Re: panic: mutex Giant not owned at src/sys/security/mac/mac_net.c:355

From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 04/22/04

  • Next message: Simon L. Nielsen: "Re: panic: mutex Giant not owned at src/sys/security/mac/mac_net.c:355" 
    Date: Thu, 22 Apr 2004 17:19:32 -0400 (EDT)
To: "Simon L. Nielsen" <simon@FreeBSD.org>

    On Thu, 22 Apr 2004, Simon L. Nielsen wrote:

    > I have a reproduceable panic when I have MAC enabled in my kernel and I
    > try to run tcpdump on the interface I have logged in on via ssh (I'm not
    > really sure why it only happens in this case and in other cases). I run
    > "tcpdump -n -i sis0" and the panic as shown below. I do not have any
    > MAC policies loaded.
    >
    > The problem is (if I understand the code correctly) that MAC calls
    > BPFD_LOCK_ASSERT, which rwatson added NET_ASSERT_GIANT to, but since the
    > sis interrupt handler is marked INTR_MPSAFE then GIANT isn't aquired
    > before bpf_mtap (and therefor mac_check_bpfdesc_receive) is called.
    >
    > I'm not really sure what the correct fix is, but if bpf is locked, is
    > GIANT really required for it?

    Are you running a main line kernel with debug.mpsafenet turned on?

    Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
    robert@fledge.watson.org Senior Research Scientist, McAfee Research

    >
    > panic: mutex Giant not owned at /data/nanobsd/src/sys/security/mac/mac_net.c:355
    > at line 729 in file /data/nanobsd/src/sys/kern/kern_mutex.c
    > Debugger("panic")
    > Stopped at Debugger+0x45: xchgl %ebx,in_Debugger.0
    > db> trace
    > Debugger(c063705f) at Debugger+0x45
    > __panic(c06363ea,2d9,c063655f,c063669a,c0646fff) at __panic+0xc7
    > _mtx_assert(c0689720,1,c0646fff,163) at _mtx_assert+0xc2
    > mac_check_bpfdesc_receive(c1995c00,c1750c00) at mac_check_bpfdesc_receive+0x40
    > bpf_mtap(c17536c0,c0adfa00) at bpf_mtap+0xa6
    > sis_start(c1750c00) at sis_start+0x1a7
    > sis_tick(c1750c00) at sis_tick+0x70
    > softclock(0) at softclock+0x176
    > ithread_loop(c0ac2500,c80c2d48,c0ac2500,c04c2e80,0) at ithread_loop+0x11c
    > fork_exit(c04c2e80,c0ac2500,c80c2d48) at fork_exit+0xa8
    > fork_trampoline() at fork_trampoline+0x8
    > --- trap 0x1, eip = 0, esp = 0xc80c2d7c, ebp = 0 ---
    >
    > --
    > Simon L. Nielsen
    > FreeBSD Documentation Team
    >

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  • Next message: Simon L. Nielsen: "Re: panic: mutex Giant not owned at src/sys/security/mac/mac_net.c:355"

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