Re: panic: Duplicate free of item 0xffffff005c4a8600 from zone0xffffff007fed4780(Mbuf)

On Sun, 18 Jul 2004, Willem Jan Withagen wrote:

> > Three stikes and out....
> > I'll disable mpsafe now....
> 
> Does not seem to help....  Not shure if anything should be read in the
> fact that it is 3 times in [thread 100007]. 

Well, the threads involved seem to be the netisr thread and the bge
interrupt thread, suggesting we have a problem with mbufs being free'd
despite being handed off into the network stack.  Up front, it suggests
maybe we have an issue with the bge driver freeing or reusing an mbuf
inappropriately, or perhaps it's at the TCP layer.

Thanks,

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert_at_fledge.watson.org      Principal Research Scientist, McAfee Research


> 
> --WjW
> 
> 
> panic: Duplicate free of item 0xffffff00614fb800 from zone 0xffffff007fed
> 4780(Mbuf)
> 
> cpuid = 1;
> KDB: stack backtrace:
> kdb_backtrace() at kdb_backtrace+0x34
> panic() at panic+0x1d2
> uma_dbg_free() at uma_dbg_free+0x112
> uma_zfree_arg() at uma_zfree_arg+0x10a
> mb_free_ext() at mb_free_ext+0x96
> m_freem() at m_freem+0x28
> ether_demux() at ether_demux+0x341
> ether_input() at ether_input+0x247
> bge_rxeof() at bge_rxeof+0x36b
> bge_intr() at bge_intr+0x15a
> ithread_loop() at ithread_loop+0x18d
> fork_exit() at fork_exit+0xc9
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffffffb0b7cd00, rbp = 0 ---
> KDB: enter: panic
> [thread 100007]
> Stopped at      kdb_enter+0x2e: nop
> 
> And:
> 
> Slab at 0xffffff00612d7fb8, freei 3 = 0.
> panic: Duplicate free of item 0xffffff00612d7300 from zone
> 0xffffff007fed4780(Mbuf)
> 
> cpuid = 1;
> KDB: stack backtrace:
> kdb_backtrace() at kdb_backtrace+0x34
> panic() at panic+0x1d2
> uma_dbg_free() at uma_dbg_free+0x112
> uma_zfree_arg() at uma_zfree_arg+0x10a
> mb_free_ext() at mb_free_ext+0x96
> m_freem() at m_freem+0x28
> tcp_input() at tcp_input+0x2b24
> ip_input() at ip_input+0x94c
> netisr_processqueue() at netisr_processqueue+0x8c
> swi_net() at swi_net+0xaf
> ithread_loop() at ithread_loop+0x18d
> fork_exit() at fork_exit+0xc9
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffffffb0bb5d00, rbp = 0 ---
> KDB: enter: panic
> [thread 100017]
> Stopped at      kdb_enter+0x2e: nop
> 
> And:
> Slab at 0xffffff005926ffb8, freei 13 = 0.
> panic: Duplicate free of item 0xffffff005926fd00 from zone 0xffffff007fed4780(Mb
> uf)
> 
> cpuid = 1;
> KDB: stack backtrace:
> kdb_backtrace() at kdb_backtrace+0x34
> panic() at panic+0x1d2
> uma_dbg_free() at uma_dbg_free+0x112
> uma_zfree_arg() at uma_zfree_arg+0x10a
> mb_free_ext() at mb_free_ext+0x96
> m_freem() at m_freem+0x28
> ether_demux() at ether_demux+0x341
> ether_input() at ether_input+0x247
> bge_rxeof() at bge_rxeof+0x36b
> bge_intr() at bge_intr+0x15a
> ithread_loop() at ithread_loop+0x18d
> fork_exit() at fork_exit+0xc9
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffffffb0b7cd00, rbp = 0 ---
> KDB: enter: panic
> [thread 100007]
> Stopped at      kdb_enter+0x2e: nop
> 
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