On Tue, 15 Aug 2017 14:07:42 +0200 Håkon Alstadheim wrote: > I'm getting some noise in my logs when shutting down bcache. > My system: > Linux gentoo 4.12.7-gentoo #1 SMP Sun Aug 13 22:56:20 CEST 2017 x86_64 > Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz GenuineIntel GNU/Linux > Running as dom0 under Xen-4.9.0 > > My shutdown script loops over the bcache devices like so: > --- > for f in /sys/fs/bcache/854fc80e-5499-413f-b90b-87a803eaca7e/bdev*; do > bdev=$(basename $f ) > if [ -e $f/stop ]; then > logger -t "init.d/probe-home-partition" -p daemon.warning\ > "Stopping $bdev" > einfo "Stopping $bdev" > if ! echo 1 > $f/stop ; then > ewarn "Could not stop $bdev" > logger -t "init.d/probe-home-partition" -p daemon.warning\ > "Could not stop $bdev" > fi > usleep 300 > sleep 1 > else > einfo "$bdev not cached?" > logger -t "init.d/probe-home-partition" -p daemon.warning \ > "$bdev not cached ?" > fi > done > > ----- > This gives me in daemon.log: > ----- > Aug 14 09:31:21 gentoo init.d/probe-home-partition: Stopping bdev15 > Aug 14 09:31:22 gentoo init.d/probe-home-partition: Stopping bdev16 > Aug 14 09:31:23 gentoo init.d/probe-home-partition: Stopping bdev17 > Aug 14 09:31:24 gentoo init.d/probe-home-partition: Stopping bdev18 > Aug 14 09:31:25 gentoo init.d/probe-home-partition: Stopping bdev19 > Aug 14 09:31:26 gentoo init.d/probe-home-partition: Stopping cache set > ----- > But it seems bcache is doing something weird, stopping a device called > bcache0, which I do not have, before stopping the first of my bcache > devices. ALL runs of "echo 1 > $device/stop" provoke a warning in > lib/idr.c on that same line. It may be that my stopping of the bcache > devices is wrong, un-necessary and misguided, but it should still work > the way I am doing it, should it not? > > > ---kern.log:--- > ... > [140395.421994] nfsd: last server has exited, flushing export cache > [140397.011932] XFS (bcache16): Unmounting Filesystem > [140397.248911] bcache: bcache_device_free() bcache0 stopped > [140398.300187] bcache: bcache_device_free() bcache16 stopped > [140398.381951] ida_remove called for id=16 which is not allocated. > [140398.381975] ------------[ cut here ]------------ > [140398.381985] WARNING: CPU: 1 PID: 4378 at lib/idr.c:383 > ida_remove+0xde/0xef > [140398.381987] Modules linked in: xt_physdev iptable_filter ip_tables > x_tables nfsd auth_rpcgss oid_registry nfsv4 dns_resolver nfsv3 nfs_acl > iTCO_wdt iTCO_vendor_support binfmt_misc tun usbip_host usbip_core > pktcdvd xen_wdt xen_blkback intel_rapl amdgpu intel_powerclamp > crc32c_intel serio_raw drm_kms_helper pcspkr syscopyarea sysfillrect > sysimgblt fb_sys_fops ttm lpc_ich i2c_i801 snd_hda_codec_realtek drm > snd_hda_codec_generic bcache snd_usb_audio snd_usbmidi_lib snd_hda_intel > snd_rawmidi snd_hda_codec snd_seq_device snd_hwdep snd_hda_core snd_pcm > snd_timer snd cp210x usbserial nct6775 input_leds hwmon_vid shpchp > ipmi_ssif wmi acpi_power_meter dm_zero dm_thin_pool dm_persistent_data > dm_bio_prison dm_service_time dm_round_robin dm_queue_length > dm_multipath dm_log_userspace cn virtio_pci virtio_scsi > [140398.382056] virtio_blk