IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready batman_adv: batadv0: Interface activated: batadv_slave_1 IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready ================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline] BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:45 [inline] BUG: KASAN: use-after-free in __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:590 [inline] BUG: KASAN: use-after-free in rwsem_down_write_failed+0x5d7/0x6d0 kernel/locking/rwsem-xadd.c:617 Read of size 8 at addr ffff888082b76ad0 by task syz-executor.0/8725 CPU: 1 PID: 8725 Comm: syz-executor.0 Not tainted 4.14.196-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+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __read_once_size include/linux/compiler.h:183 [inline] atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline] atomic_long_read include/asm-generic/atomic-long.h:45 [inline] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:590 [inline] rwsem_down_write_failed+0x5d7/0x6d0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 inode_lock include/linux/fs.h:719 [inline] __sock_release+0x86/0x2b0 net/socket.c:601 sock_close+0x15/0x20 net/socket.c:1139 __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 RIP: 0033:0x45d5b9 RSP: 002b:00007ff130f6fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 RAX: 0000000000000000 RBX: 0000000000002ac0 RCX: 000000000045d5b9 RDX: 0000000000000005 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 000000000118cf88 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffed61d28ef R14: 00007ff130f709c0 R15: 000000000118cf4c Allocated by task 8725: 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 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552 sock_alloc_inode+0x19/0x250 net/socket.c:251 alloc_inode+0x5d/0x170 fs/inode.c:210 new_inode_pseudo+0x14/0xe0 fs/inode.c:899 sock_alloc+0x3c/0x270 net/socket.c:569 __sock_create+0x8a/0x620 net/socket.c:1239 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd1/0x1b0 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 8717: 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] kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758 destroy_inode+0xb9/0x110 fs/inode.c:267 iput_final fs/inode.c:1524 [inline] iput+0x458/0x7e0 fs/inode.c:1551 dentry_unlink_inode+0x25c/0x310 fs/dcache.c:387 __dentry_kill+0x320/0x550 fs/dcache.c:591 dentry_kill fs/dcache.c:632 [inline] dput.part.0+0x56f/0x710 fs/dcache.c:847 dput+0x1b/0x30 fs/dcache.c:811 __fput+0x445/0x7a0 fs/file_table.c:228 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 ffff888082b769c0 which belongs to the cache sock_inode_cache of size 1000 The buggy address is located 272 bytes inside of 1000-byte region [ffff888082b769c0, ffff888082b76da8) The buggy address belongs to the page: page:ffffea00020add80 count:1 mapcount:0 mapping:ffff888082b760c0 index:0xffff888082b76ffd flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff888082b760c0 ffff888082b76ffd 0000000100000003 raw: ffffea00020ae2a0 ffffea00020adde0 ffff8880a99bd900 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888082b76980: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888082b76a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888082b76a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888082b76b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888082b76b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================