Hello, I got a system crash with corrupted cashing device. The story: Booting after a clean halt was mounting the btrfs-on-luks-on-bcache as read- only. The production system was using a 4.19.1 kernel with bcache writeback mode, bfq scheduler. btrfs scrub showed un-repaired errors. Next step was booting a live Linux OpenSuse TW live with a recent 5.1.5 Kernel. Registering the caching device was segfaulting and crashing the root shell, leaving the bcache module unusable. Booting up again I registered the backing device only and made it online by echo 1 > running. # btrfs check -p /dev/mapper/_dev_bcache Opening filesystem to check... parent transid verify failed on 67670720512 wanted 718539 found 715246 parent transid verify failed on 67670720512 wanted 718539 found 715246 Ignoring transid failure Couldn't setup extent tree ERROR: cannot open file system # mount /dev/mapper/_dev_bcache /mnt/btrfs-top-lvl/ mount: /mnt/btrfs-top-lvl: wrong fs type, bad option, bad superblock on /dev/mapper/_dev_bcache, missing codepage or helper program, or other error. Looks like some writeback was missing, transid gap was huge. Reading that there have been some important patches on bcache released in 5.1.6 https://patchwork.kernel.org/patch/10909293/ I installed a very recent 5.2... kernel and booted. Now registering the caching device was not segfaulting anymore but freezing without any return. In dmesg I found only this part [see below] which happened earlier than my register. Is my bcache definitely lost? Best regards, Massimo (..considering leaving bcache as just another point-of-failure) [ 12.390390] ------------[ cut here ]------------ [ 12.390392] kernel BUG at drivers/md/bcache/bset.h:433! [ 12.390399] invalid opcode: 0000 [#1] SMP PTI [ 12.390402] CPU: 0 PID: 862 Comm: bcache-register Not tainted 5.2.0-rc3- 1.g038ee83-default #1 openSUSE Tumbleweed (unreleased) [ 12.390403] Hardware name: Hewlett-Packard HP EliteBook 8560w/1631, BIOS 68SVD Ver. F.03 07/25/2011 [ 12.390413] RIP: 0010:bch_extent_sort_fixup+0x724/0x730 [bcache] [ 12.390416] Code: ff ff 4c 89 c8 e9 3e ff ff ff 49 39 f1 0f 97 c1 e9 74 ff ff ff 49 39 f2 41 0f 97 c5 e9 12 ff ff ff 48 8b 04 24 e9 88 fa ff ff <0f> 0b 0f 0b 48 29 d0 e9 88 fe ff ff 66 66 66 66 90 41 57 41 56 41 [ 12.390417] RSP: 0000:ffffb40c82047a38 EFLAGS: 00010282 [ 12.390419] RAX: fffffffffffeb580 RBX: ffff8e2bea3c0020 RCX: 0000000000000000 [ 12.390420] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffb40c82047af0 [ 12.390421] RBP: ffffb40c82047a90 R08: 0000000005103b10 R09: ffff8e2bdca28ba0 [ 12.390422] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000005118630 [ 12.390423] R13: 0000000005118650 R14: ffffb40c82047ae0 R15: ffff8e2bea3c0000 [ 12.390424] FS: 00007f672f634bc0(0000) GS:ffff8e2beda00000(0000) knlGS:0000000000000000 [ 12.390426] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 12.390427] CR2: 00007f3b27b89900 CR3: 000000042b9d6003 CR4: 00000000000606f0 [ 12.390428] Call Trace: [ 12.390436] btree_mergesort+0x19b/0x5c0 [bcache] [ 12.390442] ? bch_cache_allocator_start+0x50/0x50 [bcache] [ 12.390446] ? __alloc_pages_nodemask+0x13c/0x2d0 [ 12.390451] __btree_sort+0x9e/0x1d0 [bcache] [ 12.390457] bch_btree_node_read_done+0x2cb/0x3c0 [bcache] [ 12.390462] bch_btree_node_read+0xdb/0x180 [bcache] [ 12.390467] ? bch_keybuf_init+0x60/0x60 [bcache] [ 12.390472] bch_btree_check_recurse+0x127/0x1f0 [bcache] [ 12.390477] bch_btree_check+0x18e/0x1b0 [bcache] [ 12.390479] ? wait_woken+0x70/0x70 [ 12.390486] run_cache_set+0x487/0x730 [bcache] [ 12.390492] register_bcache+0xbfa/0xf80 [bcache] [ 12.390495] ? __seccomp_filter+0x7b/0x680 [ 12.390497] ? kernfs_fop_write+0x101/0x180 [ 12.390502] ? bch_cache_set_alloc+0x540/0x540 [bcache] [ 12.390504] kernfs_fop_write+0x101/0x180 [ 12.390507] vfs_write+0xb6/0x1a0 [ 12.390509] ksys_write+0x4f/0xc0 [ 12.390512] do_syscall_64+0x60/0x130 [ 12.390516] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 12.390518] RIP: 0033:0x7f672f724854 [ 12.390520] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb bb 0f 1f 80 00 00 00 00 48 8d 05 e9 49 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 48 89 54 24 18 48 [ 12.390521] RSP: 002b:00007fffebc37088 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 12.390523] RAX: ffffffffffffffda RBX: 000000000000000a RCX: 00007f672f724854 [ 12.390524] RDX: 000000000000000a RSI: 000055bf4ea5e260 RDI: 0000000000000003 [ 12.390525] RBP: 000055bf4ea5e260 R08: 00000000ffffffff R09: 000000000000000a [ 12.390526] R10: 00007fffebc3958b R11: 0000000000000246 R12: 000000000000000a [ 12.390527] R13: 00007fffebc37110 R14: 000000000000000a R15: 00007f672f7f47c0 [ 12.390528] Modules linked in: intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm msr irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel mei_wdt mei_hdcp ghash_clmulni_intel iTCO_wdt iTCO_vendor_support ppdev arc4 bcache crc64 iwldvm mac80211 aesni_intel snd_hda_codec_idt aes_x86_64 crypto_simd snd_hda_codec_generic cryptd snd_hda_codec_hdmi ledtrig_audio glue_helper iwlwifi snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep cfg80211 snd_pcm joydev hp_wmi sparse_keymap pcspkr e1000e snd_timer wmi_bmof snd rfkill hp_accel(+) mei_me ptp lpc_ich soundcore pps_core lis3lv02d mei input_polldev parport_pc thermal(+) parport tpm_infineon pcc_cpufreq ac battery button uas usb_storage hid_generic usbhid radeon xhci_pci serio_raw xhci_hcd firewire_ohci i2c_algo_bit ehci_pci sdhci_pci firewire_core drm_kms_helper cqhci crc_itu_t sdhci ehci_hcd syscopyarea sysfillrect sysimgblt fb_sys_fops usbcore ttm mmc_core drm wmi video sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc [ 12.390559] scsi_dh_alua [ 12.390564] ---[ end trace 0613cd8ca3de039c ]--- [ 12.390569] RIP: 0010:bch_extent_sort_fixup+0x724/0x730 [bcache]
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