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Date: Fri, 24 Sep 2010 15:46:49 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Jeremy Chadwick <freebsd@jdc.parodius.com>
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Cc: freebsd-stable@freebsd.org, Leroy van Logchem <leroy.vanlogchem@gmail.com>
Subject: Re: 8.1-RELEASE: [zfs] [kmem] zfs destroy snapshot results in panic:
 kmem_map too small
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on 24/09/2010 15:33 Jeremy Chadwick said the following:
> On Fri, Sep 24, 2010 at 01:24:46PM +0200, Leroy van Logchem wrote:
>> -----------------------------------------------------------------------------
>> Problem          : Kernel panic "kmem_malloc(114688): kmem_map too small
>> Trigger          : Destroy ZFS snapshots (each bigger >80GB)
>> Version          : FreeBSD 8.1-RELEASE (GENERIC AMD64 but with DDB)
>> ...
>> panic: kmem_malloc(114688): kmem_map too small: 3307884544 total allocated
>> cpuid = 2
>> KDB: stack backtrace:
>> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
>> panic() at panic+0x182
>> kmem_malloc() at kmem_malloc+0x5b5
>> uma_large_malloc() at uma_large_malloc+0x4a
>> malloc() at malloc+0x14b
>> zio_compress_data() at zio_compress_data+0xa2
>> zio_write_bp_init() at zio_write_bp_init+0xc2
>> zio_exectute() at zio_execute+0x77
>> taskq_run_safe() at taskq_run_safe+0x13
>> taskqueue_run() at taskqueue_run+0x91
>> taskqueue_thread_loop() at taskqueue_thread_loop+0x3f
>> fork_exit() at fork_exit+0x12a
>> fork_trampoline() at fork_trampoline+0xe
>> --- trap 0, rip = 0, rsp = 0xffffff81261edd30, rbp = 0 ---
>> panic: kmem_malloc(118784): kmem_map too small: 3307884544 total allocated
>> cpuid = 2
> 
> Can you please provide uname -a output?  The built date of your kernel
> matters in this case.  The panic looks like uma(9) is in use

No, it doesn't.

-- 
Andriy Gapon