virtio_console virtio_balloon xts aes_x86_64 > cbc sha512_generic sha1_generic libiscsi scsi_transport_iscsi macvlan > virtio_net virtio_ring virtio e1000 fuse overlay nfs lockd grace sunrpc > fscache jfs multipath linear raid10 raid1 raid0 dm_raid raid456 > async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq > dm_snapshot dm_bufio dm_crypt dm_mirror dm_region_hash dm_log dm_mod dax > hid_sunplus hid_sony hid_samsung hid_pl hid_petalynx hid_monterey > hid_microsoft hid_logitech ff_memless hid_gyration hid_ezkey hid_cypress > hid_chicony hid_cherry hid_a4tech sl811_hcd xhci_plat_hcd ohci_pci > ohci_hcd uhci_hcd aic94xx lpfc qla2xxx aacraid sx8 DAC960 hpsa cciss > 3w_9xxx 3w_xxxx mptsas mptfc scsi_transport_fc mptspi mptscsih mptbase > atp870u dc395x qla1280 imm parport dmx3191d > [140398.382139] sym53c8xx gdth initio BusLogic arcmsr aic7xxx aic79xx > sg pdc_adma sata_inic162x sata_mv sata_qstor sata_vsc sata_uli sata_sis > sata_sx4 sata_nv sata_via sata_svw sata_sil24 sata_sil sata_promise > pata_sis usbhid led_class igb ptp dca i2c_algo_bit ehci_pci ehci_hcd > xhci_pci megaraid_sas xhci_hcd > [140398.382175] CPU: 1 PID: 4378 Comm: kworker/1:2 Not tainted > 4.12.6-gentoo #1 > [140398.382177] Hardware name: ASUSTeK COMPUTER INC. Z10PE-D8 > WS/Z10PE-D8 WS, BIOS 3407 03/10/2017 > [140398.382190] Workqueue: events cached_dev_free [bcache] > [140398.382193] task: ffff880216b24240 task.stack: ffffc900431e4000 > [140398.382197] RIP: e030:ida_remove+0xde/0xef > [140398.382199] RSP: e02b:ffffc900431e7db0 EFLAGS: 00010082 > [140398.382202] RAX: 0000000000000033 RBX: 0000000000000012 RCX: > 0000000000000000 > [140398.382204] RDX: ffff880249654450 RSI: ffff88024964dc08 RDI: > ffff88024964dc08 > [140398.382205] RBP: ffffc900431e7e10 R08: 0000000000000000 R09: > 00000000000448da > [140398.382207] R10: 0000000000001668 R11: ffffffff81f1dad0 R12: > ffffffffc08114c8 > [140398.382209] R13: ffffffffc08114c0 R14: 00000000000000fa R15: > 0000000000000010 > [140398.382223] FS: 0000000000000000(0000) GS:ffff880249640000(0000) > knlGS:ffff880249640000 > [140398.382225] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 > [140398.382227] CR2: 00007fb681059eb0 CR3: 000000020a7b9000 CR4: > 0000000000042660 > [140398.382230] Call Trace: > [140398.382238] ida_simple_remove+0x2f/0x45 > [140398.382247] bcache_device_free+0x8c/0xc4 [bcache] > [140398.382255] cached_dev_free+0x6b/0xe1 [bcache] > [140398.382261] process_one_work+0x16f/0x281 > [140398.382265] ? rescuer_thread+0x24e/0x24e > [140398.382268] worker_thread+0x1a4/0x257 > [140398.382272] ? rescuer_thread+0x24e/0x24e > [140398.382275] kthread+0xfc/0x101 > [140398.382278] ? init_completion+0x24/0x24 > [140398.382284] ret_from_fork+0x25/0x30 > [140398.382287] Code: 00 75 2a 4c 89 f7 e8 79 52 d5 ff 48 8d 75 b0 4c 89 > e2 4c 89 ef e8 03 3a 00 00 eb 11 44 89 fe 48 c7 c7 0a a1 a0 81 e8 c9 79 > d0 ff <0f> ff 48 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d c3 85 f6 79 02 > [140398.382341] ---[ end trace 279bbc0d0aae56cc ]---
Looks like a kernel bug, try the latest vanilla kernel. Best regards, Andrew Savchenko
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