Re: device delete missing panic

[Anand Jain <Anand.Jain@oracle.com>]

your test case is same as in the patch below
and the panic was due to null bdev (which matches
in your logs).

   [RFC PATCH] btrfs: fix null pointer deference at 
btrfs_sysfs_add_one+0x105


But in your logs below, there isn't a panic right ?
wrong cut and paste ? or what did I miss?


Thanks, Anand



On 02/06/14 11:40 AM, Thermionix wrote:
> openSUSE 13.1 i686 8 device raid 10
> when replacing a failed disk (new device is added)
>
> ~ # uname -r
> 3.11.6-4-pae
>
> ~ # btrfs --version
> Btrfs v3.12+20131125
>
> ~ # mount -o degraded /pool
>
> ~ # journalctl | tail
>
> Feb 06 12:22:51 store03 kernel: device label pool devid 4 transid 55050
> /dev/sde
> Feb 06 12:22:53 store03 kernel: btrfs: allowing degraded mounts
> Feb 06 12:22:53 store03 kernel: btrfs: disk space caching is enabled
> Feb 06 12:22:53 store03 kernel: btrfs: bdev (null) errs: wr 353, rd 1,
> flush 17, corrupt 0, gen 0
> Feb 06 12:23:16 store03 kernel: BTRFS debug (device sde): unlinked 1 orphans
>
> ~ # btrfs filesystem show /dev/disk/by-label/pool
> Label: pool  uuid: 3e6ba20f-a4d0-40e4-88e7-a31c4930bcfe
>          Total devices 9 FS bytes used 5.19TiB
>          devid    1 size 1.36TiB used 169.50GiB path
>          devid    2 size 1.82TiB used 1.62TiB path /dev/sdc
>          devid    3 size 931.51GiB used 931.51GiB path /dev/sdd
>          devid    4 size 931.51GiB used 931.51GiB path /dev/sde
>          devid    6 size 1.82TiB used 1.62TiB path /dev/sdg
>          devid    7 size 1.82TiB used 1.62TiB path /dev/sdh
>          devid    8 size 931.51GiB used 931.51GiB path /dev/sdi
>          devid    9 size 1.82TiB used 1.62TiB path /dev/sdf
>          devid    10 size 1.82TiB used 1.01TiB path /dev/sdb
>
> ~ # btrfs device delete missing /pool
>
> ~ # journalctl -l | tail
>
> Feb 06 12:25:43 store03 kernel: btrfs: relocating block group
> 10590585618432 flags 68
> ...
> Feb 06 12:47:23 store03 kernel:  [<c025ebd2>] kthread+0x92/0xa0
> Feb 06 12:47:23 store03 kernel:  [<c06ece67>]
> ret_from_kernel_thread+0x1b/0x28
> Feb 06 12:47:23 store03 kernel:  [<c025eb40>]
> kthread_create_on_node+0xd0/0xd0
> Feb 06 12:47:23 store03 kernel: DWARF2 unwinder stuck at kthread+0x0/0xa0
> Feb 06 12:47:23 store03 kernel: Feb 06 12:47:23 store03 kernel: Leftover
> inexact backtrace:
> Feb 06 12:47:23 store03 kernel: ---[ end trace c47f82d03f79250d ]---
> Feb 06 12:47:23 store03 kernel: ------------[ cut here ]------------
> Feb 06 12:47:23 store03 kernel: WARNING: CPU: 0 PID: 3028 at
> /home/abuild/rpmbuild/BUILD/kernel-pae-3.11.6/linux-3.11/fs/btrfs/disk-io.c:482
> btree_csum_one_bio.isra.48+0x93/0x110 [btrfs]()
> Feb 06 12:47:23 store03 kernel: Modules linked in: bonding hwmon_vid
> btrfs raid6_pq zlib_deflate xor libcrc32c joydev hid_generic iTCO_wdt
> iTCO_vendor_support coretemp pcspkr serio_raw i2c_i801 ata_generic
> lpc_ich mfd_core usbhid mvsas libsas scsi_transport_sas e1000e ptp
> pps_core shpchp mperf sg dm_mod autofs4 ata_piix uhci_hcd ehci_pci
> ehci_hcd usbcore usb_common i915 fan thermal processor drm_kms_helper
> drm i2c_algo_bit button video thermal_sys scsi_dh_hp_sw scsi_dh_emc
> scsi_dh_rdac scsi_dh_alua scsi_dh
> Feb 06 12:47:23 store03 kernel: CPU: 0 PID: 3028 Comm: btrfs-worker-2
> Tainted: G        W    3.11.6-4-pae #1
> Feb 06 12:47:23 store03 kernel: Hardware name: PhoenixAward 945GM/945GM,
> BIOS 6.00 PG 08/13/2008
> Feb 06 12:47:23 store03 kernel:  00000009 c06e075a 00000000 c0242c5e
> c085dbc8 00000000 00000bd4 f8a06e34
> Feb 06 12:47:23 store03 kernel:  000001e2 f8985503 f8985503 00000002
> f5c60304 f2e606d8 c14ca4f0 c0242d1b
> Feb 06 12:47:23 store03 kernel:  00000009 00000000 f8985503 ef93d4a0
> f5c60304 e62a6c00 16c1f682 f46fe86c
> Feb 06 12:47:23 store03 kernel: Call Trace:
> Feb 06 12:47:23 store03 kernel:  [<c0204ef9>] try_stack_unwind+0x179/0x190
> Feb 06 12:47:23 store03 kernel:  [<c0203e17>] dump_trace+0x47/0xf0
> Feb 06 12:47:23 store03 kernel:  [<c0204f4f>] show_trace_log_lvl+0x3f/0x50
> Feb 06 12:47:23 store03 kernel:  [<c0203f10>] show_stack_log_lvl+0x50/0xd0
> Feb 06 12:47:23 store03 kernel:  [<c0204f9f>] show_stack+0x1f/0x40
> Feb 06 12:47:23 store03 kernel:  [<c06e075a>] dump_stack+0x3e/0x4e
> Feb 06 12:47:23 store03 kernel:  [<c0242c5e>] warn_slowpath_common+0x7e/0xa0
> Feb 06 12:47:23 store03 kernel:  [<c0242d1b>] warn_slowpath_null+0x1b/0x20
> Feb 06 12:47:23 store03 kernel:  [<f8985503>]
> btree_csum_one_bio.isra.48+0x93/0x110 [btrfs]
> Feb 06 12:47:23 store03 kernel:  [<f898261f>]
> run_one_async_start+0x2f/0x40 [btrfs]
> Feb 06 12:47:23 store03 kernel:  [<f89bdcb7>] worker_loop+0x107/0x470
> [btrfs]
> Feb 06 12:47:23 store03 kernel:  [<c025ebd2>] kthread+0x92/0xa0
> Feb 06 12:47:23 store03 kernel:  [<c06ece67>]
> ret_from_kernel_thread+0x1b/0x28
> Feb 06 12:47:23 store03 kernel:  [<c025eb40>]
> kthread_create_on_node+0xd0/0xd0
> Feb 06 12:47:23 store03 kernel: DWARF2 unwinder stuck at kthread+0x0/0xa0
> Feb 06 12:47:23 store03 kernel: Feb 06 12:47:23 store03 kernel: Leftover
> inexact backtrace:
> Feb 06 12:47:23 store03 kernel: ---[ end trace c47f82d03f79250e ]---
> Feb 06 12:47:23 store03 kernel: ------------[ cut here ]------------
> ...
>
> kernel soon locks up, any advice on how to proceed?
> any other info needed?
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