Re: [uml-devel] Fwd: Re: UML kernel crash of v2.6.36-rcX kernel
Hello, I'm currently in the progress of bisecting the issue again- with a fully autoamted scripts which doesn't alck a "make clean" - *shame* However I get with v2.6.35-rc3-173-g3638632 and the attached .config this : nitializing software serial port version 1 console [mc-1] enabled ubda: EIP: 0073:[<081bfec3>] CPU: 0 Not tainted ESP: 007b:1845aa08 EFLAGS: 00010297 Not tainted EAX: EBX: 184da000 ECX: 0001 EDX: ESI: 185fb930 EDI: 185f6900 EBP: 1845aa20 DS: 007b ES: 007b 082fab68: [<08075f5d>] show_regs+0xed/0x120 082fab84: [<0805e50e>] segv+0x25e/0x2b0 082fac3c: [<0805e5a1>] segv_handler+0x41/0x60 082fac5c: [<0806eb64>] sig_handler_common+0x54/0xa0 082facd8: [<0806ed07>] sig_handler+0x27/0x50 082face8: [<0806ef5c>] handle_signal+0x5c/0xa0 082fad0c: [<080712d8>] hard_handler+0x18/0x20 082fad1c: [] 0xb77de400 Kernel panic - not syncing: Segfault with no mm 082fab50: [<08277d5b>] dump_stack+0x22/0x24 082fab68: [<08277dbe>] panic+0x61/0xdb 082fab84: [<0805e51a>] segv+0x26a/0x2b0 082fac3c: [<0805e5a1>] segv_handler+0x41/0x60 082fac5c: [<0806eb64>] sig_handler_common+0x54/0xa0 082facd8: [<0806ed07>] sig_handler+0x27/0x50 082face8: [<0806ef5c>] handle_signal+0x5c/0xa0 082fad0c: [<080712d8>] hard_handler+0x18/0x20 082fad1c: [] 0xb77de400 EIP: 0073:[] CPU: 0 Not tainted ESP: 007b:bf83a460 EFLAGS: 0246 Not tainted EAX: EBX: 6c83 ECX: 0013 EDX: 6c83 ESI: 6c7f EDI: bf83a4f4 EBP: bf83a494 DS: 007b ES: 007b 082fab04: [<08075f5d>] show_regs+0xed/0x120 082fab20: [<0805e7dc>] panic_exit+0x2c/0x50 082fab30: [<0809928e>] notifier_call_chain+0x3e/0x70 082fab58: [<08099313>] atomic_notifier_call_chain+0x23/0x30 082fab68: [<08277de6>] panic+0x89/0xdb 082fab84: [<0805e51a>] segv+0x26a/0x2b0 082fac3c: [<0805e5a1>] segv_handler+0x41/0x60 082fac5c: [<0806eb64>] sig_handler_common+0x54/0xa0 082facd8: [<0806ed07>] sig_handler+0x27/0x50 082face8: [<0806ef5c>] handle_signal+0x5c/0xa0 082fad0c: [<080712d8>] hard_handler+0x18/0x20 082fad1c: [] 0xb77de400 /home/tfoerste/workspace/bin/start_uml.sh: line 64: 27775 Segmentation fault (core dumped) $LINUX ubda=$ROOT_FS ubdb=$SWAP_FS $CD eth0=tuntap,,,$TAP mem=256M umid=$USER $TTY $* Richard Weinberger wrote at 19:46:53 > Hi! > > Can you please post more details. > What exactly causes the crash? > phpsysinfo does a lot of stuff. > On my test bed it works fine. > > Am Freitag 15 Oktober 2010, 11:33:37 schrieben Sie: > > Hello, > > > > git bisect gave : > > > > tfoer...@n22 ~/devel/linux-2.6 $ git bisect bad > > 365b18189789bfa1acd9939e6312b8a4b4577b28 is the first bad commit > > commit 365b18189789bfa1acd9939e6312b8a4b4577b28 > > Author: Christoph Hellwig > > Date: Wed Jul 7 18:53:25 2010 +0200 > > > > add f_flags to struct statfs(64) > > > > Add a flags field to help glibc implementing statvfs(3) efficiently. > > > > We copy the flag values from glibc, and add a new ST_VALID flag to > > denote that f_flags is implemented. > > > > Signed-off-by: Christoph Hellwig > > Signed-off-by: Al Viro > > : > > :04 04 92f04bf96f0c6bb2df3ddea83a4a27c35985bdcc > > > > e702d8dd95a3897e085bf3fe4919e2dd30a57b47 M arch > > > > :04 04 5705bba0e9a2a61112281f7bb1a1030ef9eb337e > > > > 34fc3ea912581ae7923a15246291387bfc354e47 M fs > > > > :04 04 578a5bb0743aa85adfec7a25f82d440b2ea4db27 > > > > 7e96f95b6f1d6ccc9e004b560670638db66b8a93 M include > > > > > > BTW is UML dead ? > > (I'm asking b/c there're so many different issues - compile errors or the > > UML kernel crashes during start or during shutdown, independent of the > > result of the wget issue I was investigating - there are 120 skip'ed > > commits within the git bisect log beside 46 good and 15 bad commits and I > > didn't saw any chance to fully automate the bisect) > > Hmm, I did a lot git bisects on UML 2.6.35 to 2.6.36. > 2.6.36-rc1 does not always compile. You need no apply f3c072a first. > I've not seen any