================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:193 [inline] BUG: KASAN: use-after-free in lockdep_register_key+0x3b9/0x490 kernel/locking/lockdep.c:1023 Read of size 8 at addr ffff8880a841be18 by task syz-executor.1/5084 CPU: 0 PID: 5084 Comm: syz-executor.1 Not tainted 5.0.0+ #16 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __read_once_size include/linux/compiler.h:193 [inline] lockdep_register_key+0x3b9/0x490 kernel/locking/lockdep.c:1023 wq_init_lockdep kernel/workqueue.c:3444 [inline] alloc_workqueue+0x427/0xe70 kernel/workqueue.c:4263 xfs_init_mount_workqueues+0x20c/0x660 fs/xfs/xfs_super.c:856 xfs_fs_fill_super+0x749/0x1670 fs/xfs/xfs_super.c:1658 mount_bdev+0x307/0x3c0 fs/super.c:1159 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1834 mount_fs+0x106/0x3ff fs/super.c:1258 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:959 vfs_kern_mount fs/namespace.c:949 [inline] do_new_mount fs/namespace.c:2515 [inline] do_mount+0x581/0x2d30 fs/namespace.c:2847 ksys_mount+0xdb/0x150 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a99a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 2d 8e fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 0a 8e fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f085f322a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f085f322b30 RCX: 000000000045a99a RDX: 00007f085f322ad0 RSI: 0000000020000180 RDI: 00007f085f322af0 RBP: 0000000020000180 R08: 00007f085f322b30 R09: 00007f085f322ad0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000004dbee0 R15: 00000000ffffffff Allocated by task 7396: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511 __do_kmalloc_node mm/slab.c:3686 [inline] __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3700 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:140 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1011 [inline] alloc_skb_with_frags+0x93/0x580 net/core/skbuff.c:5287 sock_alloc_send_pskb+0x72d/0x8a0 net/core/sock.c:2220 unix_dgram_sendmsg+0x3de/0x11e0 net/unix/af_unix.c:1630 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1809 __do_sys_sendto net/socket.c:1821 [inline] __se_sys_sendto net/socket.c:1817 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1817 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3875: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3821 skb_free_head+0x93/0xb0 net/core/skbuff.c:557 skb_release_data+0x576/0x7a0 net/core/skbuff.c:577 skb_release_all+0x4d/0x60 net/core/skbuff.c:631 __kfree_skb net/core/skbuff.c:645 [inline] consume_skb net/core/skbuff.c:705 [inline] consume_skb+0xe2/0x380 net/core/skbuff.c:699 skb_free_datagram+0x1b/0x100 net/core/datagram.c:329 unix_dgram_recvmsg+0x8a5/0xef0 net/unix/af_unix.c:2132 sock_recvmsg_nosec net/socket.c:817 [inline] sock_recvmsg net/socket.c:824 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:820 __sys_recvfrom+0x1ff/0x350 net/socket.c:1866 __do_sys_recvfrom net/socket.c:1884 [inline] __se_sys_recvfrom net/socket.c:1880 [inline] __x64_sys_recvfrom+0xe1/0x1a0 net/socket.c:1880 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a841bd00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 280 bytes inside of 512-byte region [ffff8880a841bd00, ffff8880a841bf00) The buggy address belongs to the page: page:ffffea0002a106c0 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0xffff8880a841b080 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00021ed1c8 ffffea0002520808 ffff88812c3f0940 raw: ffff8880a841b080 ffff8880a841b080 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a841bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a841bd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a841be00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a841be80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a841bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================