IPVS: Creating netns size=2536 id=8 ================================================================== BUG: KASAN: use-after-free in disk_unblock_events+0x51/0x60 block/genhd.c:1550 at addr ffff8801c63f62e0 Read of size 8 by task blkid/7914 CPU: 1 PID: 7914 Comm: blkid Not tainted 4.9.58-g3861f0b #75 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801c97f7760 ffffffff81d91149 ffff8801da002000 ffff8801c63f5d80 ffff8801c63f6580 ffffed0038c7ec5c ffff8801c63f62e0 ffff8801c97f7788 ffffffff8153c01c ffffed0038c7ec5c ffff8801da002000 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160 [] print_address_description mm/kasan/report.c:198 [inline] [] kasan_report_error mm/kasan/report.c:287 [inline] [] kasan_report.part.1+0x21c/0x500 mm/kasan/report.c:309 [] kasan_report mm/kasan/report.c:330 [inline] [] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330 [] disk_unblock_events+0x51/0x60 block/genhd.c:1550 [] __blkdev_get+0x4b5/0xd50 fs/block_dev.c:1360 [] blkdev_get+0x33b/0x960 fs/block_dev.c:1416 [] blkdev_open+0x1a5/0x250 fs/block_dev.c:1571 [] do_dentry_open+0x607/0xc60 fs/open.c:766 [] vfs_open+0x105/0x220 fs/open.c:879 [] do_last fs/namei.c:3402 [inline] [] path_openat+0x5ac/0x2910 fs/namei.c:3525 [] do_filp_open+0x197/0x290 fs/namei.c:3560 [] do_sys_open+0x352/0x4c0 fs/open.c:1072 [] SYSC_open fs/open.c:1090 [inline] [] SyS_open+0x2d/0x40 fs/open.c:1085 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Object at ffff8801c63f5d80, in cache kmalloc-2048 size: 2048 Allocated: PID = 7881 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 kmem_cache_alloc_trace+0xfb/0x2a0 mm/slub.c:2742 kmem_cache_alloc_node_trace include/linux/slab.h:381 [inline] kmalloc_node include/linux/slab.h:528 [inline] kzalloc_node include/linux/slab.h:647 [inline] alloc_disk_node+0x54/0x3b0 block/genhd.c:1294 alloc_disk+0x18/0x20 block/genhd.c:1286 loop_add+0x324/0x770 drivers/block/loop.c:1769 loop_probe+0x155/0x180 drivers/block/loop.c:1876 kobj_lookup+0x2ac/0x410 drivers/base/map.c:124 get_gendisk+0x37/0x2d0 block/genhd.c:716 __blkdev_get+0x34f/0xd50 fs/block_dev.c:1262 blkdev_get+0x33b/0x960 fs/block_dev.c:1416 blkdev_open+0x1a5/0x250 fs/block_dev.c:1571 do_dentry_open+0x607/0xc60 fs/open.c:766 vfs_open+0x105/0x220 fs/open.c:879 do_last fs/namei.c:3402 [inline] path_openat+0x5ac/0x2910 fs/namei.c:3525 do_filp_open+0x197/0x290 fs/namei.c:3560 do_sys_open+0x352/0x4c0 fs/open.c:1072 SYSC_open fs/open.c:1090 [inline] SyS_open+0x2d/0x40 fs/open.c:1085 entry_SYSCALL_64_fastpath+0x23/0xc6 Freed: PID = 7914 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:495 set_track mm/kasan/kasan.c:507 [inline] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xf0/0x2f0 mm/slub.c:3878 disk_release+0x259/0x330 block/genhd.c:1147 device_release+0x7c/0x210 drivers/base/core.c:247 kobject_cleanup lib/kobject.c:645 [inline] kobject_release+0xed/0x1a0 lib/kobject.c:674 kref_sub include/linux/kref.h:73 [inline] kref_put include/linux/kref.h:98 [inline] kobject_put+0x63/0xc0 lib/kobject.c:691 put_disk+0x23/0x30 block/genhd.c:1358 __blkdev_get+0x415/0xd50 fs/block_dev.c:1353 blkdev_get+0x33b/0x960 fs/block_dev.c:1416 blkdev_open+0x1a5/0x250 fs/block_dev.c:1571 do_dentry_open+0x607/0xc60 fs/open.c:766 vfs_open+0x105/0x220 fs/open.c:879 do_last fs/namei.c:3402 [inline] path_openat+0x5ac/0x2910 fs/namei.c:3525 do_filp_open+0x197/0x290 fs/namei.c:3560 do_sys_open+0x352/0x4c0 fs/open.c:1072 SYSC_open fs/open.c:1090 [inline] SyS_open+0x2d/0x40 fs/open.c:1085 entry_SYSCALL_64_fastpath+0x23/0xc6 Memory state around the buggy address: ffff8801c63f6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c63f6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801c63f6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c63f6300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c63f6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================