Hi, I recently upgraded from Linux 4.4.0 to 4.13.0 (Ubuntu 16.04 stock to hwe kernel).
Since then, I've noticed lots of btrfs warnings in dmesg (example at the end). I believe these warnings to be benign, and they relate to my partition not being a multiple of 4KiB in size (I confirmed that alignment is okay in this instance). I would like to confirm a couple of things: 1. Is this warning definitely safe to ignore? 2. If this warning is a false alarm, has it been removed in more recent kernel versions (after 4.13)? I'd like to know if the warning will go away when I upgrade the kernel further, or if I'll have to recreate my partitions in order to resolve these warnings (which clog dmesg). Thanks. Example: [101320.529729] ------------[ cut here ]------------ [101320.529761] WARNING: CPU: 1 PID: 5027 at /build/linux-hwe-v6kHHF/linux-hwe-4.13.0/fs/btrfs/ctree.h:1559 btrfs_update_device+0x1b4/0x1c0 [btrfs] [101320.529762] Modules linked in: binfmt_misc dm_crypt crypto_simd glue_helper aes_x86_64 algif_skcipher af_alg gpio_ich intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass intel_cstate intel_rapl_perf ipmi_ssif serio_raw ipmi_si hpilo acpi_power_meter ipmi_devintf ipmi_msghandler mac_hid lpc_ich shpchp ie31200_edac ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear mgag200 i2c_algo_bit ttm crct10dif_pclmul uas drm_kms_helper tg3 syscopyarea sysfillrect sysimgblt fb_sys_fops crc32_pclmul ptp ghash_clmulni_intel cryptd psmouse ahci libahci usb_storage drm pps_core [101320.529803] CPU: 1 PID: 5027 Comm: kworker/u128:8 Tainted: G W 4.13.0-39-generic #44~16.04.1-Ubuntu [101320.529804] Hardware name: HP ProLiant MicroServer Gen8, BIOS J06 06/06/2014 [101320.529809] Workqueue: writeback wb_workfn (flush-btrfs-2) [101320.529811] task: ffff9602b332d900 task.stack: ffffa4ca02e08000 [101320.529829] RIP: 0010:btrfs_update_device+0x1b4/0x1c0 [btrfs] [101320.529830] RSP: 0018:ffffa4ca02e0b498 EFLAGS: 00010206 [101320.529831] RAX: 0000000000000fff RBX: 0000000000000000 RCX: 0000074702251e00 [101320.529832] RDX: 0000000000000004 RSI: 0000000000003f5c RDI: ffff9602947aedf0 [101320.529833] RBP: ffffa4ca02e0b4e0 R08: 0000000000003f60 R09: ffffa4ca02e0b450 [101320.529834] R10: 0000000000001000 R11: 0000000000000003 R12: ffff9602b3a391c0 [101320.529835] R13: ffff9602f1bbe400 R14: 0000000000003f3c R15: ffff9602947aedf0 [101320.529837] FS: 0000000000000000(0000) GS:ffff9602fa440000(0000) knlGS:0000000000000000 [101320.529838] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [101320.529839] CR2: 00007feb823bb000 CR3: 000000002740a005 CR4: 00000000001606e0 [101320.529840] Call Trace: [101320.529860] btrfs_finish_chunk_alloc+0x134/0x510 [btrfs] [101320.529877] ? free_extent_buffer+0x4b/0xa0 [btrfs] [101320.529891] ? btrfs_insert_item+0x80/0xf0 [btrfs] [101320.529906] btrfs_create_pending_block_groups+0x135/0x250 [btrfs] [101320.529919] ? btrfs_create_pending_block_groups+0x135/0x250 [btrfs] [101320.529936] __btrfs_end_transaction+0x8e/0x2e0 [btrfs] [101320.529951] btrfs_end_transaction+0x10/0x20 [btrfs] [101320.529965] find_free_extent+0xd12/0xfe0 [btrfs] [101320.529981] ? btrfs_defrag_leaves+0x360/0x360 [btrfs] [101320.529996] btrfs_reserve_extent+0x9b/0x1f0 [btrfs] [101320.530011] cow_file_range.isra.62+0x15b/0x430 [btrfs] [101320.530026] run_delalloc_range+0x2ba/0x3a0 [btrfs] [101320.530042] ? find_lock_delalloc_range.constprop.55+0x1d3/0x200 [btrfs] [101320.530058] writepage_delalloc.isra.45+0x10d/0x170 [btrfs] [101320.530073] __extent_writepage+0xd9/0x300 [btrfs] [101320.530088] extent_write_cache_pages.constprop.52+0x2c5/0x400 [btrfs] [101320.530104] extent_writepages+0x5c/0x90 [btrfs] [101320.530119] ? btrfs_releasepage+0x20/0x20 [btrfs] [101320.530133] btrfs_writepages+0x28/0x30 [btrfs] [101320.530136] do_writepages+0x1f/0x70 [101320.530138] __writeback_single_inode+0x45/0x330 [101320.530141] ? fprop_reflect_period_percpu.isra.5+0x8e/0xc0 [101320.530143] writeback_sb_inodes+0x26a/0x600 [101320.530146] __writeback_inodes_wb+0x92/0xc0 [101320.530148] wb_writeback+0x274/0x330 [101320.530151] wb_workfn+0x18a/0x3b0 [101320.530152] ? wb_workfn+0x18a/0x3b0 [101320.530156] process_one_work+0x15b/0x410 [101320.530158] worker_thread+0x4b/0x460 [101320.530161] kthread+0x10c/0x140 [101320.530163] ? process_one_work+0x410/0x410 [101320.530164] ? kthread_create_on_node+0x70/0x70 [101320.530166] ret_from_fork+0x35/0x40 [101320.530168] Code: 00 4c 89 ff 45 31 c0 ba 10 00 00 00 4c 89 f6 e8 73 23 ff ff 4c 89 ff e8 7b f5 fc ff e9 d9 fe ff ff b8 f4 ff ff ff e9 d9 fe ff ff <0f> ff eb b8 e8 53 08 01 cb 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 [101320.530199] ---[ end trace 7a108943044dc9ba ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
