Date: Tue, 12 Oct 2021 20:39:55 +0200 From: Peter Eriksson <pen@lysator.liu.se> To: freebsd-current <freebsd-current@freebsd.org> Subject: Panic in pipe_write from syslogd in 12.2? Message-ID: <0FFAABE0-F260-4FE0-8B1D-1F179C502170@lysator.liu.se>
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--Apple-Mail=_D3BCACE6-ED8F-48FE-A21A-AEE636A6A5EC Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 I just noticed that a couple of my 12.2-RELEASE-p4 running servers = have=E2=80=A6 8263, 14474 and 3831 defunct subprocesses from syslogd and = also seems to have stopped writing to the log files=E2=80=A6 When I = tried to kill syslogd on a fourth server (with some X000 defunct = processes) the machine panic=E2=80=99ed and rebooted. I seem to have a vague memory of this being a known bug/someone saw = something similar or perhaps even solved in later patch releases? But my = google-fu seems to be failing me today. Anyone else remember? (The one that panic=E2=80=99ed is now running -p10 instead which they = should have done a long time ago but=E2=80=A6) I reported it on the FreeBSD bugzilla: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D259084 = <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D259084>; Output from one that still is running: # egrep syslogd /var/log/sys/15:10/procstat-kk-a.log 9212 101640 syslogd - mi_switch+0xd4 = sleepq_catch_signals+0x403 sleepq_wait_sig+0xf _sleep+0x1de = pipe_write+0x583 dofilewrite+0xb0 sys_write+0xc0 amd64_syscall+0x387 = fast_syscall_common+0xf8 Output from the one that panic=E2=80=99ed: Fatal trap 12: page fault while in kernel mode cpuid =3D 20; apic id =3D 14 fault virtual address =3D 0x410 fault code =3D supervisor read data, page not present instruction pointer =3D 0x20:0xffffffff80b9f55c stack pointer =3D 0x28:0xfffffe14debc6710 frame pointer =3D 0x28:0xfffffe14debc6790 code segment =3D base r = <https://svnweb.freebsd.org/changeset/base/>x0, limit 0xfffff, type 0x1b =3D DPL 0, pres 1, long 1, def32 0, gran 1 processor eflags =3D interrupt enabled, resume, IOPL =3D 0 current process =3D 9277 (sshd) trap number =3D 12 panic: page fault cpuid =3D 20 time =3D 1633990484 KDB: stack backtrace: #0 0xffffffff80c0ad75 at kdb_backtrace+0x65 #1 0xffffffff80bbf02b at vpanic+0x17b #2 0xffffffff80bbeea3 at panic+0x43 #3 0xffffffff8108e911 at trap_fatal+0x391 #4 0xffffffff8108e96f at trap_pfault+0x4f #5 0xffffffff8108dfb6 at trap+0x286 #6 0xffffffff81066c28 at calltrap+0x8 #7 0xffffffff80c6365f at unp_pcb_owned_lock2_slowpath+0x12f #8 0xffffffff80c61e0f at uipc_send+0x139f #9 0xffffffff80c55b7a at sosend_generic+0x4ca #10 0xffffffff80c55f90 at sosend+0x50 #11 0xffffffff80c5cc55 at kern_sendit+0x225 #12 0xffffffff80c5cfcc at sendit+0x19c #13 0xffffffff80c5ce1d at sys_sendto+0x4d #14 0xffffffff8108f4c7 at amd64_syscall+0x387 #15 0xffffffff8106754e at fast_syscall_common+0xf8 Uptime: 212d21h35m47s - Peter --Apple-Mail=_D3BCACE6-ED8F-48FE-A21A-AEE636A6A5EC--
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