is -1 really too "large" ?

got today :

run trinity at Mon Oct 21 20:38:27 CEST 2013 28#-1 M=/mnt/nfsv4

rm: cannot remove '/mnt/nfsv4/victims/v1/v2/.nfs0000000000004924000000cb': Device or resource busy
rm: cannot remove '/mnt/nfsv4/victims/v1/v2/.nfs0000000000003fdd000000a9': Device or resource busy
rm: cannot remove '/mnt/nfsv4/victims/v1/v2/.nfs00000000000034230000007a': Device or resource busy
rm: cannot remove '/mnt/nfsv4/victims/v1/v2/.nfs0000000000002d320000006b': Device or resource busy
rm: cannot remove '/mnt/nfsv4/victims/v1/v2/.nfs0000000000001a7c00000035': Device or resource busy
rm: cannot remove '/mnt/nfsv4/victims/v1/v2/.nfs00000000000017600000002a': Device or resource busy Trinity v1.3pre Dave Jones <[email protected]>
Done parsing arguments.
Marking all syscalls as enabled.
[init] Enabled 351 syscalls. Disabled 0 syscalls.
[init] Using pid_max = 32768
[init] Started watchdog process, PID is 15311
[main] Main thread is alive.
[main] Generating file descriptors
[main] Something went wrong during nftw(/mnt/nfsv4/victims/v1/v2). (-1:Value too large for defined data type) [child2:15315] iopl (110) returned ENOSYS, marking as inactive.
[child2:15315] acct (51) returned ENOSYS, marking as inactive.
[child2:15315] perf_event_open (336) returned ENOSYS, marking as inactive.
...

MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

So NFS returned -EOVERFLOW. Not sure why it would do that, but I'm goingto guess it came from nftw internally doing an lseek. lseek's man page suggests..

EOVERFLOW
The resulting file offset cannot be represented in an off_t.

64bit server and 32 bit client perhaps ?

Dave

I do only run 32 bit Gentoo Linux (both at host and as user mode linux client).

FWIW in this particular test case I run both an NFS service and a NFS client software at the same UML image do find a reliable rest case to reproduce this hang/cpu burner of one of the linux processes at the host :

tfoerste@n22 ~ $ sudo gdb /home/tfoerste/devel/linux/linux 23921 -n -batch -ex bt 0x08298edc in radix_tree_next_chunk (root=0x14, iter=0x46cc7c60, flags=12) at lib/radix-tree.c:770
770 if (node->slots[offset])

#0  0x08298edc in radix_tree_next_chunk (root=0x14, iter=0x46cc7c60, flags=12) at lib/radix-tree.c:770
#1  0x080cc11e in find_get_pages (mapping=0x46ef9b00, start=0, nr_pages=14, pages=0xc) at mm/filemap.c:844
#2  0x080d5c8a in pagevec_lookup (pvec=0x46cc7cc4, mapping=0x14, start=20, nr_pages=20) at mm/swap.c:914
#3  0x080d607a in truncate_inode_pages_range (mapping=0x46ef9b00, lstart=0, lend=-1) at mm/truncate.c:241
#4  0x080d641f in truncate_inode_pages (mapping=0x14, lstart=51539607572) at mm/truncate.c:358
#5  0x08260818 in hostfs_evict_inode (inode=0x46ef9a48) at fs/hostfs/hostfs_kern.c:242
#6  0x0811a8af in evict (inode=0x46ef9a48) at fs/inode.c:549
#7  0x0811b28d in iput_final (inode=<optimized out>) at fs/inode.c:1391
#8  iput (inode=0x46ef9a48) at fs/inode.c:1409
#9  0x08117628 in dentry_iput (dentry=<optimized out>) at fs/dcache.c:331

#10 d_kill (dentry=0x4915d6e0, parent=0x49171dc0) at fs/dcache.c:477
#11 0x08118048 in dentry_kill (dentry=<optimized out>, unlock_on_failure=<optimized out>) at fs/dcache.c:586
#12 dput (dentry=0x4915d6e0) at fs/dcache.c:641
#13 0x081048e3 in __fput (file=0x46cfe900) at fs/file_table.c:264
#14 0x0810494b in ____fput (work=0x46cfe900) at fs/file_table.c:282
#15 0x08094496 in task_work_run () at kernel/task_work.c:123
#16 0x0807efd2 in exit_task_work (task=<optimized out>) at include/linux/task_work.h:21
#17 do_exit (code=1213106688) at kernel/exit.c:787
#18 0x0807f5dd in do_group_exit (exit_code=0) at kernel/exit.c:920
#19 0x0807f649 in SYSC_exit_group (error_code=<optimized out>) at kernel/exit.c:931
#20 SyS_exit_group (error_code=0) at kernel/exit.c:929
#21 0x08062984 in handle_syscall (r=0x46f493d4) at arch/um/kernel/skas/syscall.c:35
#22 0x08074fb5 in handle_trap (local_using_sysemu=<optimized out>, regs=<optimized out>, pid=<optimized out>) at arch/um/os-Linux/skas/process.c:198 #23 userspace (regs=0x46f493d4) at arch/um/os-Linux/skas/process.c:431
#24 0x0805f750 in fork_handler () at arch/um/kernel/process.c:160
#25 0x5a5a5a5a in ?? ()

MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3