Re: panic in get_next_dirent

on 02/09/2010 13:01 Andriy Gapon said the following:
> 
> Brian,
> 
> after I upgraded my kernel from beginning of July version to end of August
> version I started to get panics in get_next_dirent under parallel FS load, like
> e.g. during buildworld with -jN.
> 
> Is this something that might have been broken by accident and then fixed later?
> I've seen that you were making some changes in the related code while working on
> your NFS problem.
> 
> I am upgrading kernel to the latest version now to see if that helps.
>

Update to r212138 seems to have helped.
Sorry if my report is useless.

> Here is panic information:
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 1; apic id = 01
> fault virtual address   = 0xffffff80151b8abb
> fault code              = supervisor read data, page not present
> instruction pointer     = 0x20:0xffffffff803f6f54
> stack pointer           = 0x28:0xffffff8124353580
> frame pointer           = 0x28:0xffffff8124353650
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 12295 (sh)
> trap number             = 12
> panic: page fault
> cpuid = 1
> KDB: stack backtrace:
> db_trace_self_wrapper() at 0xffffffff801b84ba = db_trace_self_wrapper+0x2a
> kdb_backtrace() at 0xffffffff803a2c62 = kdb_backtrace+0x32
> panic() at 0xffffffff8036cb54 = panic+0x1b4
> trap_fatal() at 0xffffffff805471ad = trap_fatal+0x39d
> trap_pfault() at 0xffffffff805473bd = trap_pfault+0x1ed
> trap() at 0xffffffff805479a4 = trap+0x484
> calltrap() at 0xffffffff80531428 = calltrap+0x8
> --- trap 0xc, rip = 0xffffffff803f6f54, rsp = 0xffffff8124353580, rbp =
> 0xffffff8124353650 ---
> get_next_dirent() at 0xffffffff803f6f54 = get_next_dirent+0x164
> vop_stdvptocnp() at 0xffffffff803f749a = vop_stdvptocnp+0x31a
> VOP_VPTOCNP_APV() at 0xffffffff805a3af8 = VOP_VPTOCNP_APV+0xe8
> vn_vptocnp_locked() at 0xffffffff803f339c = vn_vptocnp_locked+0x1fc
> vn_fullpath1() at 0xffffffff803f36b8 = vn_fullpath1+0x1e8
> kern___getcwd() at 0xffffffff803f3b4a = kern___getcwd+0xda
> __getcwd() at 0xffffffff803f3cd4 = __getcwd+0x14
> syscallenter() at 0xffffffff803b088e = syscallenter+0x26e
> syscall() at 0xffffffff80547432 = syscall+0x42
> Xfast_syscall() at 0xffffffff80531702 = Xfast_syscall+0xe2
> --- syscall (326, FreeBSD ELF64, __getcwd), rip = 0x800939cfc, rsp =
> 0x7fffffffe0b8, rbp = 0x800c2a208 ---
> 


-- 
Andriy Gapon