Thomas/Peter,
I got the below backtrace while running the 'mock' unit-tests (most of
which make heavy use of tmpfs). Basically it's creating a chroot
build environment for a particular distro (in this case
fedora-12-x86_64) and building a source RPM inside that chroot.
I'm running 2.6.33.4-rt19 from tip/rt/2.6.33
Clark
BUG: Dentry ffff880053401928{i=1ef806,n=ptmx} still in use (-1)
[unmount of tmpfs tmpfs] ------------[ cut here ]------------
kernel BUG at fs/dcache.c:835!
invalid opcode: 0000 [#1] PREEMPT SMP
last sysfs
file: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C09:00/PNP0C0A:00/power_supply/BAT0/status
CPU 0 Pid: 14563, comm: umount Not tainted 2.6.33.4-rt19
#36 / RIP: 0010:[<ffffffff81107f12>] [<ffffffff81107f12>]
shrink_dcache_for_umount_subtree+0x119/0x253 RSP:
0018:ffff880080073da8 EFLAGS: 00010292 RAX: 000000000000005f RBX:
ffff880053401928 RCX: 0000000000000000 RDX: 0000000000000000 RSI:
0000000000000046 RDI: ffff880080073c88 RBP: ffff880080073de8 R08:
ffff88009823c000 R09: 0000000000000073 R10: 0000000000000000 R11:
0000000000000000 R12: ffff880011f7ad18 R13: ffff8800534019c8 R14:
ffff880011f7ad10 R15: ffff8800b4bb6e08 FS: 00007f62035d4740(0000)
GS:ffff88000a200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES:
0000 CR0: 000000008005003b CR2: 00007f6202c9b488 CR3: 0000000076b36000
CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400 Process umount (pid: 14563, threadinfo
ffff880080072000, task ffff88003d6da5c0) Stack:
ffff88004329b2f0 0000000000000000 ffff88003d6da5c0 ffff880037ddeb18
<0> ffff88004329b000 ffff880037ddeb20 ffffffff81af26d0 ffff880080073fd8
<0> ffff880080073e18 ffffffff81108092 ffff880037ddeb20 ffff88004329b000
Call Trace:
[<ffffffff81108092>] shrink_dcache_for_umount+0x46/0x5b
[<ffffffff810f824f>] generic_shutdown_super+0x1f/0xf9
[<ffffffff810f837e>] kill_anon_super+0x16/0x54
[<ffffffff810f83e3>] kill_litter_super+0x27/0x2b
[<ffffffff810f8aab>] deactivate_super+0x6d/0x82
[<ffffffff8110eadb>] mntput_no_expire+0x1a5/0x218
[<ffffffff8110f0f5>] sys_umount+0x2d5/0x300
[<ffffffff8108af27>] ? audit_syscall_entry+0x1ec/0x218
[<ffffffff81002c1b>] system_call_fastpath+0x16/0x1b
Code: 0a 48 8b 4b 70 31 d2 48 85 f6 74 04 48 8b 56 40 48 05 f0 02 00 00
48 89 de 48 89 04 24 48 c7 c7 6f 9a 78 81 31 c0 e8 93 be 32 00 <0f> 0b
eb fe 4c 8b 63 60 4c 39 e3 75 3c 48 8b 93 90 00 00 00 48 RIP
[<ffffffff81107f12>] shrink_dcache_for_umount_subtree+0x119/0x253 RSP
<ffff880080073da8> ---[ end trace 34e97e0ec2c5ae6a ]---
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