crashes during bootup nor shutdown. Can you provide some > more details? > > Thanks, > //richard -- MfG/Kind regards Toralf Förster pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3 # # Automatically generated make config: don't edit # Linux kernel version: 2.6.35-rc3 # Sat Oct 16 10:32:28 2010 # CONFIG_DEFCONFIG_LIST="arch/$ARCH/defconfig" CONFIG_GENERIC_HARDIRQS=y CONFIG_UML=y CONFIG_MMU=y CONFIG_NO_IOMEM=y # CONFIG_TRACE_IRQFLAGS_SUPPORT is not set CONFIG_LOCKDEP_SUPPORT=y # CONFIG_STACKTRACE_SUPPORT is not set CONFIG_GENERIC_CALIBRATE_DELAY=y CONFIG_GENERIC_BUG=y CONFIG_GENERIC_TIME=y CONFIG_GENERIC_CLOCKEVENTS=y CONFIG_IRQ_RELEASE_METHOD=y CONFIG_HZ=100 # # UML-specific options # # # Host processor type and features # # CONFIG_M386 is not set # CONFIG_M486 is not set # CONFIG_M586 is not set # CONFIG_M586TSC is not set # CONFIG_M586MMX is not set # CONFIG_M686 is not set # CONFIG_MPENTIUMII is not set # CONFIG_MPENTIUMI
[uml-devel] [PATCH 1/1] um: fix global timer issue when using CONFIG_NO_HZ
This fixes a issue which was introduced by fe2cc53e.
timeval_to_ns() returns long long and not int.
Due to that UML's timer did not work proper and caused timer freezes.
LKML-Reference:
Signed-off-by: Richard Weinberger
---
arch/um/os-Linux/time.c |2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index dec5678..6e3359d 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -60,7 +60,7 @@ static inline long long timeval_to_ns(const struct timeval
*tv)
long long disable_timer(void)
{
struct itimerval time = ((struct itimerval) { { 0, 0 }, { 0, 0 } });
- int remain, max = UM_NSEC_PER_SEC / UM_HZ;
+ long long remain, max = UM_NSEC_PER_SEC / UM_HZ;
if (setitimer(ITIMER_VIRTUAL, &time, &time) < 0)
printk(UM_KERN_ERR "disable_timer - setitimer failed, "
--
1.6.6.1
--
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Re: [uml-devel] [REGRESSION] um: rcu_sched_state detected stall on CPU 0
On Fri, Oct 15, 2010 at 9:48 AM, Peter Zijlstra wrote: > On Fri, 2010-10-15 at 10:02 +0300, Pekka Enberg wrote: >> On Fri, Oct 15, 2010 at 2:44 AM, richard -rw- weinberger >> wrote: >> > On Thu, Oct 14, 2010 at 9:50 PM, Arjan van de Ven >> wrote: >> >> On 10/14/2010 11:27 AM, richard -rw- weinberger wrote: >> >>> >> >>> Hi Arjan! >> >>> >> >>> This commit causes some problems on UML. >> >>> >> >> that is extremely weird. >> >>> >> >>> The kernel freezes after a few seconds until it gets some input. >> >>> e.g: When I run top it stops refreshing the process list until i >> press a >> >>> button. >> >> >> >> a slab timer change (to not be as critical) causing global timer >> issues >> >> that's very obviously not a problem with this patch. >> >> has this been seem anywhere except UML ? >> > >> > A small update: >> > It seems that CONFIG_NO_HZ is broken on UML. :-( >> > >> > CONFIG_NO_HZ + CONFIG_SLAB: works >> > CONFIG_NO_HZ + CONFIG_SLAB + your patch: broken >> > CONFIG_NO_HZ + CONFIG_SLUB: broken >> > >> > CONFIG_SLAB + your patch: works >> > CONFIG_SLAB: works >> > CONFIG_SLUB: works >> >> Thanks for testing! Thomas, Ingo, Peter, I'm not sure who maintains >> CONFIG_NO_HZ so I CC'd you. The problem here is that Arjan's >> deferrable timers patch in SLAB triggered something that looks like a >> latent bug with UML and NOHZ. > > Thomas does mostly, but if its UML specific, I guess its Jeff Dike > you'll be wanting to talk to, since he's the arch maintainer. After reviewing the code for hours I've found the bug. It's a int/long long issue within arch/um/os-Linux/time.c. A patch is on the way! -- Thanks, //richard -- Download new Adobe(R) Flash(R) Builder(TM) 4 The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly Flex(R) Builder(TM)) enable the development of rich applications that run across multiple browsers and platforms. Download your free trials today! http://p.sf.net/sfu/adobe-dev2dev ___ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
