Hi Bart,
On 12/13/2017 07:49 PM, Bart Van Assche wrote:
Would it be possible to repeat your test with the patch below applied on your
kernel tree? This patch has just been posted on the dm-devel mailing list.
Sorry for the delay. I missed this.
Unfortunately the oops problem still happens on PATCH v2 and that patch
(actually, the version that ended up in v4.15-rc4 [1] by Mike Snitzer).
The problem does not happen with PATCH v3 (a.k.a. v1) -- i.e., v3 is OK.
Thanks!
Test-case w/ PATCH v3:
---
[root@guest ~]# uname -r
4.15.0-rc4.mingleiv3
[root@guest ~]# reboot
...
systemd-shutdown[1]: Detaching DM devices.
systemd-shutdown[1]: Detaching DM 253:2.
shutdown: 7 output lines suppressed due to ratelimiting
dracut Warning: Killing all remaining processes
dracut Warning: Killing all remaining processes
XFS (dm-0): Unmounting Filesystem
dracut Warning: Unmounted /oldroot.
dracut: Disassembling device-mapper devices
Rebooting.
sd 0:0:0:0: [sda] Synchronizing SCSI cache
reboot: Restarting system
Test-case w/ PATCH v2:
---
[root@guest ~]# uname -r
4.15.0-rc4.mingleiv2
[root@guest ~]# reboot
...
systemd-shutdown[1]: Detaching DM devices.
systemd-shutdown[1]: Detaching DM 253:2.
Unable to handle kernel paging request for instruction fetch
Faulting instruction address: 0x00000000
Oops: Kernel access of bad area, sig: 11 [#1]
LE SMP NR_CPUS=2048 NUMA pSeries
Modules linked in: vmx_crypto virtio_balloon ip_tables x_tables xfs
libcrc32c virtio_net virtio_scsi crc32c_vpmsum virtio_pci virtio_ring
virtio autofs4
CPU: 3 PID: 1 Comm: systemd-shutdow Not tainted 4.15.0-rc4.mingleiv2 #4
<...>
NIP [0000000000000000] (null)
LR [c00000000057d0dc] __blk_run_queue+0x6c/0xb0
Call Trace:
[c0000001fb083970] [c0000001fb0839e0] 0xc0000001fb0839e0 (unreliable)
[c0000001fb0839a0] [c00000000057d6ec] blk_run_queue+0x4c/0x80
[c0000001fb0839d0] [c000000000592834] blk_freeze_queue_start+0xa4/0xb0
[c0000001fb083a00] [c00000000057deac] blk_set_queue_dying+0x6c/0x190
[c0000001fb083a30] [c0000000008a4b7c] __dm_destroy+0xac/0x300
[c0000001fb083ad0] [c0000000008b0244] dev_remove+0x154/0x1d0
[c0000001fb083b20] [c0000000008b0b70] ctl_ioctl+0x360/0x4f0
[c0000001fb083d10] [c0000000008b0d38] dm_ctl_ioctl+0x38/0x50
[c0000001fb083d50] [c0000000003867d8] do_vfs_ioctl+0xd8/0x8c0
[c0000001fb083df0] [c000000000387028] SyS_ioctl+0x68/0x100
[c0000001fb083e30] [c00000000000b760] system_call+0x58/0x6c
Instruction dump:
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
---[ end trace 0fceefbe4fc1cd29 ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=dm-4.15&id=afc567a4977b2d798e05153dd131a3c8d4758c0c
--
Mauricio Faria de Oliveira
IBM Linux Technology Center
