Kernel panic - not syncing: corrupted stack end detected inside scheduler CPU: 1 PID: 29937 Comm: syz-executor2 Not tainted 4.20.0-rc7+ #155 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 preempt_schedule_irq+0xb9/0x140 kernel/sched/core.c:3699 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:queue_work_on+0x17a/0x1e0 kernel/workqueue.c:1490 Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 73 48 83 3d e2 b7 00 08 00 74 44 e8 5b 3b 2e 00 48 89 df 57 9d <0f> 1f 44 00 00 eb a6 e8 4a 3b 2e 00 8b 7d d4 4c 89 e2 4c 89 fe 41 RSP: 0018:ffff8881b5c3c4c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000246 RCX: ffffc9000b998000 RDX: 0000000000040000 RSI: ffffffff81514915 RDI: 0000000000000246 RBP: ffff8881b5c3c4f8 R08: ffff88817e274e70 R09: 0000000000000006 R10: 0000000000000000 R11: ffff88817e274580 R12: 0000000000000200 R13: 0000000000000001 R14: ffffed1036b87800 R15: ffff8881d9a4e040 drain_all_pages+0x382/0x680 mm/page_alloc.c:2676 __alloc_pages_direct_reclaim mm/page_alloc.c:3809 [inline] __alloc_pages_slowpath+0xb61/0x2de0 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+0xa5/0x8c0 mm/slab.c:2677 fallback_alloc+0x204/0x2e0 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+0x9b1/0x18a0 block/blk-core.c:2452 submit_bio+0xba/0x460 block/blk-core.c:2560 mpage_bio_submit fs/mpage.c:66 [inline] do_mpage_readpage+0x169a/0x24d0 fs/mpage.c:316 mpage_readpages+0x56c/0x950 fs/mpage.c:404 blkdev_readpages+0x2c/0x40 fs/block_dev.c:578 read_pages+0x13a/0x680 mm/readahead.c:123 __do_page_cache_readahead+0x499/0x810 mm/readahead.c:209 ra_submit mm/internal.h:66 [inline] ondemand_readahead+0x54c/0xcc0 mm/readahead.c:491 page_cache_async_readahead+0x7b5/0xc50 mm/readahead.c:573 do_async_mmap_readahead mm/filemap.c:2392 [inline] filemap_fault+0x186e/0x25f0 mm/filemap.c:2444 __do_fault+0x100/0x6b0 mm/memory.c:2996 do_read_fault mm/memory.c:3408 [inline] do_fault mm/memory.c:3534 [inline] handle_pte_fault mm/memory.c:3765 [inline] __handle_mm_fault+0x3ea6/0x5be0 mm/memory.c:3889 handle_mm_fault+0x54f/0xc70 mm/memory.c:3926 do_user_addr_fault arch/x86/mm/fault.c:1423 [inline] __do_page_fault+0x5e8/0xe60 arch/x86/mm/fault.c:1489 do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1520 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 83 RSP: 0018:ffff8881b5c3f410 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 0000000000300b00 RCX: 00000000002e8b00 RDX: 0000000000300b00 RSI: 0000000020018000 RDI: ffff88816b818040 RBP: ffff8881b5c3f448 R08: 0000000000000000 R09: 000000000000c02c R10: ffffed102d760167 R11: ffff88816bb00b3f R12: 0000000020300b00 R13: 0000000020000000 R14: ffff88816b800040 R15: 00007ffffffff000 _copy_from_iter+0x274/0xf70 lib/iov_iter.c:738 copy_from_iter include/linux/uio.h:152 [inline] skb_copy_datagram_from_iter+0x112/0x660 net/core/datagram.c:521 tun_get_user+0x29fc/0x4250 drivers/net/tun.c:1845 tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:1997 call_write_iter include/linux/fs.h:1857 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_writev+0x1f1/0x360 fs/read_write.c:1004 do_writev+0x11a/0x310 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev fs/read_write.c:1109 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457521 Code: Bad RIP value. RSP: 002b:00007fa7a4cc7ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000300b00 RCX: 0000000000457521 RDX: 0000000000000001 RSI: 00007fa7a4cc7bf0 RDI: 00000000000000f0 RBP: 0000000020000000 R08: 00000000000000f0 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000293 R12: 00007fa7a4cc86d4 R13: 00000000004c537d R14: 00000000004d9890 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..