FAT-fs (loop5): Unrecognized mount option ":'M>yяWۯ u~ 7 A2'Ibinոcix@/W=[t@O y: m?l?ZTZ?m9GV|GUC6+DL<4/ UsGUf2\Q"eWJPqŧ:g(_`b %u3(cFX{nV" or missing value ================================================================== BUG: KASAN: use-after-free in __dev_queue_xmit+0x33f9/0x3950 net/core/dev.c:3772 Read of size 8 at addr ffff8801bc20f5c0 by task syz-executor4/12107 CPU: 0 PID: 12107 Comm: syz-executor4 Not tainted 4.19.0-rc5-next-20180928+ #84 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+0x1d3/0x2c4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __dev_queue_xmit+0x33f9/0x3950 net/core/dev.c:3772 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready dev_queue_xmit+0x17/0x20 net/core/dev.c:3838 neigh_resolve_output+0x67e/0xae0 net/core/neighbour.c:1364 neigh_output include/net/neighbour.h:483 [inline] ip6_finish_output2+0xc91/0x27a0 net/ipv6/ip6_output.c:120 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready ip6_finish_output+0x4de/0xbc0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip6_output+0x23e/0x9f0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ndisc_send_skb+0x1005/0x1570 net/ipv6/ndisc.c:491 ndisc_send_rs+0x134/0x6e0 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x314/0x690 net/ipv6/addrconf.c:3820 call_timer_fn+0x26d/0x920 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7e0/0xc60 kernel/time/timer.c:1682 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1695 __do_softirq+0x30b/0xb03 kernel/softirq.c:292 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1cb/0x750 arch/x86/kernel/apic/apic.c:1061 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804 RIP: 0010:arch_atomic_inc arch/x86/include/asm/atomic.h:97 [inline] RIP: 0010:atomic_inc include/asm-generic/atomic-instrumented.h:110 [inline] RIP: 0010:page_ref_inc include/linux/page_ref.h:107 [inline] RIP: 0010:get_page include/linux/mm.h:926 [inline] RIP: 0010:attach_page_buffers include/linux/buffer_head.h:276 [inline] RIP: 0010:create_empty_buffers+0x891/0xdb0 fs/buffer.c:1567 Code: 37 f8 e8 62 43 9e ff 8b 85 b0 fd ff ff 85 c0 0f 8e 88 02 00 00 e8 3f 42 9e ff be 04 00 00 00 48 89 df e8 02 e6 e1 ff f0 ff 03 <4c> 89 e0 48 c1 e8 03 42 80 3c 30 00 0f 85 cf 04 00 00 49 8b 1c 24 RSP: 0018:ffff88017fac6ed0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: fffff94000d5500f RBX: ffffea0006aa8074 RCX: ffffffff81df261e RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea0006aa8074 RBP: ffff88017fac7158 R08: fffff94000d5500f R09: fffff94000d5500e R10: fffff94000d5500e R11: ffffea0006aa8077 R12: ffffea0006aa8040 R13: ffffea0006aa8040 R14: dffffc0000000000 R15: 1ffff1002ff58de6 ext4_block_write_begin+0x11ed/0x1870 fs/ext4/inode.c:1174 ext4_da_write_begin+0x436/0x12c0 fs/ext4/inode.c:3078 generic_perform_write+0x3aa/0x6a0 mm/filemap.c:3154 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3279 ext4_file_write_iter+0x390/0x1420 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1825 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x6b8/0x9f0 fs/read_write.c:487 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcb7f0fdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 000000001c3968b2 RSI: 0000000020000100 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcb7f0fe6d4 R13: 00000000004c55ab R14: 00000000004d8ee0 R15: 00000000ffffffff Allocated by task 11588: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:551 [inline] sk_prot_alloc+0x1b0/0x2e0 net/core/sock.c:1468 sk_alloc+0x10d/0x1690 net/core/sock.c:1522 __netlink_create+0x6a/0x270 net/netlink/af_netlink.c:638 netlink_create+0x3a3/0x5d0 net/netlink/af_netlink.c:701 __sock_create+0x536/0x930 net/socket.c:1278 sock_create net/socket.c:1318 [inline] __sys_socket+0x106/0x260 net/socket.c:1348 __do_sys_socket net/socket.c:1357 [inline] __se_sys_socket net/socket.c:1355 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1355 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 16: save_stack+0x43/0xd0 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] kfree+0xcf/0x230 mm/slab.c:3813 sk_prot_free net/core/sock.c:1505 [inline] __sk_destruct+0x797/0xa80 net/core/sock.c:1587 sk_destruct+0x78/0x90 net/core/sock.c:1595 __sk_free+0xcf/0x300 net/core/sock.c:1606 sk_free+0x42/0x50 net/core/sock.c:1617 deferred_put_nlk_sk+0x164/0x350 net/netlink/af_netlink.c:738 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2437 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline] rcu_process_callbacks+0xff9/0x1ad0 kernel/rcu/tree.c:2697 __do_softirq+0x30b/0xb03 kernel/softirq.c:292 The buggy address belongs to the object at ffff8801bc20f5c0 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of 2048-byte region [ffff8801bc20f5c0, ffff8801bc20fdc0) The buggy address belongs to the page: page:ffffea0006f08380 count:1 mapcount:0 mapping:ffff8801da800c40 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea000605eb08 ffffea000754d188 ffff8801da800c40 raw: 0000000000000000 ffff8801bc20e4c0 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bc20f480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801bc20f500: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8801bc20f580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801bc20f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801bc20f680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================