running an rsync -av --del as the only process hiting my btrfs backup filesystem. rsync is now stuck and so is all other access to the filesystem. Looking at ps it seems the btrfs-cleaner is running, so maybe that deadlocked with Stack for the rsync:
[<0>] balance_dirty_pages_ratelimited+0x270/0xca0 [<0>] __btrfs_buffered_write+0x3ae/0x730 [btrfs] [<0>] btrfs_file_write_iter+0x36e/0x510 [btrfs] [<0>] __vfs_write+0xcf/0x130 [<0>] vfs_write+0xab/0x190 [<0>] SyS_write+0x3d/0x90 [<0>] do_syscall_64+0x55/0x100 [<0>] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [<0>] 0xffffffffffffffff dmesg has a bunch of stuff starting with: [245043.379979] WARNING: CPU: 4 PID: 2608 at fs/btrfs/locking.c:251 btrfs_tree_lock+0x1be/0x1d0 [btrfs] [245043.381571] Modules linked in: ipmi_si mpt3sas raid_class scsi_transport_sas dell_rbu nfsv3 nfsv4 nfs fscache ext2 mgag200 intel_powerclamp i2c_algo_bit coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel drm_kms_helper aes_x86_64 joydev evdev crypto_simd iTCO_wdt cryptd syscopyarea iTCO_vendor_support sysfillrect sysimgblt dcdbas sg fb_sys_fops ttm glue_helper drm pcspkr serio_raw ipmi_devintf ipmi_msghandler lpc_ich acpi_power_meter i7core_edac mfd_core button nfsd auth_rpcgss oid_registry nfs_acl lockd grace sunrpc loop autofs4 ext4 crc32c_generic crc16 mbcache jbd2 btrfs xor zstd_decompress zstd_compress xxhash raid6_pq hid_generic usbhid hid sd_mod psmouse crc32c_intel i2c_core ehci_pci uhci_hcd ehci_hcd ixgbe mdio megaraid_sas usbcore ptp usb_common pps_core scsi_mod bnx2 [245043.391437] [last unloaded: ipmi_si] [245043.392792] CPU: 4 PID: 2608 Comm: btrfs-transacti Tainted: G W I 4.16.8 #1 [245043.395489] RIP: 0010:btrfs_tree_lock+0x1be/0x1d0 [btrfs] [245043.396791] RSP: 0018:ffffc9000424b840 EFLAGS: 00010246 [245043.398093] RAX: 0000000000000a30 RBX: ffff8807e20a3d20 RCX: 0000000000000001 [245043.399414] RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffff8807e20a3d20 [245043.400732] RBP: 0000000000000001 R08: ffff88041f39a700 R09: ffff880000000000 [245043.402021] R10: 0000000000000040 R11: ffff8807e20a3d20 R12: ffff8807cb220630 [245043.403296] R13: 0000000000000001 R14: ffff8807cb220628 R15: ffff88041fbdf000 [245043.404780] FS: 0000000000000000(0000) GS:ffff88082fc80000(0000) knlGS:0000000000000000 [245043.406050] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [245043.407321] CR2: 00007fffdbdb9f10 CR3: 0000000001c09005 CR4: 00000000000206e0 [245043.408670] Call Trace: [245043.409977] btrfs_search_slot+0x761/0xa60 [btrfs] [245043.411278] btrfs_insert_empty_items+0x62/0xb0 [btrfs] [245043.412572] btrfs_insert_item+0x5b/0xc0 [btrfs] [245043.413922] btrfs_create_pending_block_groups+0xfb/0x1e0 [btrfs] [245043.415216] do_chunk_alloc+0x1e5/0x2a0 [btrfs] [245043.416487] find_free_extent+0xcd0/0xf60 [btrfs] [245043.417813] btrfs_reserve_extent+0x96/0x1e0 [btrfs] [245043.419105] btrfs_alloc_tree_block+0xfb/0x4a0 [btrfs] [245043.420378] __btrfs_cow_block+0x127/0x550 [btrfs] [245043.421652] btrfs_cow_block+0xee/0x190 [btrfs] [245043.422979] btrfs_search_slot+0x227/0xa60 [btrfs] [245043.424279] ? btrfs_update_inode_item+0x59/0x100 [btrfs] [245043.425538] ? iput+0x72/0x1e0 [245043.426798] write_one_cache_group.isra.49+0x20/0x90 [btrfs] [245043.428131] btrfs_start_dirty_block_groups+0x102/0x420 [btrfs] [245043.429419] btrfs_commit_transaction+0x11b/0x880 [btrfs] [245043.430712] ? start_transaction+0x8e/0x410 [btrfs] [245043.432006] transaction_kthread+0x184/0x1a0 [btrfs] [245043.433341] kthread+0xf0/0x130 [245043.434628] ? btrfs_cleanup_transaction+0x4e0/0x4e0 [btrfs] [245043.435928] ? kthread_create_worker_on_cpu+0x40/0x40 [245043.437236] ret_from_fork+0x1f/0x30 [245043.438472] Code: 43 58 85 c0 75 2c f0 ff 43 58 f0 ff 43 44 65 48 8b 04 25 00 4d 01 00 8b 80 00 04 00 00 89 43 40 48 83 c4 28 5b 5d 41 5c 41 5d c3 <0f> 0b e9 60 fe ff ff 0f 0b eb d0 0f 1f 80 00 00 00 00 8b 47 4c [245043.441054] ---[ end trace 15abaa2aaf36827f ]--- ending with a stuck btrfs-transcaction: 245770.403336] btrfs-transacti D 0 2608 2 0x80000000 [245770.404281] Call Trace: [245770.405276] ? __schedule+0x2b1/0x770 [245770.406205] schedule+0x2d/0x80 [245770.407150] btrfs_tree_lock+0x111/0x1d0 [btrfs] [245770.408073] ? wait_woken+0x80/0x80 [245770.409059] btrfs_search_slot+0x761/0xa60 [btrfs] [245770.409994] btrfs_insert_empty_items+0x62/0xb0 [btrfs] [245770.410913] btrfs_insert_item+0x5b/0xc0 [btrfs] [245770.411817] btrfs_create_pending_block_groups+0xfb/0x1e0 [btrfs] [245770.412738] do_chunk_alloc+0x1e5/0x2a0 [btrfs] [245770.413627] find_free_extent+0xcd0/0xf60 [btrfs] [245770.414513] btrfs_reserve_extent+0x96/0x1e0 [btrfs] [245770.415398] btrfs_alloc_tree_block+0xfb/0x4a0 [btrfs] [245770.416285] __btrfs_cow_block+0x127/0x550 [btrfs] [245770.417230] btrfs_cow_block+0xee/0x190 [btrfs] [245770.418118] btrfs_search_slot+0x227/0xa60 [btrfs] [245770.419004] ? btrfs_update_inode_item+0x59/0x100 [btrfs] [245770.419880] ? iput+0x72/0x1e0 [245770.420791] write_one_cache_group.isra.49+0x20/0x90 [btrfs] [245770.421692] btrfs_start_dirty_block_groups+0x102/0x420 [btrfs] [245770.422602] btrfs_commit_transaction+0x11b/0x880 [btrfs] [245770.423507] ? start_transaction+0x8e/0x410 [btrfs] [245770.424464] transaction_kthread+0x184/0x1a0 [btrfs] [245770.425350] kthread+0xf0/0x130 [245770.426239] ? btrfs_cleanup_transaction+0x4e0/0x4e0 [btrfs] [245770.427124] ? kthread_create_worker_on_cpu+0x40/0x40 [245770.428008] ret_from_fork+0x1f/0x30 -- 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
