RAX: ffffffffffffffda RBX: 0000000001891fb7 RCX: 00007f6d0ad8bc65
RDX: 00007fff25448f00 RSI: 00007fff25448f00 RDI: 000000000040823b
RBP: 00007fff2544b290 R08: 0000000000000000 R09: 00000000000007e2
R10: 0000000000000011 R11: 0000000000000246 R12: 00000000004033c4
R13: 00007fff2544b3b0 R14: 0000000000000000 R15: 0000000000000000
Kernel panic - not syncing: corrupted stack end detected inside scheduler
CPU: 1 PID: 44 Comm: kworker/u4:2 Not tainted 4.20.0-rc7-next-20181224 #188
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/0x632 kernel/panic.c:214
 schedule_debug kernel/sched/core.c:3285 [inline]
 __schedule+0x1ecf/0x1ed0 kernel/sched/core.c:3394
 preempt_schedule_common+0x1f/0xe0 kernel/sched/core.c:3596
 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3622
 ___preempt_schedule+0x16/0x18
 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:176
 spin_unlock include/linux/spinlock.h:369 [inline]
 page_vma_mapped_walk_done include/linux/rmap.h:220 [inline]
 not_found mm/page_vma_mapped.c:12 [inline]
 page_vma_mapped_walk+0x2ec/0x27f0 mm/page_vma_mapped.c:228
 try_to_unmap_one+0x72d/0x3b20 mm/rmap.c:1392
 rmap_walk_file+0x80a/0x1190 mm/rmap.c:1890
 rmap_walk+0x22c/0x350 mm/rmap.c:1908
 try_to_unmap+0x1f3/0xa40 mm/rmap.c:1727
 shrink_page_list+0x4fe8/0xc350 mm/vmscan.c:1347
 shrink_inactive_list+0x77b/0x1c60 mm/vmscan.c:1970
Mem-Info:
active_anon:1367672 inactive_anon:181 isolated_anon:0
 active_file:116 inactive_file:166 isolated_file:50
 unevictable:0 dirty:7 writeback:6 unstable:0
 slab_reclaimable:17620 slab_unreclaimable:113241
 mapped:243 shmem:244 pagetables:17124 bounce:0
 free:25672 free_pcp:275 free_cma:0
 shrink_list mm/vmscan.c:2292 [inline]
 shrink_node_memcg+0x7a8/0x19a0 mm/vmscan.c:2557
 shrink_node+0x3e1/0x17f0 mm/vmscan.c:2772
 shrink_zones mm/vmscan.c:3006 [inline]
 do_try_to_free_pages+0x3df/0x12a0 mm/vmscan.c:3068
 try_to_free_pages+0x4d0/0xb90 mm/vmscan.c:3284
Node 0 active_anon:5470688kB inactive_anon:724kB active_file:464kB inactive_file:664kB unevictable:0kB isolated(anon):0kB isolated(file):200kB mapped:972kB dirty:28kB writeback:24kB shmem:976kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 5316608kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
 __perform_reclaim mm/page_alloc.c:4037 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4059 [inline]
 __alloc_pages_slowpath+0xa5a/0x2d90 mm/page_alloc.c:4452
Node 0 DMA free:15908kB min:164kB low:204kB high:244kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
 __alloc_pages_nodemask+0xa89/0xde0 mm/page_alloc.c:4666
lowmem_reserve[]: 0 2816 6319 6319
Node 0 DMA32 free:43736kB min:30040kB low:37548kB high:45056kB active_anon:2663044kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129332kB managed:2886768kB mlocked:0kB kernel_stack:33824kB pagetables:22956kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
lowmem_reserve[]: 0 0 3503 3503
 __alloc_pages include/linux/gfp.h:473 [inline]
 __alloc_pages_node include/linux/gfp.h:486 [inline]
 kmem_getpages mm/slab.c:1396 [inline]
 cache_grow_begin+0x91/0x8c0 mm/slab.c:2664
 fallback_alloc+0x203/0x2e0 mm/slab.c:3206
 ____cache_alloc_node+0x1c7/0x1e0 mm/slab.c:3274
 __do_cache_alloc mm/slab.c:3343 [inline]
 slab_alloc mm/slab.c:3371 [inline]
 kmem_cache_alloc+0x1f6/0x730 mm/slab.c:3539
 mempool_alloc_slab+0x44/0x60 mm/mempool.c:505
 mempool_alloc+0x193/0x4a0 mm/mempool.c:385
Node 0 Normal free:44052kB min:41472kB low:50816kB high:60160kB active_anon:2807644kB inactive_anon:724kB active_file:376kB inactive_file:464kB unevictable:0kB writepending:52kB present:4718592kB managed:3587560kB mlocked:0kB kernel_stack:61952kB pagetables:45540kB bounce:0kB free_pcp:140kB local_pcp:0kB free_cma:0kB
 bvec_alloc+0x12a/0x2d0 block/bio.c:218
 bio_alloc_bioset+0x46e/0x6f0 block/bio.c:509
 bio_alloc include/linux/bio.h:393 [inline]
 io_submit_init_bio fs/ext4/page-io.c:374 [inline]
 io_submit_add_bh fs/ext4/page-io.c:399 [inline]
 ext4_bio_write_page+0x1316/0x1c4d fs/ext4/page-io.c:505
lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 1*4kB (U) 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15908kB
 mpage_submit_page+0x15e/0x270 fs/ext4/inode.c:2236
 mpage_process_page_bufs+0x50a/0x600 fs/ext4/inode.c:2347
 mpage_prepare_extent_to_map+0xea5/0x19c0 fs/ext4/inode.c:2709
Node 0 DMA32: 892*4kB (UME) 33*8kB (ME) 2*16kB (ME) 8*32kB (UME) 1*64kB (M) 3*128kB (UME) 1*256kB (U) 2*512kB (UM) 1*1024kB (U) 2*2048kB (UM) 8*4096kB (M) = 43736kB
Node 0 Normal: 710*4kB (UMEH) 1187*8kB (UMEH) 1172*16kB (UME) 150*32kB (UME) 70*64kB (UME) 22*128kB (UM) 4*256kB (UM) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 44208kB
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
574 total pagecache pages
0 pages in swap cache
 ext4_writepages+0x1413/0x4190 fs/ext4/inode.c:2836
Swap cache stats: add 0, delete 0, find 0/0
Free swap  = 0kB
Total swap = 0kB
1965979 pages RAM
 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2335
0 pages HighMem/MovableOnly
 __writeback_single_inode+0x20a/0x1660 fs/fs-writeback.c:1316
343420 pages reserved
 writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580
0 pages cma reserved
oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/,task=syz-executor236,pid=15837,uid=0
 __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1649
 wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1758
Out of memory: Kill process 15837 (syz-executor236) score 0 or sacrifice child
Killed process 15837 (syz-executor236) total-vm:18244kB, anon-rss:2144kB, file-rss:52kB, shmem-rss:0kB
 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..