================================================================== BUG: KASAN: slab-out-of-bounds in __write_once_size include/linux/compiler.h:218 [inline] BUG: KASAN: slab-out-of-bounds in __hlist_del include/linux/list.h:702 [inline] BUG: KASAN: slab-out-of-bounds in hlist_del_init include/linux/list.h:717 [inline] BUG: KASAN: slab-out-of-bounds in __xfrm_policy_unlink+0x977/0xa00 net/xfrm/xfrm_policy.c:2213 Write of size 8 at addr ffff88805a86c3e8 by task syz-executor1/5823 CPU: 0 PID: 5823 Comm: syz-executor1 Not tainted 4.20.0+ #1 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:438 __write_once_size include/linux/compiler.h:218 [inline] __hlist_del include/linux/list.h:702 [inline] hlist_del_init include/linux/list.h:717 [inline] __xfrm_policy_unlink+0x977/0xa00 net/xfrm/xfrm_policy.c:2213 xfrm_policy_flush+0x331/0x460 net/xfrm/xfrm_policy.c:1789 pfkey_spdflush+0xaf/0x3c0 net/key/af_key.c:2785 pfkey_process+0x6d2/0x810 net/key/af_key.c:2844 pfkey_sendmsg+0x5bb/0xfc0 net/key/af_key.c:3683 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0fa15a9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0fa15aa6d4 R13: 00000000004c5194 R14: 00000000004d8a28 R15: 00000000ffffffff Allocated by task 24250: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x700 mm/slab.c:3554 mempool_alloc_slab+0x47/0x60 mm/mempool.c:505 mempool_alloc+0x19f/0x500 mm/mempool.c:385 bvec_alloc+0xe0/0x2f0 block/bio.c:218 bio_alloc_bioset+0x49e/0x730 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+0xf1b/0x18fa fs/ext4/page-io.c:506 mpage_submit_page+0x15a/0x270 fs/ext4/inode.c:2237 mpage_process_page_bufs+0x517/0x610 fs/ext4/inode.c:2348 mpage_prepare_extent_to_map+0xe27/0x1950 fs/ext4/inode.c:2710 ext4_writepages+0x138e/0x4180 fs/ext4/inode.c:2837 do_writepages+0x99/0x1a0 mm/page-writeback.c:2328 __writeback_single_inode+0x1c5/0x1620 fs/fs-writeback.c:1316 writeback_sb_inodes+0x762/0x1260 fs/fs-writeback.c:1580 __writeback_inodes_wb+0x16d/0x3d0 fs/fs-writeback.c:1649 wb_writeback+0xa26/0xf90 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+0xe52/0x16f0 fs/fs-writeback.c:1942 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 24250: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3760 mempool_free_slab+0x1e/0x30 mm/mempool.c:512 mempool_free+0xed/0x380 mm/mempool.c:494 bvec_free+0xa6/0xc0 block/bio.c:173 bio_free+0xc7/0x150 block/bio.c:259 bio_put+0x183/0x200 block/bio.c:561 ext4_end_bio+0x1a6/0x700 fs/ext4/page-io.c:343 bio_endio+0x5b9/0xb50 block/bio.c:1776 req_bio_endio block/blk-core.c:278 [inline] blk_update_request+0x3c3/0xcf0 block/blk-core.c:3075 scsi_end_request+0xf2/0xe20 drivers/scsi/scsi_lib.c:673 scsi_io_completion+0x2b7/0x1c90 drivers/scsi/scsi_lib.c:1101 kobject: 'tunl0' (00000000593e9d48): fill_kobj_path: path = '/devices/virtual/net/tunl0' scsi_finish_command+0x527/0x910 drivers/scsi/scsi.c:248 scsi_softirq_done+0x45d/0x520 drivers/scsi/scsi_lib.c:1745 blk_done_softirq+0x497/0x730 block/blk-softirq.c:37 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 kobject: 'queues' (00000000feb24e54): kobject_add_internal: parent: 'tunl0', set: '' The buggy address belongs to the object at ffff88805a86cd40 which belongs to the cache biovec-max of size 8192 The buggy address is located 2392 bytes to the left of 8192-byte region [ffff88805a86cd40, ffff88805a86ed40) The buggy address belongs to the page: page:ffffea00016a1b00 count:1 mapcount:0 mapping:ffff8880a7d0b9c0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00027df408 ffffea00021e4b08 ffff8880a7d0b9c0 raw: 0000000000000000 ffff88805a86cd40 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805a86c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805a86c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805a86c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805a86c400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805a86c480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================