Re: kern/47739

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

The following reply was made to PR kern/47739; it has been noted by GNATS.

From: Patrick Welche <prlw1%cam.ac.uk@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/47739
Date: Wed, 8 May 2013 11:30:25 +0100

 Just got a working core file:               
                                            
 (gdb) bt                                     
 #0  0xffffffff804e40de in cpu_reboot (howto=260, bootstr=<optimized out>)
     at ../../../../arch/amd64/amd64/machdep.c:705
 #1  0xffffffff80696bad in vpanic (            
     fmt=0xffffffff8096f688 "kernel %sassertion \"%s\" failed: file \"%s\", 
line 
 +%d ", ap=0xfffffe811b1769d0) at ../../../../kern/subr_prf.c:284
 #2  0xffffffff80834368 in kern_assert (fmt=<unavailable>)
     at ../../../../../../lib/libkern/kern_assert.c:50
 #3  0xffffffff806de80c in VP_TO_TMPFS_DIR (vp=<optimized out>)
     at ../../../../fs/tmpfs/tmpfs.h:357        
 #4  tmpfs_readdir (v=<optimized out>) at 
../../../../fs/tmpfs/tmpfs_vnops.c:938 
 #5  0xffffffff807daa33 in VOP_READDIR (vp=0xfffffe81591b9be8,
     uio=<optimized out>, cred=<optimized out>, eofflag=<optimized out>,
     cookies=<optimized out>, ncookies=<optimized out>)  
     at ../../../../kern/vnode_if.c:952               
 #6  0xffffffff807c507b in vn_readdir (fp=0xfffffe811bc1c940,
     bf=0x7f7ff770b000 <Address 0x7f7ff770b000 out of bounds>, segflg=0,
     count=<optimized out>, done=0xfffffe811b176bec, l=0xfffffe81105f3040,
     cookies=0x0, ncookies=0x0) at ../../../../kern/vfs_vnops.c:470
     count=<optimized out>, done=0xfffffe811b176bec, l=0xfffffe81105f3040,
     cookies=0x0, ncookies=0x0) at ../../../../kern/vfs_vnops.c:470
 #7  0xffffffff807c07c1 in sys___getdents30 (l=0xfffffe81105f3040,
     uap=0xfffffe811b176c80, retval=0xfffffe811b176c30)
     at ../../../../kern/vfs_syscalls.c:4611             
 #8  0xffffffff806affe4 in sy_call (rval=0xfffffe811b176c30,
     uap=0xfffffe811b176c80, l=0xfffffe81105f3040, sy=0xffffffff80c99460)
 
 dmesg is full of
 
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0
 WARNING: SPL NOT LOWERED ON SYSCALL 16445 -151703264 EXIT 0 7
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0   
 ...
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0
 sys___getdents30() at netbsd:sys___getdents30+0x76
 WARNING: SPL NOT LOWERED ON SYSCALL 24678 -1 EXIT f7b2b400 6
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0
 WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0 
 ...
 
 (gdb) frame 3
 #3  0xffffffff806de80c in VP_TO_TMPFS_DIR (vp=<optimized out>)
     at ../../../../fs/tmpfs/tmpfs.h:357
 357             TMPFS_VALIDATE_DIR(node);
 (gdb) list
 352     VP_TO_TMPFS_DIR(vnode_t *vp)
 353     {
 354             tmpfs_node_t *node = vp->v_data;
 355
 356             KASSERT(node != NULL);
 357             TMPFS_VALIDATE_DIR(node);
 358             return node;
 359     }
 360
 361     #endif /* defined(_KERNEL) */
 (gdb) frame 5
 #5  0xffffffff807daa33 in VOP_READDIR (vp=0xfffffe81591b9be8, 
     uio=<optimized out>, cred=<optimized out>, eofflag=<optimized out>, 
     cookies=<optimized out>, ncookies=<optimized out>)
     at ../../../../kern/vnode_if.c:952
 952             error = (VCALL(vp, VOFFSET(vop_readdir), &a));
 (gdb) list
 947             a.a_eofflag = eofflag;
 948             a.a_cookies = cookies;
 949             a.a_ncookies = ncookies;
 950             mpsafe = (vp->v_vflag & VV_MPSAFE);
 951             if (!mpsafe) { KERNEL_LOCK(1, curlwp); }
 952             error = (VCALL(vp, VOFFSET(vop_readdir), &a));
 953             if (!mpsafe) { KERNEL_UNLOCK_ONE(curlwp); }
 954             return error;
 955     }
 956
 (gdb) print *vp
 $1 = {v_uobj = {vmobjlock = 0xfffffe8197f5fac0, pgops = 0xffffffff80957c80, 
     memq = {tqh_first = 0x0, tqh_last = 0xfffffe81591b9bf8}, uo_npages = 0, 
     uo_refs = 1, rb_tree = {rbt_root = 0x0, rbt_ops = 0xffffffff80957a60, 
       rbt_minmax = {0x0, 0x0}}, uo_ubc = {lh_first = 0x0}}, v_cv = {
     cv_opaque = {0x0, 0xfffffe81591b9c38, 0xffffffff809d8ec4}}, 
   v_size = 16720, v_writesize = 16720, v_iflag = 0, v_vflag = 16, v_uflag = 0, 
   v_numoutput = 0, v_writecount = 0, v_holdcnt = 0, v_synclist_slot = 0, 
   v_mount = 0xfffffe8110c43008, v_op = 0xfffffe821db1a748, v_freelist = {
     tqe_next = 0xfffffe8198503148, tqe_prev = 0xfffffe81985037b8}, 
   v_freelisthd = 0x0, v_mntvnodes = {tqe_next = 0xfffffe81591b9620, 
     tqe_prev = 0xfffffe81591b9dd0}, v_cleanblkhd = {lh_first = 0x0}, 
   v_dirtyblkhd = {lh_first = 0x0}, v_synclist = {tqe_next = 0x0, 
     tqe_prev = 0x0}, v_dnclist = {lh_first = 0xfffffe81386c0c00}, v_nclist = {
     lh_first = 0xfffffe813d1b3e40}, v_un = {vu_mountedhere = 0x0, 
     vu_socket = 0x0, vu_specnode = 0x0, vu_fifoinfo = 0x0, vu_ractx = 0x0}, 
   v_type = VDIR, v_tag = VT_TMPFS, v_lock = {rw_owner = 64}, 
   v_data = 0xfffffe81face0660, v_klist = {slh_first = 0x0}}
 
 so v_data is not 0 here...
 
 frame 4, vp is already optimized out...