Re: 8.0-CURRENT kernel panic on system boot

From: kevin <kevinxlinuz_at_163.com>
Date: Thu, 21 Aug 2008 22:15:46 +0800
Kostik Belousov wrote:
> On Thu, Aug 21, 2008 at 09:33:55PM +0800, kevin wrote:
>   
>> Hi,
>>    I update to the newest source tree and rebuild kernel(with zfs 
>> patch).kernel panic on system startup.Should I rebuild world?
>> ......
>> Starting gdm.
>> Sleeping thread (tid 100068,pid 1145) owns a non-sleepable lock
>> sched_switch() at sched_switch+0x184
>> mi_switch() at mi_switch+0x21b
>> sleepq_switch() at sleepq_switch+0xfa
>> sleepq_wait() at sleepq_wait+0x46
>> _sx_slock_hard() at _sx_slock_hard+0x169
>> _sx_slock() at _sx_slock+0x6b
>> acct_process() at acct_process+0x24b
>> exit1() at exit1+0x3e8
>> sys_exit() at sys_exit+0xe
>> syscall() at syscall+0x1dd
>> Xfast_syscall() at Xfast_syscall+0xab
>> --- syscall (1, FreeBSD ELF64, sys_exit), rip = 0x80094dd0c, rsp = 
>> 0x7fffffffcdf8, rbp = 0x62d548 ---
>> panic: sleeping thread
>> cpuid = 0
>> KDB: enter: panic
>> [thread pid 1143 tid 100127 ]
>> Stopped at       kdb_enter+0x3d: movq    $0,0x6cebb4(%rip)
>> db>bt
>> Tracing pid 1143 tid 100127 td 0xfffff000f073700
>> kdb_enter() at kdb_enter()+0x3d
>> panic() at panic()+0x16c
>> propagate_priority() propagate_priority+0x221
>> turnstile_wait() at turnstile_wait+0x212
>> _mtx_lock_sleep() at _mtx_lock_sleep+0xe0
>> _mtx_lock_flags() at _mtx_lock_flags+0xc0
>> kern_wait() at kern_wait+0x11b
>> wait4() at wait4+0x33
>> syscall() at syscall()+0x1dd
>> Xfast_syscall() at Xfast_syscall()+0xab
>> --- syscall (7, FreeBSD ELF64, wait4), rip = 0x8009115c, rsp = 
>> 0x7fffffffcf18, rbp = 0x26 ---
>> db>show locks
>> exclusive sx proctree (proctree) r = 0 (0xffffffff8099fc80) locked 
>> _at_/usr/src/sys/kern/kern_exit.c:702
>> db>show allpcpu
>> Current CPU:0
>> cpuid   = 0
>> curthread =0xffffff000f073700:pid 1143 "sh"
>> curpcb    =0xfffffffea6084d40
>> fpcurthread  = none
>> idlethread  = 0xffffff0002395380:pid 11 "idle: cpu0"
>> spin locks held:
>>
>> cpuid   = 1
>> curthread =0xffffff0002395700:pid 1143 "idle: cpu1"
>> curpcb    =0xfffffffe4001dd40
>> fpcurthread  = none
>> idlethread  = 0xffffff0002395700:pid 11 "idle: cpu1"
>> spin locks held:
>>
>>     
>
> No, this is a consequence of taking sx after proc lock in kern_acct.c,
> acct_process(). You may turn off accounting, or try this patch:
>
> diff --git a/sys/kern/kern_acct.c b/sys/kern/kern_acct.c
> index e505f62..d45e3b7 100644
> --- a/sys/kern/kern_acct.c
> +++ b/sys/kern/kern_acct.c
> _at__at_ -366,16 +366,25 _at__at_ acct_process(struct thread *td)
>  	 * Get process accounting information.
>  	 */
>  
> +	sx_slock(&proctree_lock);
>  	PROC_LOCK(p);
> -	/* (1) The name of the command that ran */
> +
> +	/* (1) The terminal from which the process was started */
> +	if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
> +		acct.ac_tty = tty_udev(p->p_pgrp->pg_session->s_ttyp);
> +	else
> +		acct.ac_tty = NODEV;
> +	sx_sunlock(&proctree_lock);
> +
> +	/* (2) The name of the command that ran */
>  	bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm);
>  
> -	/* (2) The amount of user and system time that was used */
> +	/* (3) The amount of user and system time that was used */
>  	rufetchcalc(p, &ru, &ut, &st);
>  	acct.ac_utime = encode_timeval(ut);
>  	acct.ac_stime = encode_timeval(st);
>  
> -	/* (3) The elapsed time the command ran (and its starting time) */
> +	/* (4) The elapsed time the command ran (and its starting time) */
>  	tmp = boottime;
>  	timevaladd(&tmp, &p->p_stats->p_start);
>  	acct.ac_btime = tmp.tv_sec;
> _at__at_ -383,7 +392,7 _at__at_ acct_process(struct thread *td)
>  	timevalsub(&tmp, &p->p_stats->p_start);
>  	acct.ac_etime = encode_timeval(tmp);
>  
> -	/* (4) The average amount of memory used */
> +	/* (5) The average amount of memory used */
>  	tmp = ut;
>  	timevaladd(&tmp, &st);
>  	/* Convert tmp (i.e. u + s) into hz units to match ru_i*. */
> _at__at_ -394,21 +403,13 _at__at_ acct_process(struct thread *td)
>  	else
>  		acct.ac_mem = 0;
>  
> -	/* (5) The number of disk I/O operations done */
> +	/* (6) The number of disk I/O operations done */
>  	acct.ac_io = encode_long(ru.ru_inblock + ru.ru_oublock);
>  
> -	/* (6) The UID and GID of the process */
> +	/* (7) The UID and GID of the process */
>  	acct.ac_uid = p->p_ucred->cr_ruid;
>  	acct.ac_gid = p->p_ucred->cr_rgid;
>  
> -	/* (7) The terminal from which the process was started */
> -	sx_slock(&proctree_lock);
> -	if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
> -		acct.ac_tty = tty_udev(p->p_pgrp->pg_session->s_ttyp);
> -	else
> -		acct.ac_tty = NODEV;
> -	sx_sunlock(&proctree_lock);
> -
>  	/* (8) The boolean flags that tell how the process terminated, etc. */
>  	acct.ac_flagx = p->p_acflag;
>  	PROC_UNLOCK(p);
>   
Thanks. After I turned off accounting in /etc/rc.conf. It works.
Received on Thu Aug 21 2008 - 12:16:11 UTC

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