kmem_cache               219KB        225KB
Out of memory: Kill process 9604 (syz-executor642) score 999 or sacrifice child
Killed process 9604 (syz-executor642) total-vm:17560kB, anon-rss:72kB, file-rss:0kB, shmem-rss:0kB
oom_reaper: reaped process 9604 (syz-executor642), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
syz-executor642 (9594) used greatest stack depth: 6616 bytes left
Kernel panic - not syncing: corrupted stack end detected inside scheduler
CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 4.20.0+ #252
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_irq+0x87/0x110 kernel/sched/core.c:3699
 retint_kernel+0x1b/0x2d
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:325 [inline]
RIP: 0010:PageLocked include/linux/page-flags.h:281 [inline]
RIP: 0010:__add_to_page_cache_locked+0x48c/0x1840 mm/filemap.c:807
Code: f8 83 e0 01 48 89 c6 48 89 85 80 fc ff ff e8 bb a7 e1 ff 48 8b 85 80 fc ff ff 4c 8b ad 88 fc ff ff 48 85 c0 0f 85 83 0e 00 00 <e8> 6f a6 e1 ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03
RSP: 0018:ffff8880a9e14668 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff8880a9e14a08 RCX: ffffffff819fff65
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: ffff8880a9e14a30 R08: ffff8880a9e061c0 R09: ffffed1015ce5b8f
R10: ffffea00052dfc80 R11: ffff8880ae72dc7b R12: ffff88821a1f6430
R13: ffffea00052dfc80 R14: 0000000000000003 R15: dead000000000100
 add_to_page_cache_lru+0x355/0xdb0 mm/filemap.c:886
syz-executor642 invoked oom-killer: gfp_mask=0x6202c2(GFP_HIGHUSER|__GFP_NOWARN), nodemask=(null), order=0, oom_score_adj=1000
syz-executor642 cpuset=syz4 mems_allowed=0-1
 pagecache_get_page+0x53a/0xf00 mm/filemap.c:1565
 find_or_create_page include/linux/pagemap.h:322 [inline]
 ext4_mb_load_buddy_gfp+0xa80/0x1e70 fs/ext4/mballoc.c:1194
 ext4_mb_load_buddy fs/ext4/mballoc.c:1241 [inline]
 ext4_mb_regular_allocator+0x634/0x1590 fs/ext4/mballoc.c:2190
 ext4_mb_new_blocks+0x1de3/0x4840 fs/ext4/mballoc.c:4538
 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..