Hi, after adding an NVME (intel optane) as a journal device to an existing raid5 under kernel 4.12.4, I'm experiencing the following warnings in the kernel log: [ 5430.188385] WARNING: CPU: 4 PID: 0 at drivers/md/raid5-cache.c:296 __r5l_stripe_write_finished+0x1a8/0x1b0 [ 5430.188385] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl lockd grace af_packet tun bonding msr binfmt_misc dm_crypt loop rpcrdma sunrpc ib_srp scsi_transport_srp ib_ipoib rdma_ucm rdma_cm iw_cm ib_cm configfs ib_uverbs ib_umad mlx4_ib ib_core ipv6 input_leds led_class hid_generic usbhid hid ipmi_ssif evdev x86_pkg_temp_thermal crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc nct6775 igb hwmon_vid aesni_intel aes_x86_64 crypto_simd xhci_pci glue_helper xhci_hcd i2c_algo_bit ehci_pci cryptd ehci_hcd ptp i2c_i801 pps_core usbcore dca coretemp deadline_iosched mlx4_core hwmon i2c_core pcspkr usb_common intel_pch_thermal 8250 thermal 8250_base ipmi_si fan serial_core ipmi_devintf rtc_cmos ipmi_msghandler button unix [ 5430.188428] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 4.12.4 #1 [ 5430.188429] Hardware name: Supermicro X10SL7-F/X10SL7-F, BIOS 3.0a 12/17/2015 [ 5430.188430] task: ffff8807fbfba640 task.stack: ffffc900031b0000 [ 5430.188433] RIP: 0010:__r5l_stripe_write_finished+0x1a8/0x1b0 [ 5430.188434] RSP: 0018:ffff88081fd03d20 EFLAGS: 00010002 [ 5430.188435] RAX: 0000000000000082 RBX: ffff8804268b0ee0 RCX: 0000000000000001 [ 5430.188436] RDX: 0000000000000101 RSI: 0000000000000001 RDI: ffff880429884070 [ 5430.188437] RBP: ffff88081fd03d58 R08: 0000000000000101 R09: 0000000000000001 [ 5430.188438] R10: ffff88081fd03b10 R11: 0000000000000001 R12: ffff880429884078 [ 5430.188438] R13: ffff880429884070 R14: ffff8807f767eb28 R15: ffff880429884000 [ 5430.188440] FS: 0000000000000000(0000) GS:ffff88081fd00000(0000) knlGS:0000000000000000 [ 5430.188440] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5430.188441] CR2: 0000000001d2a000 CR3: 0000000001809000 CR4: 00000000001406e0 [ 5430.188442] Call Trace: [ 5430.188443] <IRQ> [ 5430.188446] r5l_log_endio+0x17c/0x290 [ 5430.188449] bio_endio+0x61/0x70 [ 5430.188453] blk_update_request+0x7d/0x2b0 [ 5430.188455] blk_mq_end_request+0x15/0x60 [ 5430.188459] nvme_complete_rq+0x1e/0xe0 [ 5430.188461] nvme_pci_complete_rq+0x10b/0x150 [ 5430.188463] __blk_mq_complete_request+0x8c/0x140 [ 5430.188464] blk_mq_complete_request+0x11/0x20 [ 5430.188466] __nvme_process_cq+0x89/0x1c0 [ 5430.188468] nvme_irq+0x1b/0x30 [ 5430.188471] __handle_irq_event_percpu+0x65/0xd0 [ 5430.188472] handle_irq_event_percpu+0x1e/0x50 [ 5430.188473] handle_irq_event+0x27/0x50 [ 5430.188475] handle_edge_irq+0x9a/0x120 [ 5430.188479] handle_irq+0x15/0x20 [ 5430.188481] do_IRQ+0x41/0xc0 [ 5430.188486] common_interrupt+0x86/0x86 [ 5430.188489] RIP: 0010:cpuidle_enter_state+0x15f/0x1f0 [ 5430.188490] RSP: 0018:ffffc900031b3e90 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffdc [ 5430.188491] RAX: ffff88081fd189c0 RBX: ffff88081fd1ff00 RCX: 000000000000001f [ 5430.188492] RDX: 20c49ba5e353f7cf RSI: ffff88081fd161d8 RDI: 0000000000000000 [ 5430.188492] RBP: ffffc900031b3ec0 R08: ffff88081fd15b24 R09: 0000000000000018 [ 5430.188493] R10: ffffc900031b3e70 R11: 0000000000000190 R12: 000004f05070ffde [ 5430.188494] R13: 0000000000000004 R14: ffffffff81850e18 R15: 0000000000000004 [ 5430.188494] </IRQ> [ 5430.188496] cpuidle_enter+0x12/0x20 [ 5430.188500] call_cpuidle+0x1e/0x30 [ 5430.188501] do_idle+0x16f/0x1b0 [ 5430.188503] cpu_startup_entry+0x18/0x20 [ 5430.188506] start_secondary+0xe8/0xf0 [ 5430.188508] secondary_startup_64+0x9f/0x9f [ 5430.188509] Code: c8 48 8b 80 d0 02 00 00 a8 08 74 be eb ad 48 8b 75 d0 4c 89 ef e8 29 75 0e 00 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b <0f> ff e9 97 fe ff ff 90 55 48 89 e5 41 57 41 56 41 55 41 54 49 [ 5430.188533] ---[ end trace 6ecece6f3eb41632 ]--- The warnings appear only if blk-mq is compiled in and enabled as default for dm per CONFIG_DM_MQ_DEFAULT. When I disable this option the warning disappears. I'm not sure whether I had writeback activated at that time. Complete dmesg output and kernel config available upon request. Kind regards, Vasco -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
