EXT4-fs (loop4): couldn't mount as ext3 due to feature incompatibilities
I/O error, dev loop3, sector 264064 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 59s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: free_ioctx
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: kfree_rcu_monitor
workqueue rcu_gp: flags=0x8
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    in-flight: 54:wait_rcu_exp_gp
workqueue netns: flags=0xe000a
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=3
    in-flight: 302:cleanup_net
workqueue ipv6_addrconf: flags=0x40008
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=2
    in-flight: 9:addrconf_verify_work
pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=0s workers=5 idle: 3772 7 4073
pool 4: cpus=0-1 flags=0x4 nice=0 hung=0s workers=12 idle: 314 310 469 33 32 299 471 10 466 340 26
Showing backtraces of running workers in stalled CPU-bound worker pools: