0 pages cma reserved syz-executor271 (7654) used greatest stack depth: 9976 bytes left syz-executor271 (7640) used greatest stack depth: 9416 bytes left syz-executor271 (7652) used greatest stack depth: 6696 bytes left syz-executor271 (7636) used greatest stack depth: 6616 bytes left Kernel panic - not syncing: corrupted stack end detected inside scheduler CPU: 1 PID: 29 Comm: kworker/u4:2 Not tainted 4.20.0-rc7+ #359 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/0x55c kernel/panic.c:188 oom_reaper: reaped process 7662 (syz-executor271), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB 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_is_watching+0x23/0x30 kernel/rcu/tree.c:907 rcu_read_lock+0x43/0x70 include/linux/rcupdate.h:608 mem_cgroup_iter+0x208/0x1160 mm/memcontrol.c:934 shrink_node+0x340/0x16b0 mm/vmscan.c:2723 shrink_zones mm/vmscan.c:2987 [inline] do_try_to_free_pages+0x3df/0x1290 mm/vmscan.c:3049 try_to_free_pages+0x4d0/0xb90 mm/vmscan.c:3264 __perform_reclaim mm/page_alloc.c:3773 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:3795 [inline] __alloc_pages_slowpath+0xa48/0x2df0 mm/page_alloc.c:4185 __alloc_pages_nodemask+0xad8/0xea0 mm/page_alloc.c:4393 alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2106 alloc_pages include/linux/gfp.h:509 [inline] __page_cache_alloc+0x38c/0x5b0 mm/filemap.c:924 pagecache_get_page+0x396/0xf00 mm/filemap.c:1554 find_or_create_page include/linux/pagemap.h:322 [inline] grow_dev_page fs/buffer.c:947 [inline] grow_buffers fs/buffer.c:1016 [inline] __getblk_slow fs/buffer.c:1043 [inline] __getblk_gfp+0x3aa/0xd50 fs/buffer.c:1320 sb_getblk include/linux/buffer_head.h:325 [inline] ext4_read_block_bitmap_nowait+0x314/0x1f50 fs/ext4/balloc.c:427 ext4_read_block_bitmap+0x1f/0x90 fs/ext4/balloc.c:527 ext4_mb_mark_diskspace_used+0x19e/0x10d0 fs/ext4/mballoc.c:2938 ext4_mb_new_blocks+0xea5/0x4840 fs/ext4/mballoc.c:4555 ext4_ext_map_blocks+0x2eef/0x6180 fs/ext4/extents.c:4404 ext4_map_blocks+0x8f7/0x1b60 fs/ext4/inode.c:636 mpage_map_one_extent fs/ext4/inode.c:2480 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2533 [inline] ext4_writepages+0x2573/0x4180 fs/ext4/inode.c:2884 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_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..