Kernel panic - not syncing: corrupted stack end detected inside scheduler
CPU: 1 PID: 3107 Comm: kworker/u4:4 Not tainted 4.20.0+ #175
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113
 panic+0x2ad/0x55f kernel/panic.c:189
 schedule_debug kernel/sched/core.c:3285 [inline]
 __schedule+0x1ec6/0x1ed0 kernel/sched/core.c:3394
 preempt_schedule_notrace+0x70/0x140 kernel/sched/core.c:3670
 ___preempt_schedule_notrace+0x16/0x31
 rcu_read_unlock_sched_notrace include/linux/rcupdate.h:745 [inline]
 trace_block_unplug include/trace/events/block.h:501 [inline]
 blk_mq_flush_plug_list+0xe94/0x11a0 block/blk-mq.c:1739
 blk_flush_plug_list+0x5d5/0x880 block/blk-core.c:1765
 blk_schedule_flush_plug include/linux/blkdev.h:1157 [inline]
 io_schedule_prepare+0xb6/0xe0 kernel/sched/core.c:5105
 io_schedule+0xc/0x70 kernel/sched/core.c:5136
 rq_qos_wait+0x2fb/0x5b0 block/blk-rq-qos.c:259
 __wbt_wait block/blk-wbt.c:523 [inline]
 wbt_wait+0x26b/0x440 block/blk-wbt.c:588
 __rq_qos_throttle+0x58/0xb0 block/blk-rq-qos.c:70
 rq_qos_throttle block/blk-rq-qos.h:177 [inline]
 blk_mq_make_request+0x524/0x1e30 block/blk-mq.c:1929
 generic_make_request+0x9a5/0x1890 block/blk-core.c:1087
 submit_bio+0xba/0x460 block/blk-core.c:1195
 ext4_io_submit+0x197/0x230 fs/ext4/page-io.c:356
 ext4_writepages+0x1411/0x4170 fs/ext4/inode.c:2839
 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2335
 __writeback_single_inode+0x20a/0x1660 fs/fs-writeback.c:1316
 writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580
 __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1649
 wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1758
 wb_check_start_all fs/fs-writeback.c:1882 [inline]
 wb_do_writeback fs/fs-writeback.c:1908 [inline]
 wb_workfn+0xee9/0x1790 fs/fs-writeback.c:1942
 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..