audit: type=1400 audit(1545745040.033:39): avc: denied { read } for pid=8659 comm="syz-executor171" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 Kernel panic - not syncing: corrupted stack end detected inside scheduler CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.20.0 #167 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 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:__remove_mapping+0x121/0x1af0 mm/vmscan.c:887 Code: c7 40 50 f2 f2 f2 f2 c7 40 54 00 f2 f2 f2 c7 40 58 f2 f2 f2 f2 c7 40 5c 00 f2 f2 f2 c7 40 60 f2 f2 f2 f2 c7 40 64 00 f2 f2 f2 40 68 f2 f2 f2 f2 c7 40 6c 00 f2 f2 f2 c7 40 70 f2 f2 f2 f2 c7 RSP: 0018:ffff8881d9ac1740 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffffed103b3582f2 RBX: ffffea00076bff80 RCX: ffffffff81a6e714 RDX: 0000000000000001 RSI: ffffea00076bff80 RDI: ffff8881cc4f2730 RBP: ffff8881d9ac1bd8 R08: ffff8881d9ab41c0 R09: fffff94000ed7ff6 R10: fffff94000ed7ff6 R11: ffffea00076bffb3 R12: ffff8881d9ac1bb0 R13: ffffea00076bff88 R14: dffffc0000000000 R15: ffff8881cc4f2730 shrink_page_list+0x664c/0xc620 mm/vmscan.c:1457 shrink_inactive_list+0x77b/0x1c60 mm/vmscan.c:1963 shrink_list mm/vmscan.c:2275 [inline] shrink_node_memcg+0x78b/0x18f0 mm/vmscan.c:2540 shrink_node+0x3bc/0x16b0 mm/vmscan.c:2755 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 include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] kmem_getpages mm/slab.c:1409 [inline] cache_grow_begin+0x91/0x8c0 mm/slab.c:2677 fallback_alloc+0x203/0x2e0 mm/slab.c:3219 ____cache_alloc_node+0x1c7/0x1e0 mm/slab.c:3287 __do_cache_alloc mm/slab.c:3356 [inline] slab_alloc mm/slab.c:3384 [inline] kmem_cache_alloc+0x1f8/0x730 mm/slab.c:3552 mempool_alloc_slab+0x44/0x60 mm/mempool.c:505 mempool_alloc+0x193/0x4a0 mm/mempool.c:385 bio_alloc_bioset+0x3a8/0x700 block/bio.c:489 bio_clone_fast+0x26/0x110 block/bio.c:629 bio_split+0x86/0x260 block/bio.c:1802 blk_bio_segment_split block/blk-merge.c:231 [inline] blk_queue_split+0xa22/0x20f0 block/blk-merge.c:262 blk_mq_make_request+0x2e9/0x2590 block/blk-mq.c:1840 generic_make_request+0x9be/0x15a0 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 io_submit_add_bh fs/ext4/page-io.c:396 [inline] ext4_bio_write_page+0xb4d/0x19c3 fs/ext4/page-io.c:506 mpage_submit_page+0x15e/0x270 fs/ext4/inode.c:2237 mpage_map_and_submit_buffers+0x55e/0xa40 fs/ext4/inode.c:2434 mpage_map_and_submit_extent fs/ext4/inode.c:2572 [inline] ext4_writepages+0x2720/0x4180 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..