>From time to time during IO load I see the following warning probably related to bcache: [61206.106503] ------------[ cut here ]------------ [61206.106509] WARNING: CPU: 1 PID: 143 at kernel/workqueue.c:2035 process_one_work+0x44/0x310 [61206.106510] Modules linked in: bridge stp llc veth rfcomm fuse bnep cachefiles snd_hda_codec_realtek snd_hda_codec_hdmi btusb btintel bluetooth snd_hda_codec_generic rfkill ecdh_generic snd_hda_intel snd_hda_codec snd_hda_core snd_pcm snd_timer af_packet iTCO_wdt iTCO_vendor_support snd tun lpc_ich soundcore rtc_cmos kvm_intel kvm irqbypass uas usb_storage r8168(O) nvidia_drm(PO) vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) nvidia_uvm(PO) nvidia_modeset(PO) nvidia(PO) nct6775 hwmon_vid coretemp hwmon efivarfs [61206.106528] CPU: 1 PID: 143 Comm: bcache Tainted: P O 4.13.11-ck #1 [61206.106529] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z68 Pro3, BIOS L2.16A 02/22/2013 [61206.106532] task: ffff880419459880 task.stack: ffffc90000584000 [61206.106533] RIP: 0010:process_one_work+0x44/0x310 [61206.106534] RSP: 0018:ffffc90000587e78 EFLAGS: 00210097 [61206.106534] RAX: 0000000000000001 RBX: ffff880419a6c0c0 RCX: ffff88042f297f60 [61206.106535] RDX: ffff88042f297f58 RSI: ffff880036d155f8 RDI: ffff880419a6c0c0 [61206.106535] RBP: ffff88042f297f40 R08: 0000000000000000 R09: 0000000000000000 [61206.106536] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [61206.106536] R13: ffff88042f2a1800 R14: ffff88042f2a1880 R15: ffff880419a6c0f0 [61206.106537] FS: 0000000000000000(0000) GS:ffff88042f240000(0000) knlGS:0000000000000000 [61206.106537] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [61206.106538] CR2: 00000000000000b0 CR3: 0000000002c0a000 CR4: 00000000001406e0 [61206.106538] Call Trace: [61206.106540] ? rescuer_thread+0x20b/0x370 [61206.106542] ? kthread+0xf2/0x130 [61206.106542] ? process_one_work+0x310/0x310 [61206.106543] ? kthread_create_on_node+0x40/0x40 [61206.106545] ? ret_from_fork+0x22/0x30 [61206.106546] Code: 04 b8 00 00 00 00 4c 0f 44 e8 49 8b 45 08 44 8b a0 00 01 00 00 41 83 e4 20 f6 45 10 04 75 0e 65 8b 05 b9 0c f7 7e 3b 45 04 74 02 <0f> ff 48 ba eb 83 b5 80 46 86 c8 61 48 0f af d6 48 c1 ea 3a 48 [61206.106559] ---[ end trace 4e29a063c356211b ]--- When I compile the kernel with transparent huge pages support and/or do not blacklist the floppy.ko module, this warning usually has a more severe impact and damages the file system and the system itself becomes unresponsive. This time the system seems to have survived (it's responsive, memory allocations seem to be fine, IO is working across all devices). I've seen this previously and first disabled transparent huge pages because memory allocations were involved (and then there were following backtraces with btrfs involved). Next time it hit me, the floppy module was involved in the backtrace (tho I don't see why, I have no floppy controller, the module becomes loaded nevertheless), so I blacklisted it. By that time, btrfs was also involved into following backtraces. Now, with both disabled, I only see "Comm: bcache", the only clue bcache related. And I'm seeing only this backtrace and not a whole bunch of backtraces eventually leading up to filesystem corruption. Can you make any use of this? -- Regards, Kai Replies to list-only preferred. -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
