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Message #113173
[Bug 1445273] Missing required logs.
This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:
apport-collect 1445273
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: trusty
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https://bugs.launchpad.net/bugs/1445273
Title:
trusty amd64 kernel with bcache module panics on unregister
Status in linux package in Ubuntu:
Incomplete
Bug description:
We have a system with 3 block devices (SATA) split into 2 partitions
each, and create RAID0 md0 (sda1, sdb1, sdc1), and RAID0 md1 (sda2,
sdb2, sdc2). We then create a bcache device on an SSD and set it to
writeback mode, (/dev/bcache0).
When we attempt to release/unregister the bcache device, it panics.
Here's the release script and panic.
#!/bin/bash -x
sudo su - -c "echo 1 >/sys/fs/bcache/*-*-*-*-*/unregister"
sudo su - -c "echo 1 >/sys/block/bcache0/bcache/stop"
sudo mdadm --stop /dev/md0
sudo mdadm --stop /dev/md1
for dev in sda sdb sdc; do
sudo mdadm --zero-superblock /dev/${dev}1
sudo mdadm --zero-superblock /dev/${dev}2
END="$(sudo blockdev --getsz /dev/${dev})"
GPT_END=$(($END - 100))
sudo dd if=/dev/zero of=/dev/${dev} bs=1M count=1
sudo dd if=/dev/zero of=/dev/${dev} bs=512 seek=${GPT_END}
sync
sudo blockdev --rereadpt /dev/${dev}
done
sudo wipefs -a /dev/sdd
cat /proc/partitions
[ 318.047616] BUG: unable to handle kernel NULL pointer dereference at 0000000000000a00
[ 318.055478] IP: [<ffffffffa0278280>] journal_write_unlocked+0x130/0x540 [bcache]
[ 318.062889] PGD 0
[ 318.064917] Oops: 0000 [#1] SMP
[ 318.068177] Modules linked in: btrfs raid6_pq xor ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c bcache raid0 raid1 ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core
ib_addr dm_crypt gpio_ich intel_powerclamp coretemp kvm_intel kvm joydev ioatdma i7core_edac shpchp serio_raw edac_core lpc_ich mac_hid dca overlayfs iscsi_tcp libiscsi_tcp libi
scsi scsi_transport_iscsi hid_generic e1000e usbhid ptp ahci psmouse pata_acpi hid libahci pps_core
[ 318.108586] CPU: 9 PID: 17196 Comm: kworker/9:2 Not tainted 3.13.0-49-generic #81-Ubuntu
[ 318.116669] Hardware name: Supermicro X8DTT-H/X8DTT-H, BIOS 2.1b 10/28/2011
[ 318.124147] Workqueue: events journal_write_work [bcache]
[ 318.129558] task: ffff880c1a6cc800 ti: ffff880c1b9c2000 task.ti: ffff880c1b9c2000
[ 318.137027] RIP: 0010:[<ffffffffa0278280>] [<ffffffffa0278280>] journal_write_unlocked+0x130/0x540 [bcache]
[ 318.146866] RSP: 0018:ffff880c1b9c3d90 EFLAGS: 00010202
[ 318.152170] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
[ 318.159295] RDX: ffff880604560c48 RSI: ffff88060456cad8 RDI: ffff880606c70040
[ 318.166419] RBP: ffff880c1b9c3de8 R08: 2018115b2f400000 R09: 5e80000000000000
[ 318.173542] R10: dfe776aad516cbd0 R11: 0000000000003d06 R12: 0000000000000001
[ 318.180669] R13: ffff88060456cba0 R14: ffff88060456ccc8 R15: ffff880604560000
[ 318.187801] FS: 0000000000000000(0000) GS:ffff880c3fc60000(0000) knlGS:0000000000000000
[ 318.195879] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 318.201616] CR2: 0000000000000a00 CR3: 0000000001c0e000 CR4: 00000000000007e0
[ 318.208741] Stack:
[ 318.210751] ffff88062780ac00 ffff880604560000 0000000000000000 0000000000000240
[ 318.218205] ffff880c1b9c3dc0 ffffffff81076108 ffff880604560000 ffff88060456cba0
[ 318.225657] ffff88060456cbd0 0000000000000000 0000000000000240 ffff880c1b9c3e08
[ 318.233112] Call Trace:
[ 318.235564] [<ffffffff81076108>] ? add_timer+0x18/0x20
[ 318.240790] [<ffffffffa02786e0>] journal_try_write+0x50/0x60 [bcache]
[ 318.247316] [<ffffffffa0278712>] journal_write_work+0x22/0x30 [bcache]
[ 318.253926] [<ffffffff81083a82>] process_one_work+0x182/0x450
[ 318.259757] [<ffffffff81084871>] worker_thread+0x121/0x410
[ 318.265331] [<ffffffff81084750>] ? rescuer_thread+0x430/0x430
[ 318.271166] [<ffffffff8108b5b2>] kthread+0xd2/0xf0
[ 318.276045] [<ffffffff8108b4e0>] ? kthread_create_on_node+0x1c0/0x1c0
[ 318.282571] [<ffffffff8173258c>] ret_from_fork+0x7c/0xb0
[ 318.287969] [<ffffffff8108b4e0>] ? kthread_create_on_node+0x1c0/0x1c0
[ 318.294494] Code: 00 00 e8 64 9f 0f e1 31 c0 66 41 83 bd 94 38 ff ff 00 49 8b 8d a0 40 ff ff 49 8d 97 48 0c 00 00 74 3c 66 0f 1f 84 00 00 00 00 00 <48> 8b b9 00 0a 00 00 0f b7 89 ce 00 00 00 83 c0 01 49 8b 36 48
