On Fri, Jul 07 2006, Jens Axboe wrote:
> On Fri, Jul 07 2006, Michael Kerrisk wrote:
> > > > c) Occasionally the command line just hangs, producing no output.
> > > > In this case I can't kill it with ^C or ^\. This is a
> > > > hard-to-reproduce behaviour on my (x86) system, but I have
> > > > seen it several times by now.
> > >
> > > aka local DoS. Please capture sysrq-T output next time.
> >
> > I don't have sysrq configured in the kernel that I'm testing at
> > the moment (I'll build again with sysrq), but have just got
> > the error again. For what it's worth, "ps l" says:
> >
> > F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
> > 0 1000 7099 630 16 0 0 0 - D+ pts/30 0:00 [ktee]
>
> Try ps -eo cmd,wchan, it should give you a little more at least. But
> sysrq-t is the best, of course.
>
> I'll see about reproducing locally.
With your modified ktee, I can reproduce it here. Here's the ktee and wc
output:
ktee2 D 00000002 0 10027 3182 10028 (L-TLB)
f5cd7da0 00000002 f5cd7d8c 00000002 f5cd7d48 c0148c1e f5cd7d58
c18a5914
c03edc80 c19a9f50 00000007 00000000 c1ff1ab0 b5d39d0a 0000003a
067a9ddd
c1ff1bc0 c19aa720 00000000 00000000 06d4480b 00000000 c0474880
c0474880
Call Trace:
[<c0389114>] __mutex_lock_slowpath+0x95/0x236
[<c03892d1>] mutex_lock+0x1c/0x1f
[<c016cff7>] pipe_read_fasync+0x24/0x57
[<c016d2d4>] pipe_read_release+0x12/0x23
[<c01623c7>] __fput+0x53/0x141
[<c016250e>] fput+0x19/0x1c
[<c015fc84>] filp_close+0x41/0x67
[<c0121c1a>] put_files_struct+0xa6/0xb8
[<c0122d06>] do_exit+0x124/0x8dd
[<c01045a7>] do_trap+0x0/0x9e
[<c01179d9>] do_page_fault+0x274/0x586
[<c0103b6d>] error_code+0x39/0x40
[<c0103039>] sysenter_past_esp+0x56/0x79
wc D C1DB7F74 0 10028 3182 10027 (NOTLB)
c1db7ec8 00000002 c1db7eb4 c1db7f74 00000246 00000101 00000001
00000000
00000003 c1db7f68 00000007 00000001 f6351ab0 af26d8c3 0000003a
0011c727
f6351bc0 c19b2720 00000002 00000044 001ce734 00000000 c0474880
c0474880
Call Trace:
[<c0389114>] __mutex_lock_slowpath+0x95/0x236
[<c03892d1>] mutex_lock+0x1c/0x1f
[<c016d910>] pipe_readv+0x54/0x3a9
[<c016dc84>] pipe_read+0x1f/0x21
[<c0161bbf>] vfs_read+0x85/0xf6
[<c0162048>] sys_read+0x3d/0x64
[<c0103039>] sysenter_past_esp+0x56/0x79
I'll dig around.
--
Jens Axboe
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
