INFO: trying to register non-static key. ================================================================== BUG: KASAN: use-after-free in __collect_expired_timers include/linux/list.h:729 [inline] BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1569 [inline] BUG: KASAN: use-after-free in __run_timers+0xa2e/0xb90 kernel/time/timer.c:1616 Write of size 8 at addr ffff88005282bc08 by task syz-executor4/4033 CPU: 3 PID: 4033 Comm: syz-executor4 Not tainted 4.13.0-rc7-next-20170829+ #11 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x24e/0x340 mm/kasan/report.c:409 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435 __collect_expired_timers include/linux/list.h:729 [inline] collect_expired_timers kernel/time/timer.c:1569 [inline] __run_timers+0xa2e/0xb90 kernel/time/timer.c:1616 run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646 __do_softirq+0x2bd/0xbd4 kernel/softirq.c:284 invoke_softirq kernel/softirq.c:364 [inline] irq_exit+0x1d3/0x210 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:1044 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577 RIP: 0010:__read_once_size include/linux/compiler.h:276 [inline] RIP: 0010:compound_head include/linux/page-flags.h:146 [inline] RIP: 0010:virt_to_head_page include/linux/mm.h:605 [inline] RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:127 [inline] RIP: 0010:qlist_free_all+0x12f/0x160 mm/kasan/quarantine.c:163 RSP: 0018:ffff8800537efac8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: ffff88006d1a8ac0 RBX: 0000000000000286 RCX: ffffea0001a056e0 RDX: ffffea0001b46a00 RSI: ffff88006b222c58 RDI: 0000000000000286 RBP: ffff8800537efb00 R08: ffff8800537ef3a8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88006d1a8ac0 R15: ffffffff85ac97a0 quarantine_reduce+0x141/0x170 mm/kasan/quarantine.c:259 kasan_kmalloc+0xca/0xe0 mm/kasan/kasan.c:536 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 slab_post_alloc_hook mm/slab.h:444 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc+0x11b/0x760 mm/slab.c:3559 sock_alloc_inode+0x70/0x300 net/socket.c:250 alloc_inode+0x65/0x180 fs/inode.c:208 new_inode_pseudo+0x69/0x190 fs/inode.c:890 sock_alloc+0x41/0x270 net/socket.c:565 __sock_create+0x148/0x850 net/socket.c:1226 sock_create net/socket.c:1302 [inline] SYSC_socket net/socket.c:1332 [inline] SyS_socket+0xeb/0x200 net/socket.c:1312 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x446749 RSP: 002b:00007fa8fc152c08 EFLAGS: 00000286 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000000446749 RDX: 000000000000003c RSI: 0000000000000003 RDI: 000000000000000a RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 00000000ffffffff R13: 0000000000004780 R14: 00000000006e6840 R15: 0000000000000029 Allocated by task 3217: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3696 kmalloc_node include/linux/slab.h:535 [inline] kvmalloc_node+0x64/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:529 [inline] kvzalloc include/linux/mm.h:537 [inline] alloc_netdev_mqs+0x16e/0xed0 net/core/dev.c:8010 tun_set_iff drivers/net/tun.c:2008 [inline] __tun_chr_ioctl+0x12be/0x3d20 drivers/net/tun.c:2262 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2507 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 3217: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kfree+0xca/0x250 mm/slab.c:3820 kvfree+0x36/0x60 mm/util.c:416 netdev_freemem net/core/dev.c:7962 [inline] free_netdev+0x2cf/0x360 net/core/dev.c:8124 tun_set_iff drivers/net/tun.c:2091 [inline] __tun_chr_ioctl+0x2cf6/0x3d20 drivers/net/tun.c:2262 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2507 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe The buggy address belongs to the object at ffff880052828800 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 13320 bytes inside of 16384-byte region [ffff880052828800, ffff88005282c800) The buggy address belongs to the page: page:ffffea00014a0a00 count:1 mapcount:0 mapping:ffff880052828800 index:0xffff880052828800 compound_mapcount: 0 flags: 0x500000000008100(slab|head) raw: 0500000000008100 ffff880052828800 ffff880052828800 0000000100000000 raw: ffffea00014d9a20 ffff88006d800c60 ffff88003e802200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88005282bb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88005282bb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88005282bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88005282bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88005282bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================