Date: Wed, 21 Dec 2005 12:07:06 -0800 From: Sam Leffler <sam@errno.com> To: Andrea Campi <andrea+freebsd_current@webcom.it> Cc: current@freebsd.org Subject: Re: Panic and LOR on -CURRENT with ath Message-ID: <43A9B5EA.8030905@errno.com> In-Reply-To: <20051221191919.GB17950@webcom.it> References: <20051221191919.GB17950@webcom.it>
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Andrea Campi wrote: > Hi, > > I have a Soekris box working as router/firewall/access point for my LAN, and > after my latest update (a few days ago) I've been having a couple of issues: > a LOR at boot, and a panic after some variable amount of time. I sort of > remember seeing something similar to the panic on a mailing list, but can't > find the thread. > > Since they appear regularly, if there's anything I can do to help debug the > issue I'm all ears. > > Bye, > Andrea > > > lock order reversal: (sleepable after non-sleepable) > 1st 0xc0d68d30 ath0 (network driver) @ /usr/src/sys/dev/ath/if_ath.c:4642 > 2nd 0xc0cfc878 user map (user map) @ /usr/src/sys/vm/vm_map.c:2997 > KDB: stack backtrace: > witness_checkorder(c0cfc878,9,c05fed2f,bb5,c5b7c924) at witness_checkorder+0x383 > _sx_xlock(c0cfc878,c05fed2f,bb5,2b7c928,c5b7c924) at _sx_xlock+0x3c > vm_map_lookup(c5b7c924,805e000,2,c5b7c928,c5b7c918,c5b7c91c,c5b7c8ff,c5b7c900) a > t vm_map_lookup+0x30 > vm_fault(c0cfc834,805e000,2,8,c0d5e900) at vm_fault+0x63 > trap_pfault(805e000) at trap_pfault+0x10b > trap(8,c0640028,c0d50028,805e000,c0da8e00) at trap+0x34a > calltrap() at calltrap+0x5 > --- trap 0xc, eip = 0xc05c0316, esp = 0xc5b7ca2c, ebp = 0xc5b7ca60 --- > generic_copyout(c0d65000,c0d90980,c0d68aac,c0286938,0) at generic_copyout+0x36 > ieee80211_ioctl(c0d681ac,c0286938,c0d90980) at ieee80211_ioctl+0x16a > ath_ioctl(c0d65000,c0286938,c0d90980) at ath_ioctl+0xb2 > ifhwioctl(c0d90980,c0d5e900,c0d65000,c0fd7590,c0286938) at ifhwioctl+0x1fd > ifioctl(c0fd7590,c0286938,c0d90980,c0d5e900) at ifioctl+0x5c > soo_ioctl(c0de75e8,c0286938,c0d90980,c0ce6d80,c0d5e900) at soo_ioctl+0x29d > ioctl(c0d5e900,c5b7cd04,3,13,206) at ioctl+0xfa > syscall(3b,3b,3b,805d028,805d000) at syscall+0x110 > Xint0x80_syscall() at Xint0x80_syscall+0x1f This is a driver lock held across an ioctl that does copyout and the destination faults. I've tried to get people to buy into a solution to the general problem w/o luck. > --- syscall (54, FreeBSD ELF32, ioctl), eip = 0x2813f69f, esp =fe5d8 --- > > > > Fatal trap 12: page fault while in kernel mode > fault virtual address = 0xdeadc0de > fault code = supervisor read, page not present > instruction pointer = 0x20:0xc04dccc9 > stack pointer = 0x28:0xc5705c10 > frame pointer = 0x28:0xc5705c18 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 31 (swi6: task queue) > [thread pid 31 tid 100018 ] > Stopped at m_tag_delete_chain+0x29: movl 0(%ebx),%eax > db> bt > Tracing pid 31 tid 100018 td 0xc0cf3780 > m_tag_delete_chain(c103fb00,0,deadc0de,c5705c58,c057bc61) at m_tag_delete_chain+ > 0x29 > mb_dtor_mbuf(c103fb00,100,0) at mb_dtor_mbuf+0x38 > uma_zfree_arg(c0872e80,c103fb00,0) at uma_zfree_arg+0x2f1 > m_freem(c103fb00,c0d69188,0,c0fd2000,c5baa588) at m_freem+0x4e > ath_tx_processq(1,c0d6940c,c5705ce8,c04c1e51,c0d68000) at ath_tx_processq+0x109 > ath_tx_proc_q0123(c0d68000,1,c0ce779c,0,c05eea3e) at ath_tx_proc_q0123+0x24 > taskqueue_run(c0ce7780,0,c0d0e830,0,c048ff00) at taskqueue_run+0x81 > ithread_loop(c0ce7700,c5705d38,c0ce7700,c048ff00,0) at ithread_loop+0x175 > fork_exit(c048ff00,c0ce7700,c5705d38) at fork_exit+0x83 > fork_trampoline() at fork_trampoline+0x8 > --- trap 0x1, eip = 0, esp = 0xc5705d6c, ebp = 0 --- It appears the mbuf was reclaimed while sitting on the tx queue waiting to be reaped. I've seen a few complaints of this sort but never enough info to start looking. This problem seems to be common to soekris h/w or perhaps this general config which is common on soekris h/w. Knowing the configuration might be useful; e.g. bridged config? what packet filter package? network setup? Sam
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