batman_adv: batadv0: Interface activated: batadv_slave_1 IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1_vlan: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369 Read of size 8 at addr ffff8880b4252f20 by task vhost-9371/9375 CPU: 1 PID: 9375 Comm: vhost-9371 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] ptr_ring_consume_batched include/linux/ptr_ring.h:361 [inline] skb_array_consume_batched include/linux/skb_array.h:103 [inline] vhost_net_buf_produce drivers/vhost/net.c:167 [inline] vhost_net_buf_peek+0x1ee/0x640 drivers/vhost/net.c:190 peek_head_len drivers/vhost/net.c:593 [inline] vhost_net_rx_peek_head_len drivers/vhost/net.c:623 [inline] handle_rx+0x377/0x1710 drivers/vhost/net.c:780 vhost_worker+0x267/0x450 drivers/vhost/vhost.c:364 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 9371: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] sk_prot_alloc+0x1ba/0x290 net/core/sock.c:1484 sk_alloc+0x36/0xcd0 net/core/sock.c:1538 tun_chr_open+0x7b/0x540 drivers/net/tun.c:2696 misc_open+0x337/0x460 drivers/char/misc.c:154 chrdev_open+0x23c/0x6d0 fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 9366: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 sk_prot_free net/core/sock.c:1521 [inline] __sk_destruct+0x5e3/0x760 net/core/sock.c:1600 sk_destruct net/core/sock.c:1615 [inline] __sk_free+0xd9/0x2d0 net/core/sock.c:1623 sk_free+0x2b/0x40 net/core/sock.c:1634 sock_put include/net/sock.h:1664 [inline] __tun_detach+0x963/0xf60 drivers/net/tun.c:587 tun_detach drivers/net/tun.c:594 [inline] tun_chr_close+0x41/0x60 drivers/net/tun.c:2732 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880b4252940 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1504 bytes inside of 2048-byte region [ffff8880b4252940, ffff8880b4253140) The buggy address belongs to the page: page:ffffea0002d09480 count:1 mapcount:0 mapping:ffff8880b42520c0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880b42520c0 0000000000000000 0000000100000003 raw: ffffea000264d9a0 ffffea0002cf5220 ffff88813fe74c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b4252e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880b4252e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880b4252f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880b4252f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880b4253000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================