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Message #113254
[Bug 1445273] Re: trusty amd64 kernel with bcache module panics on unregister
I am not sure... but maybe first doing the stop on the block device
attribute and then unregistering might be better.
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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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