Hi Trond, When open fails and should return EPERM [1], instead we see an oops [2]. I see this on 2.6.34-rc1 and -rc2 mainline; NFS4 server is mainline 2.6.33.1. Let me know if you can't reproduce it and I'll provide some analysis from this end. Thanks, Daniel --- [1] $ touch /tmp/foo $ sudo chmod 0 /tmp/foo $ cat /tmp/foo cat: /tmp/foo: Permission denied $ touch /net/users/daniel/foo $ sudo chmod 0 /net/users/daniel/foo $ cat /net/users/daniel/foo Killed --- [2] BUG: unable to handle kernel NULL pointer dereference at 000000000000000b IP: [<ffffffff8115036e>] nameidata_to_filp+0x1e/0x70 PGD 840d3067 PUD 841eb067 PMD 0 Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map CPU 4 Modules linked in: usb_storage nls_iso8859_1 nls_cp437 vfat fat binfmt_misc rfcomm sco bnep l2cap kvm_intel kvm microcode btusb bluetooth arc4 ecb uvcvideo iwlagn videodev iwlcore v4l1_compat v4l2_compat_ioctl32 mac80211 Pid: 20644, comm: perf Tainted: G W 2.6.34-rc2-317cd #2 0KM426/Studio 1557 RIP: 0010:[<ffffffff8115036e>] [<ffffffff8115036e>] nameidata_to_filp+0x1e/0x70 RSP: 0018:ffff88008fd31d38 EFLAGS: 00010292 RAX: ffff88012c1825a0 RBX: fffffffffffffff3 RCX: 0000000000000041 RDX: 0000000000008000 RSI: 0000000000000024 RDI: ffff88008fd31e18 RBP: ffff88008fd31d48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88012f8c3180 FS: 00007fd781585700(0000) GS:ffff880010800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 000000000000000b CR3: 00000000842a3000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process perf (pid: 20644, threadinfo ffff88008fd30000, task ffff88012c1825a0) Stack: ffff88008fd31e18 ffff88008fd31e18 ffff88008fd31da8 ffffffff8115e7f8 <0> ffff88008fd31d88 ffffffff81301018 ffff88012a121500 000000242a121500 <0> ffff88013250b6c0 ffff88008fd31e18 0000000000000000 ffff88012f8c3180 Call Trace: [<ffffffff8115e7f8>] do_last+0x348/0x740 [<ffffffff81301018>] ? __raw_spin_lock_init+0x38/0x70 [<ffffffff81160de9>] do_filp_open+0x219/0x690 [<ffffffff816e59b9>] ? sub_preempt_count+0xa9/0xe0 [<ffffffff8116c912>] ? alloc_fd+0x132/0x1b0 [<ffffffff8114fcd9>] do_sys_open+0x69/0x140 [<ffffffff816e0d92>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff8114fdf0>] sys_open+0x20/0x30 [<ffffffff81003172>] system_call_fastpath+0x16/0x1b Code: cc 58 00 48 c7 c0 ea ff ff ff eb 82 90 55 48 89 e5 53 48 83 ec 08 0f 1f 44 00 00 48 8b 9f 90 00 00 00 65 48 8b 04 25 40 b5 00 00 <48> 83 7b 18 00 4c 8b 80 18 06 00 00 74 14 e8 2f c4 00 00 48 89 RIP [<ffffffff8115036e>] nameidata_to_filp+0x1e/0x70 RSP <ffff88008fd31d38> CR2: 000000000000000b ---[ end trace 525ed01cba1a212e ]--- -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
