(gdb) thr a a bt

Thread 15 (Thread 0x7ffff3fe8700 (LWP 27173)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x00007ffff779172b in futex (val3=0, uaddr2=0x0, timeout=0x0, val=-1, op=0, uaddr=0x7fffec000900) at ../include/urcu/futex.h:65
#2  futex_async (timeout=0x0, uaddr2=0x0, val3=0, val=-1, op=0, uaddr=0x7fffec000900) at ../include/urcu/futex.h:97
#3  call_rcu_wait (crdp=0x7fffec0008c0) at urcu-call-rcu-impl.h:247
#4  call_rcu_thread (arg=0x7fffec0008c0) at urcu-call-rcu-impl.h:382
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7ffff3ff1700 (LWP 27169)):
#0  0x00007ffff670ef0e in pthread_mutex_unlock () from /lib64/libpthread.so.0
#1  0x000000000041c4a0 in del_timer (timer=timer@entry=0x7ffff7f813f0) at linux/timer.c:166
#2  0x00000000004172f8 in grab_pending (work=work@entry=0x7ffff7f813d0, is_dwork=is_dwork@entry=true) at linux/workqueue.c:118
#3  0x0000000000417722 in cancel_delayed_work (dwork=dwork@entry=0x7ffff7f813d0) at linux/workqueue.c:210
#4  0x00000000004b1b8e in __journal_entry_close (j=0x7ffff7f81078, closed_val=<optimized out>) at libbcachefs/journal.c:140
#5  0x00000000004b511d in __journal_res_get (j=j@entry=0x7ffff7f81078, res=res@entry=0x7ffff3ff08f0, flags=flags@entry=5)
    at libbcachefs/journal.c:379
#6  0x00000000004b5959 in bch2_journal_res_get_slowpath (j=0x7ffff7f81078, res=res@entry=0x7ffff3ff08f0, flags=flags@entry=5)
    at libbcachefs/journal.c:454
#7  0x00000000004af5a0 in bch2_journal_res_get (flags=5, u64s=<optimized out>, res=0x7ffff3ff08f0, j=<optimized out>)
    at libbcachefs/journal.h:360
#8  bch2_trans_journal_res_get (flags=5, trans=0x7ffff3ff0810) at libbcachefs/btree_update_leaf.c:301
#9  bch2_trans_commit_write_locked (trace_ip=<optimized out>, stopped_at=<synthetic pointer>, trans=0x7ffff3ff0810)
    at libbcachefs/btree_update_leaf.c:686
#10 do_bch2_trans_commit (trace_ip=<optimized out>, stopped_at=<synthetic pointer>, trans=0x7ffff3ff0810)
    at libbcachefs/btree_update_leaf.c:917
#11 __bch2_trans_commit (trans=trans@entry=0x7ffff3ff0810) at libbcachefs/btree_update_leaf.c:1149
#12 0x000000000049e5d0 in bch2_trans_commit (flags=<optimized out>, journal_seq=0x0, disk_res=0x0, trans=0x7ffff3ff0810)
    at libbcachefs/btree_update.h:105
#13 btree_key_cache_flush_pos (trans=trans@entry=0x7ffff3ff0810, key=..., journal_seq=journal_seq@entry=3,
    commit_flags=commit_flags@entry=64, evict=evict@entry=false) at libbcachefs/btree_key_cache.c:418
#14 0x000000000049e8dc in bch2_btree_key_cache_journal_flush (j=0x7ffff7f81078, pin=0x9ef2c0, seq=3) at libbcachefs/btree_key_cache.c:492
#15 0x0000000000494b37 in journal_flush_pins (j=j@entry=0x7ffff7f81078, seq_to_flush=seq_to_flush@entry=0, min_any=0, min_key_cache=0,
    min_key_cache@entry=1) at libbcachefs/journal_reclaim.c:506
#16 0x0000000000495dac in __bch2_journal_reclaim (j=j@entry=0x7ffff7f81078, direct=direct@entry=false) at libbcachefs/journal_reclaim.c:645
#17 0x0000000000495f33 in bch2_journal_reclaim_thread (arg=0x7ffff7f81078) at libbcachefs/journal_reclaim.c:684
#18 0x00000000004216c3 in kthread_start_fn (data=0x832f40) at linux/kthread.c:25
#19 0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#20 0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 13 (Thread 0x7ffff7e05700 (LWP 27160)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x82a280) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x82cf60) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7ffff7f46700 (LWP 27159)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x82c1c0) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x82c230) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7ffff7f4f700 (LWP 27157)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x82ac40) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x82ace0) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7ffff7f58700 (LWP 27155)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x82aac0) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x82ab80) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7ffff7f61700 (LWP 27150)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x82a340) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x82b6d0) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7ffff7fad700 (LWP 27121)):
#0  0x00007ffff670fa35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000041c1e0 in timer_thread (arg=<optimized out>) at linux/timer.c:263
