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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1737817
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: artful
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https://bugs.launchpad.net/bugs/1737817
Title:
artful bcache NULL pointer defererence
Status in linux package in Ubuntu:
Incomplete
Bug description:
[ 20.935396] BUG: unable to handle kernel NULL pointer dereference at
0000000000000b84
[ 20.936130] IP: _raw_spin_lock_irqsave+0x22/0x40
[ 20.936540] PGD 0
[ 20.936540] P4D 0
[ 20.936725]
[ 20.937117] Oops: 0002 [#1] SMP
[ 20.937570] Modules linked in: bcache psmouse virtio_blk virtio_net
virtio_scsi pata_acpi floppy
[ 20.937686] bcache: bch_journal_replay() journal replay done, 558 keys in
30 entries, seq 593
[ 20.937782] bcache: register_cache() registered cache device vdc
[ 20.940029] CPU: 0 PID: 176 Comm: bcache_allocato Not tainted
4.13.0-19-generic #22-Ubuntu
[ 20.940825] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
[ 20.942112] task: ffff95c0ef878000 task.stack: ffffa8f1c0394000
[ 20.942903] RIP: 0010:_raw_spin_lock_irqsave+0x22/0x40
[ 20.943606] RSP: 0018:ffffa8f1c0397d00 EFLAGS: 00010046
[ 20.944232] RAX: 0000000000000000 RBX: 0000000000000246 RCX:
0000000000000000
[ 20.944849] RDX: 0000000000000001 RSI: 0000000000000003 RDI:
0000000000000b84
[ 20.945503] RBP: ffffa8f1c0397d08 R08: ffffffffc0376a20 R09:
aaaaaaaaaaaaaaab
[ 20.946125] R10: ffffa8f1c0369000 R11: ffff95c0fd120e78 R12:
0000000000000b84
[ 20.946745] R13: 0000000000000000 R14: 0000000000000021 R15:
0000000000000000
[ 20.947366] FS: 0000000000000000(0000) GS:ffff95c0ffc00000(0000)
knlGS:0000000000000000
[ 20.948112] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.948124] bcache: register_bdev() registered backing device vda2
[ 20.949494] CR2: 0000000000000b84 CR3: 000000002fb8e000 CR4:
00000000000006f0
[ 20.950311] Call Trace:
[ 20.950607] try_to_wake_up+0x40/0x480
[ 20.951048] wake_up_process+0x15/0x20
[ 20.951490] bch_bucket_alloc+0xa5/0x320 [bcache]
[ 20.952043] ? wait_woken+0x80/0x80
[ 20.952387] bch_prio_write+0x19f/0x340 [bcache]
[ 20.952797] bch_allocator_thread+0x569/0xc80 [bcache]
[ 20.953546] kthread+0x125/0x140
[ 20.953869] ? bch_invalidate_one_bucket+0x80/0x80 [bcache]
[ 20.954363] ? kthread_create_on_node+0x70/0x70
[ 20.954764] ret_from_fork+0x25/0x30
[ 20.955083] Code: ff 66 90 5d c3 0f 1f 40 00 0f 1f 44 00 00 55 48 89 e5 53
9c 58 0f 1f 44 00 00 48 89 c3 fa 66 0f 1f 44 00 00 31 c0 ba 01 00 00 00 <f0> 0f
b1 17 85 c0 75 06 48 89 d8 5b 5d c3 89 c6 e8 19 63 7c ff
[ 20.956770] RIP: _raw_spin_lock_irqsave+0x22/0x40 RSP: ffffa8f1c0397d00
[ 20.957579] CR2: 0000000000000b84
[ 20.958038] ---[ end trace 2fbf49a9fcc4299e ]---
[ 21.088078] tsc: Refined TSC clocksource calibration: 2397.221 MHz
[ 21.089038] clocksource: tsc: mask: 0xffffffffffffffff max_cycles:
0x228df650ba8, max_idle_ns: 440795214877 ns
Begin: Loading essential drivers ... [ 203.088012] raid6: sse2x1 gen()
5302 MB/s
Launched a vm like this:
qemu-system-x86_64 -enable-kvm \
-device virtio-scsi-pci,id=virtio-scsi-xkvm \
-device virtio-net-pci,netdev=net00 -netdev type=user,id=net00 \
-drive
file=/var/lib/jenkins/slaves/torkoal/workspace/curtin-vmtest-devel-amd64/output/ArtfulBcacheBasic/disks/install_disk.img,id=disk00,if=none,format=raw,index=0
\
-device
virtio-blk,drive=disk00,serial=install_disk.img,logical_block_size=512,physical_block_size=512,min_io_size=512
\
-drive
file=/var/lib/jenkins/slaves/torkoal/workspace/curtin-vmtest-devel-amd64/output/ArtfulBcacheBasic/boot/output_disk.img,id=disk01,if=none,format=raw,index=1
\
-device
virtio-blk,drive=disk01,serial=output_disk.img,logical_block_size=512,physical_block_size=512,min_io_size=512
\
-drive
file=/var/lib/jenkins/slaves/torkoal/workspace/curtin-vmtest-devel-amd64/output/ArtfulBcacheBasic/disks/extra_disk_0.img,id=disk02,if=none,format=raw,index=2
\
-device
virtio-blk,drive=disk02,serial=extra_disk_0.img,logical_block_size=512,physical_block_size=512,min_io_size=512
\
-drive
file=/var/lib/jenkins/slaves/torkoal/workspace/curtin-vmtest-devel-amd64/output/ArtfulBcacheBasic/boot/seed.img,id=disk03,if=none,format=raw,index=3,media=cdrom
-device virtio-blk,drive=disk03,serial=seed.img -smp 2 -m 1024 -nographic
-serial
file:/var/lib/jenkins/slaves/torkoal/workspace/curtin-vmtest-devel-amd64/output/ArtfulBcacheBasic/logs/boot-serial.log
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