Re: kern/52034 (Kernel panic on Google Compute Engine)

[Benny Siegert <bsiegert%gmail.com@localhost>]

The following reply was made to PR kern/52034; it has been noted by GNATS.

From: Benny Siegert <bsiegert%gmail.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: jdolecek%NetBSD.org@localhost,
 gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost,
 bsiegert%NetBSD.org@localhost
Subject: Re: kern/52034 (Kernel panic on Google Compute Engine)
Date: Sun, 2 Jul 2017 12:32:26 +0100

 > With a non-DIAGNOSTIC kernel, there is no error or anything, it just
 > tends to panic if you do disk-intensive workloads, e.g. unpacking a
 > pkgsrc tarball.
 >=20
 > I tried a DIAGNOSTIC kernel on -current (just before your fix) and had
 > no problem. Will try the kernel with the refactored driver next.
 
 I tried the following:
 
 I downloaded =
 http://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-7-1/201706301130Z/amd64/bi=
 nary/kernel/netbsd-GENERIC.gz. This identifies as NetBSD 7.1.0_PATCH =
 (GENERIC.201706301130Z).
 
 Unpacking a pkgsrc tarball makes the whole machine hang after a few =
 minutes; I can see disk activity going to 0 in external monitoring. =
 Breaking into ddb at this point shows that the machine is =E2=80=9Eidle=E2=
 =80=9C and all processes with disk access are in tstile:
 
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 rip ffffffff8028259d cs 8 rflags 202 cr2 =
 ffff80008af4e000 ilevel 8 rsp fffffe810da84d00
 curlwp 0xfffffe821f770840 pid 0.2 lowest kstack 0xfffffe810da822c0
 Stopped in pid 0.2 (system) at  netbsd:breakpoint+0x5:  leave
 db{0}> bt
 breakpoint() at netbsd:breakpoint+0x5
 comintr() at netbsd:comintr+0x524
 Xintr_ioapic_edge4() at netbsd:Xintr_ioapic_edge4+0xea
 --- interrupt ---
 x86_stihlt() at netbsd:x86_stihlt+0x6
 acpicpu_cstate_idle_enter() at netbsd:acpicpu_cstate_idle_enter+0xc2
 acpicpu_cstate_idle() at netbsd:acpicpu_cstate_idle+0x6d
 idle_loop() at netbsd:idle_loop+0xe8
 db{0}> ps
 PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
 107      1 3   1         0   fffffe8117b405c0               cron tstile
 826      1 3   0         0   fffffe821d9b6660                tar tstile
 831      1 3   0        80   fffffe8117b401a0              xzcat pipe_wr
 510      1 3   1        80   fffffe810e23e120                ksh pause
 623      1 3   0        80   fffffe810e23e540               sshd select
 661      1 3   0        80   fffffe810e20d940               sshd select
 677      1 3   1         0   fffffe810e217980              getty tstile
 804      1 3   1        80   fffffe821dae7600               cron nanoslp
 636      1 3   0        80   fffffe821be8dac0              inetd kqueue
 461      1 3   1        80   fffffe8167ed81c0               qmgr kqueue
 605      1 3   0        80   fffffe821d9b3200             pickup kqueue
 753      1 3   1        80   fffffe821bba4260             master kqueue
 507      1 3   0        80   fffffe821da84220               sshd select
 435      1 3   1        80   fffffe821dae7a20             powerd kqueue
 295      1 3   1         0   fffffe821dae71e0            syslogd tstile
 249      1 3   0        80   fffffe8167ed8a00             dhcpcd kqueue
 1        1 3   1        80   fffffe810e39d9a0               init wait
 0       42 3   0       200   fffffe810eade9c0            physiod physiod
 0       41 3   1       200   fffffe8117b409e0           aiodoned =
 aiodoned
 0       40 3   1       200   fffffe810eade180            ioflush tstile
 0       39 3   1       200   fffffe810eade5a0           pgdaemon =
 pgdaemon=