Node 0 Normal free:8kB min:24kB low:28kB high:32kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:1048576kB managed:2000kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
INFO: task syz-executor.4:24160 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28288 24160  29083 0x80000002
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
lowmem_reserve[]: 0 0 0 0 0
 __mutex_lock_common kernel/locking/mutex.c:1016 [inline]
 __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078
Node 1 Normal free:53076kB min:53876kB low:67344kB high:80812kB active_anon:147024kB inactive_anon:3510276kB active_file:40kB inactive_file:0kB unevictable:0kB writepending:0kB present:4194304kB managed:4128248kB mlocked:0kB kernel_stack:57024kB pagetables:83104kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
 tun_detach drivers/net/tun.c:759 [inline]
 tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
lowmem_reserve[]: 0 0 0 0 0
Node 0 DMA: 6*4kB (UME) 0*8kB 2*16kB (UM) 3*32kB (UE) 3*64kB (UE) 3*128kB (UME) 4*256kB (UME) 2*512kB (UE) 2*1024kB (ME) 1*2048kB (E) 1*4096kB (M) = 10968kB
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xbf3/0x2be0 kernel/exit.c:870