name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 21764 Comm: syz-executor0 Not tainted 4.18.0-rc5-next-20180720+ #12 ================================================================== Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline] BUG: KASAN: slab-out-of-bounds in pdu_read+0x90/0xd0 net/9p/protocol.c:59 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 Read of size 28771 at addr ffff8801949f08ad by task syz-executor6/21726 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0xa/0x11 lib/fault-inject.c:149 __should_failslab+0x124/0x180 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1557 slab_pre_alloc_hook mm/slab.h:423 [inline] slab_alloc mm/slab.c:3378 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3552 __build_skb+0xab/0x430 net/core/skbuff.c:281 __napi_alloc_skb+0x19a/0x2d0 net/core/skbuff.c:482 napi_alloc_skb include/linux/skbuff.h:2655 [inline] napi_get_frags+0x67/0x140 net/core/dev.c:5610 tun_napi_alloc_frags drivers/net/tun.c:1493 [inline] tun_get_user+0x1e36/0x42c0 drivers/net/tun.c:1835 tun_chr_write_iter+0xb9/0x154 drivers/net/tun.c:2009 call_write_iter include/linux/fs.h:1826 [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: 0033:0x455971 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 54 bb fb ff c3 48 83 ec 08 e8 da 2c 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 23 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f45eff56ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000000036 RCX: 0000000000455971 RDX: 0000000000000001 RSI: 00007f45eff56bf0 RDI: 00000000000000fc RBP: 0000000020000000 R08: 00000000000000fc R09: 0000000000000000 R10: 0000000000000036 R11: 0000000000000293 R12: 0000000000000014 R13: 00000000004c20a6 R14: 00000000004d3ae0 R15: 0000000000000000 CPU: 0 PID: 21726 Comm: syz-executor6 Not tainted 4.18.0-rc5-next-20180720+ #12 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:345 [inline] pdu_read+0x90/0xd0 net/9p/protocol.c:59 p9pdu_vreadf net/9p/protocol.c:162 [inline] p9pdu_readf+0x579/0x2170 net/9p/protocol.c:536 binder: 21777:21781 transaction failed 29189/-22, size 0-0 line 2852 p9_client_version net/9p/client.c:900 [inline] p9_client_create+0x6d0/0x1537 net/9p/client.c:974 binder: undelivered TRANSACTION_ERROR: 29189 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 legacy_get_tree+0x131/0x460 fs/fs_context.c:674 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1743 do_new_mount fs/namespace.c:2603 [inline] do_mount+0x6f2/0x1e20 fs/namespace.c:2927 ksys_mount+0x12d/0x140 fs/namespace.c:3143 __do_sys_mount fs/namespace.c:3157 [inline] __se_sys_mount fs/namespace.c:3154 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3154 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa567225c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa5672266d4 RCX: 0000000000455ab9 RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000072bea0 R08: 0000000020000280 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0201 R14: 00000000004cfe50 R15: 0000000000000000 Allocated by task 21726: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] p9_fcall_alloc+0x1e/0x90 net/9p/client.c:237 p9_tag_alloc net/9p/client.c:267 [inline] p9_client_prepare_req.part.8+0x132/0xa00 net/9p/client.c:640 p9_client_prepare_req net/9p/client.c:675 [inline] p9_client_rpc+0x242/0x1330 net/9p/client.c:675 p9_client_version net/9p/client.c:890 [inline] p9_client_create+0xca4/0x1537 net/9p/client.c:974 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 legacy_get_tree+0x131/0x460 fs/fs_context.c:674 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1743 do_new_mount fs/namespace.c:2603 [inline] do_mount+0x6f2/0x1e20 fs/namespace.c:2927 ksys_mount+0x12d/0x140 fs/namespace.c:3143 __do_sys_mount fs/namespace.c:3157 [inline] __se_sys_mount fs/namespace.c:3154 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3154 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 20428: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 skb_release_data+0x6a4/0x880 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb+0x193/0x560 net/core/skbuff.c:701 skb_free_datagram+0x1a/0xf0 net/core/datagram.c:329 netlink_recvmsg+0x70f/0x1490 net/netlink/af_netlink.c:1980 sock_recvmsg_nosec net/socket.c:796 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:803 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2269 __sys_recvmsg+0x11a/0x290 net/socket.c:2318 __do_sys_recvmsg net/socket.c:2328 [inline] __se_sys_recvmsg net/socket.c:2325 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2325 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801949f0880 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 45 bytes inside of 16384-byte region [ffff8801949f0880, ffff8801949f4880) The buggy address belongs to the page: page:ffffea0006527c00 count:1 mapcount:0 mapping:ffff8801da802200 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea000667ba08 ffffea0006404c08 ffff8801da802200 raw: 0000000000000000 ffff8801949f0880 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801949f2780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801949f2800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801949f2880: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801949f2900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801949f2980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================