#2  0x00000000004216c3 in kthread_start_fn (data=0x829c60) at linux/kthread.c:25
#3  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

---Type <return> to continue, or q <return> to quit---
Thread 7 (Thread 0x7ffff7fb6700 (LWP 27117)):
#0  0x00007ffff60f6644 in __io_getevents_0_4 () from /lib64/libaio.so.1
#1  0x000000000042028c in aio_completion_thread (arg=<optimized out>) at linux/blkdev.c:280
#2  0x00000000004216c3 in kthread_start_fn (data=0x829500) at linux/kthread.c:25
#3  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7ffff7fbf700 (LWP 27113)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x829140) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x8291b0) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7ffff7fc8700 (LWP 27112)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x828d00) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x828da0) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7ffff7fd1700 (LWP 27110)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x828900) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x828990) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7ffff7fda700 (LWP 27107)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x8284c0) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x828580) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7ffff7fe3700 (LWP 27103)):
#0  0x00007ffff5c1cd19 in syscall () from /lib64/libc.so.6
---Type <return> to continue, or q <return> to quit---
#1  0x0000000000421a32 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=<optimized out>, op=128, uaddr=<optimized out>)
    at /usr/include/urcu/futex.h:65
#2  schedule () at linux/sched.c:41
#3  0x0000000000417491 in worker_thread (arg=0x828100) at linux/workqueue.c:252
#4  0x00000000004216c3 in kthread_start_fn (data=0x828170) at linux/kthread.c:25
#5  0x00007ffff670bea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff5c229fd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7ffff7fe4b80 (LWP 27067)):
#0  0x00007ffff671254d in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00007ffff670de9b in _L_lock_883 () from /lib64/libpthread.so.0
#2  0x00007ffff670dd68 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x0000000000496239 in raw_spin_lock (lock=0x7ffff7f81328) at include/linux/spinlock.h:20
#4  bch2_journal_pin_set (j=0x7ffff7f81078, seq=7, pin=0xbd6fc0, flush_fn=0x49e800 <bch2_btree_key_cache_journal_flush>)
    at libbcachefs/journal_reclaim.c:380
#5  0x00000000004a0d43 in bch2_journal_pin_update (flush_fn=0x49e800 <bch2_btree_key_cache_journal_flush>, pin=<optimized out>,
    seq=<optimized out>, j=0x7ffff7f81078) at libbcachefs/journal_reclaim.h:66
#6  bch2_btree_insert_key_cached (trans=trans@entry=0x7fffffffd400, path=<optimized out>, insert=<optimized out>)
    at libbcachefs/btree_key_cache.c:550
#7  0x00000000004af900 in do_btree_insert_one (i=0x91f000, trans=0x7fffffffd400) at libbcachefs/btree_update_leaf.c:410
#8  bch2_trans_commit_write_locked (trace_ip=<optimized out>, stopped_at=<synthetic pointer>, trans=0x7fffffffd400)
    at libbcachefs/btree_update_leaf.c:738
#9  do_bch2_trans_commit (trace_ip=<optimized out>, stopped_at=<synthetic pointer>, trans=0x7fffffffd400)
    at libbcachefs/btree_update_leaf.c:917
#10 __bch2_trans_commit (trans=trans@entry=0x7fffffffd400) at libbcachefs/btree_update_leaf.c:1149
#11 0x0000000000461c28 in bch2_trans_commit (flags=0, journal_seq=0x0, disk_res=0x0, trans=0x7fffffffd400) at libbcachefs/btree_update.h:105
#12 bch2_trans_mark_metadata_bucket (trans=trans@entry=0x7fffffffd400, ca=ca@entry=0x914800, b=4780, type=type@entry=BCH_DATA_journal,
    sectors=512) at libbcachefs/buckets.c:1905
#13 0x0000000000461f80 in __bch2_trans_mark_dev_sb (ca=0x914800, trans=0x7fffffffd400) at libbcachefs/buckets.c:1971
#14 bch2_trans_mark_dev_sb (c=c@entry=0x7ffff7f63000, ca=ca@entry=0x914800) at libbcachefs/buckets.c:1983
#15 0x000000000049a544 in bch2_fs_initialize (c=0x7ffff7f63000) at libbcachefs/recovery.c:1394
#16 0x00000000004768c3 in bch2_fs_start (c=c@entry=0x7ffff7f63000) at libbcachefs/super.c:898
#17 0x0000000000478ee2 in bch2_fs_open (devices=devices@entry=0x8288d0, nr_devices=nr_devices@entry=1, opts=...) at libbcachefs/super.c:1905
#18 0x0000000000412f92 in cmd_format (argc=argc@entry=2, argv=argv@entry=0x7fffffffe418) at cmd_format.c:268
#19 0x0000000000407ff7 in main (argc=2, argv=0x7fffffffe418) at bcachefs.c:195