Hi Jens,
I found the following regression in ZNS devices when executing some basic
workload:
[ 182.240375] Call Trace:
[ 182.240517] <TASK>
[ 182.240656] btrfs_start_dirty_block_groups+0x6be/0xe80 [btrfs]
[ 182.241091] ? bio_init+0x398/0x620
[ 182.241307] ? btrfs_setup_space_cache+0x240/0x240 [btrfs]
[ 182.241731] ? mutex_unlock+0x80/0xd0
[ 182.241964] ? __mutex_unlock_slowpath.constprop.0+0x2a0/0x2a0
[ 182.242490] btrfs_commit_transaction+0x18aa/0x2820 [btrfs]
[ 182.242901] ? kasan_unpoison+0x23/0x50
[ 182.243156] ? join_transaction+0x255/0xe80 [btrfs]
[ 182.244105] ? btrfs_apply_pending_changes+0x50/0x50 [btrfs]
[ 182.244554] ? vfs_fsync_range+0x210/0x210
[ 182.244839] ? btrfs_attach_transaction_barrier+0x1f/0x70 [btrfs]
[ 182.245293] ? vfs_fsync_range+0x210/0x210
[ 182.245563] iterate_supers+0x109/0x200
[ 182.245794] ksys_sync+0xa8/0x130
[ 182.245990] ? vfs_fsync+0x200/0x200
[ 182.246197] ? do_user_addr_fault+0x31e/0xd60
[ 182.246454] ? kvm_read_and_reset_apf_flags+0x41/0x60
[ 182.247240] ? fpregs_assert_state_consistent+0x4a/0xb0
[ 182.247613] __do_sys_sync+0xa/0x10
[ 182.247827] do_syscall_64+0x3b/0x90
[ 182.248041] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 182.252155] </TASK>
[ 182.252281] ---[ end trace 0000000000000000 ]---
[ 182.252561] BTRFS: error (device nvme0n2) in btrfs_run_delayed_refs:2159:
errno=-17 Object already exists
[ 182.253110] BTRFS info (device nvme0n2): forced readonly
I am using QEMU with a ZNS drive with zoned.zone_capacity=128M,
zoned.zone_size=128M.
Steps to reproduce:
$ mkfs.btrfs /dev/nvme0n2 -d single -m single
$ mount -t btrfs /dev/nvme0n2 /mnt/btrfs
$ cd /mnt/btrfs
$ head --bytes 1048576 /dev/random >> 4k_rand.bin
$ sync
$ head --bytes 1048576 /dev/random >> 4k_rand.bin
$ sync
Git bisect run pointed the following as the offending commit:
commit 5581a5ddfe8d ("block: add completion handler for fast path")
The fast path completion handler does not handle the ZONE_APPEND
requests correctly.
Pankaj Raghav (1):
block: Add handling for zone append command in blk_complete_request
block/blk-mq.c | 4 ++++
1 file changed, 4 insertions(+)
--
2.25.1