[ 318.314445] RIP [<ffffffffa0278280>] journal_write_unlocked+0x130/0x540 [bcache]
[ 318.321943] RSP <ffff880c1b9c3d90>
[ 318.325426] CR2: 0000000000000a00
[ 318.328740] ---[ end trace 66f8467ce2b49a92 ]---
[ 318.333407] BUG: unable to handle kernel paging request at ffffffffffffffd8
[ 318.340394] IP: [<ffffffff8108bc50>] kthread_data+0x10/0x20
[ 318.345985] PGD 1c11067 PUD 1c13067 PMD 0
[ 318.350129] Oops: 0000 [#2] SMP
[ 318.353388] Modules linked in: btrfs raid6_pq xor ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c bcache raid0 raid1 ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr dm_crypt gpio_ich intel_powerclamp coretemp kvm_intel kvm joydev ioatdma i7core_edac shpchp serio_raw edac_core lpc_ich mac_hid dca overlayfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi hid_generic e1000e usbhid ptp ahci psmouse pata_acpi hid libahci pps_core
[ 318.393796] CPU: 9 PID: 17196 Comm: kworker/9:2 Tainted: G D 3.13.0-49-generic #81-Ubuntu
[ 318.402920] Hardware name: Supermicro X8DTT-H/X8DTT-H, BIOS 2.1b 10/28/2011
[ 318.410401] task: ffff880c1a6cc800 ti: ffff880c1b9c2000 task.ti: ffff880c1b9c2000
[ 318.417873] RIP: 0010:[<ffffffff8108bc50>] [<ffffffff8108bc50>] kthread_data+0x10/0x20
[ 318.425880] RSP: 0018:ffff880c1b9c39e8 EFLAGS: 00010002
[ 318.431184] RAX: 0000000000000000 RBX: 0000000000000009 RCX: 000000000000000f
[ 318.438309] RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff880c1a6cc800
[ 318.445433] RBP: ffff880c1b9c39e8 R08: 0000000000000000 R09: ffff880c3fc77bc0
[ 318.452558] R10: ffffffff8133ff6a R11: ffffea00306b0ec0 R12: ffff880c3fc734c0
[ 318.459683] R13: 0000000000000009 R14: ffff880c1a6cc7f0 R15: ffff880c1a6cc800
[ 318.466808] FS: 0000000000000000(0000) GS:ffff880c3fc60000(0000) knlGS:0000000000000000
[ 318.474893] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 318.480632] CR2: 0000000000000028 CR3: 0000000001c0e000 CR4: 00000000000007e0
[ 318.487764] Stack:
[ 318.489775] ffff880c1b9c3a00 ffffffff81084f81 ffff880c1a6cc800 ffff880c1b9c3a60
[ 318.497229] ffffffff81725cd9 ffff880c1a6cc800 ffff880c1b9c3fd8 00000000000134c0
[ 318.504683] 00000000000134c0 ffff880c1a6cc800 ffff880c1a6cce50 ffff880c1a6cc7f0
[ 318.512137] Call Trace:
[ 318.514583] [<ffffffff81084f81>] wq_worker_sleeping+0x11/0x90
[ 318.520420] [<ffffffff81725cd9>] __schedule+0x589/0x7d0
[ 318.525728] [<ffffffff81725f49>] schedule+0x29/0x70
[ 318.530697] [<ffffffff8106a16f>] do_exit+0x6df/0xa50
[ 318.535750] [<ffffffff8172b0a9>] oops_end+0xa9/0x150
[ 318.540801] [<ffffffff8171a75d>] no_context+0x27e/0x28b
[ 318.546114] [<ffffffff8171a7dd>] __bad_area_nosemaphore+0x73/0x1ca
[ 318.552379] [<ffffffff8171a947>] bad_area_nosemaphore+0x13/0x15
[ 318.558389] [<ffffffff8172da97>] __do_page_fault+0xa7/0x570
[ 318.564047] [<ffffffff8172df7a>] do_page_fault+0x1a/0x70
[ 318.569446] [<ffffffff810744e7>] ? internal_add_timer+0x17/0x40
[ 318.575453] [<ffffffff8172a3a8>] page_fault+0x28/0x30
[ 318.580599] [<ffffffffa0278280>] ? journal_write_unlocked+0x130/0x540 [bcache]
[ 318.587899] [<ffffffff81076108>] ? add_timer+0x18/0x20
[ 318.593129] [<ffffffffa02786e0>] journal_try_write+0x50/0x60 [bcache]
[ 318.599655] [<ffffffffa0278712>] journal_write_work+0x22/0x30 [bcache]
[ 318.606265] [<ffffffff81083a82>] process_one_work+0x182/0x450
[ 318.612098] [<ffffffff81084871>] worker_thread+0x121/0x410
[ 318.617671] [<ffffffff81084750>] ? rescuer_thread+0x430/0x430
[ 318.623504] [<ffffffff8108b5b2>] kthread+0xd2/0xf0
[ 318.628383] [<ffffffff8108b4e0>] ? kthread_create_on_node+0x1c0/0x1c0
[ 318.634910] [<ffffffff8173258c>] ret_from_fork+0x7c/0xb0
[ 318.640309] [<ffffffff8108b4e0>] ? kthread_create_on_node+0x1c0/0x1c0
[ 318.646832] Code: 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 48 8b 87 c0 03 00 00 55 48 89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90
[ 318.666786] RIP [<ffffffff8108bc50>] kthread_data+0x10/0x20
[ 318.672461] RSP <ffff880c1b9c39e8>
[ 318.675946] CR2: ffffffffffffffd8
[ 318.679259] ---[ end trace 66f8467ce2b49a93 ]---
[ 318.683877] Fixing recursive fault but reboot is needed!
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References
