rFw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4XwqYL1Lp6z9rxG for <bug-guix@HIDDEN>; Sun, 24 Nov 2024 01:32:37 +0100 (CET) From: Fredrik Salomonsson <plattfot@HIDDEN> To: bug-guix@HIDDEN Subject: ntpd segfaults at boot (take 2) Date: Sun, 24 Nov 2024 00:32:34 +0000 Message-ID: <87iksdii8t.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=185.67.36.66; envelope-from=plattfot@HIDDEN; helo=mout02.posteo.de X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HEXHASH_WORD=1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.3 (-) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -2.3 (--) 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@HIDDEN 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
Fredrik Salomonsson <plattfot@HIDDEN>:bug-guix@HIDDEN.
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