Kernel panic - not syncing: corrupted stack end detected inside scheduler
CPU: 1 PID: 11511 Comm: kworker/u4:6 Not tainted 4.20.0-rc7+ #157
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+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
 schedule_debug kernel/sched/core.c:3285 [inline]
 __schedule+0x21c6/0x21d0 kernel/sched/core.c:3394
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 io_schedule+0x1c/0x70 kernel/sched/core.c:5137
 __wbt_wait block/blk-wbt.c:569 [inline]
 wbt_wait+0x839/0x11a0 block/blk-wbt.c:639
 rq_qos_throttle+0x8d/0xf0 block/blk-rq-qos.c:77
 blk_mq_make_request+0x4c8/0x2590 block/blk-mq.c:1852
 generic_make_request+0x9b1/0x18a0 block/blk-core.c:2452
 submit_bio+0xba/0x460 block/blk-core.c:2560
 ext4_io_submit+0x197/0x230 fs/ext4/page-io.c:356
 ext4_writepages+0x1418/0x41a0 fs/ext4/inode.c:2839
 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2328
 __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_background_flush fs/fs-writeback.c:1826 [inline]
 wb_do_writeback fs/fs-writeback.c:1914 [inline]
 wb_workfn+0xd65/0x1790 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..