From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Torcz Subject: btrfs not iSCSI-target safe? Date: Wed, 22 Jul 2009 13:27:06 +0200 Message-ID: <20090722112706.GA7374@mother.pipebreaker.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: linux-btrfs@vger.kernel.org Return-path: List-ID: Hi, I tried to export file from btrfs volume using iSCSI target. As soon as some initiator have read it over network, server oopsed: http://www.kerneloops.org/submitresult.php?number=557979 Kernel is Fedora's 2.6.29.6-213.fc11.x86_64. I'm aware that target iSCSI functionality is out-of-tree (I'm using iscsitarget-0.4.17-3), so it may not be safe. But is there any known incompatibility between iscsi-target and btrfs? Full oops follows: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<(null)>] (null) PGD 311fb067 PUD 31d8d067 PMD 0 Oops: 0010 [#1] SMP last sysfs file: /sys/devices/pci0000:00/0000:00:1f.1/host0/target0:0:0/0:0:0:0/block/sda/sda2/stat CPU 1 Modules linked in: iscsi_trgt fuse tun sit tunnel4 sco bridge stp llc bnep l2cap bluetooth sunrpc nf_conntrack_ftp nf_conntrack_netbios_ns ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi cpufreq_ondemand acpi_cpufreq freq_table btrfs zlib_deflate libcrc32c dm_multipath uinput ppdev dcdbas snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_timer i2c_i801 snd pcspkr serio_raw iTCO_wdt soundcore snd_page_alloc e100 iTCO_vendor_support mii parport_pc parport tg3 joydev ata_generic pata_acpi sha256_generic cbc aes_x86_64 aes_generic dm_crypt i915 drm i2c_algo_bit i2c_core video output [last unloaded: iscsi_trgt] Pid: 5278, comm: istiod1 Not tainted 2.6.29.6-213.fc11.x86_64 #1 OptiPlex GX620 RIP: 0010:[<0000000000000000>] [<(null)>] (null) RSP: 0018:ffff8800bf4e1c98 EFLAGS: 00010286 RAX: ffffffffa01e5d20 RBX: ffff8800bf4e1ca0 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffff8800bf4e1d90 RDI: ffff8800bf4e1ca0 RBP: ffff8800bf4e1dc0 R08: ffff8800bf4e0000 R09: ffff880001035d00 R10: 000000c601b64c57 R11: ffff880062489dc0 R12: ffff8800bf4e1df8 R13: ffff88003103df00 R14: ffff8800bf4e1d90 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8800dde99100(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 0000000000000000 CR3: 000000008296e000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process istiod1 (pid: 5278, threadinfo ffff8800bf4e0000, task ffff880047450000) Stack: ffffffff810d4eee ffffffff81038bc0 ffff8800626f0038 0000000000000000 ffffffff00000001 ffff88003103df00 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ffff880047450000 0000000000000000 Call Trace: [] ? do_sync_write+0xe8/0x125 [] ? wakeup_preempt_entity+0x3d/0x49 [] ? autoremove_wake_function+0x0/0x39 [] ? __dequeue_entity+0x33/0x38 [] fileio_make_request+0x14b/0x1dd [iscsi_trgt] [] tio_write+0x4f/0x51 [iscsi_trgt] [] build_write_response+0x97/0xb5 [iscsi_trgt] [] send_scsi_rsp+0x15/0xaf [iscsi_trgt] [] disk_execute_cmnd+0x171/0x19b [iscsi_trgt] [] worker_thread+0xb5/0x183 [iscsi_trgt] [] ? default_wake_function+0x0/0x14 [] ? worker_thread+0x0/0x183 [iscsi_trgt] [] kthread+0x4d/0x78 [] child_rip+0xa/0x20 [] ? restore_args+0x0/0x30 [] ? kthread+0x0/0x78 [] ? child_rip+0x0/0x20 Code: Bad RIP value. RIP [<(null)>] (null) RSP CR2: 0000000000000000 ---[ end trace 9e41df932c81a801 ]--- -- Tomasz Torcz "Never underestimate the bandwidth of a station xmpp: zdzichubg@chrome.pl wagon filled with backup tapes." -- Jim Gray