IPVS: Creating netns size=2536 id=5 IPVS: Creating netns size=2536 id=6 IPVS: Creating netns size=2536 id=7 IPVS: Creating netns size=2536 id=8 ================================================================== BUG: KASAN: use-after-free in disk_unblock_events+0x51/0x60 block/genhd.c:1550 Read of size 8 at addr ffff8801b604c0e0 by task syz-executor2/3857 CPU: 0 PID: 3857 Comm: syz-executor2 Not tainted 4.9.94-g8683408 #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801b61bf6c8 ffffffff81d9b509 ffffea0006d81200 ffff8801b604c0e0 0000000000000000 ffff8801b604c0e0 0000000000000000 ffff8801b61bf700 ffffffff815652cb ffff8801b604c0e0 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 [] disk_unblock_events+0x51/0x60 block/genhd.c:1550 [] __blkdev_get+0x6b6/0xd60 fs/block_dev.c:1360 [] blkdev_get+0x2da/0x920 fs/block_dev.c:1416 [] blkdev_open+0x1a5/0x250 fs/block_dev.c:1571 [] do_dentry_open+0x703/0xc80 fs/open.c:766 [] vfs_open+0x11c/0x210 fs/open.c:879 [] do_last fs/namei.c:3409 [inline] [] path_openat+0x758/0x3590 fs/namei.c:3533 [] do_filp_open+0x197/0x270 fs/namei.c:3567 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 [] C_SYSC_open fs/compat.c:1081 [inline] [] compat_SyS_open+0x2a/0x40 fs/compat.c:1079 [] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline] [] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387 [] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 Allocated by task 3859: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609 kmem_cache_alloc_trace+0xfd/0x2b0 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+0x54/0x3a0 block/genhd.c:1294 alloc_disk+0x18/0x20 block/genhd.c:1286 loop_add+0x33b/0x770 drivers/block/loop.c:1778 loop_probe+0x14f/0x180 drivers/block/loop.c:1885 kobj_lookup+0x223/0x410 drivers/base/map.c:124 get_gendisk+0x39/0x2d0 block/genhd.c:716 __blkdev_get+0x351/0xd60 fs/block_dev.c:1262 blkdev_get+0x2da/0x920 fs/block_dev.c:1416 blkdev_open+0x1a5/0x250 fs/block_dev.c:1571 do_dentry_open+0x703/0xc80 fs/open.c:766 vfs_open+0x11c/0x210 fs/open.c:879 do_last fs/namei.c:3409 [inline] path_openat+0x758/0x3590 fs/namei.c:3533 do_filp_open+0x197/0x270 fs/namei.c:3567 do_sys_open+0x30d/0x5c0 fs/open.c:1072 C_SYSC_open fs/compat.c:1081 [inline] compat_SyS_open+0x2a/0x40 fs/compat.c:1079 do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387 entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 Freed by task 3857: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582 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+0xfb/0x310 mm/slub.c:3878 disk_release+0x259/0x330 block/genhd.c:1147 device_release+0x7e/0x220 drivers/base/core.c:247 kobject_cleanup lib/kobject.c:645 [inline] kobject_release+0x103/0x1b0 lib/kobject.c:674 kref_sub include/linux/kref.h:73 [inline] kref_put include/linux/kref.h:98 [inline] kobject_put+0x6d/0xd0 lib/kobject.c:691 put_disk+0x23/0x30 block/genhd.c:1358 __blkdev_get+0x616/0xd60 fs/block_dev.c:1353 blkdev_get+0x2da/0x920 fs/block_dev.c:1416 blkdev_open+0x1a5/0x250 fs/block_dev.c:1571 do_dentry_open+0x703/0xc80 fs/open.c:766 vfs_open+0x11c/0x210 fs/open.c:879 do_last fs/namei.c:3409 [inline] path_openat+0x758/0x3590 fs/namei.c:3533 do_filp_open+0x197/0x270 fs/namei.c:3567 do_sys_open+0x30d/0x5c0 fs/open.c:1072 C_SYSC_open fs/compat.c:1081 [inline] compat_SyS_open+0x2a/0x40 fs/compat.c:1079 do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387 entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 The buggy address belongs to the object at ffff8801b604bb80 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1376 bytes inside of 2048-byte region [ffff8801b604bb80, ffff8801b604c380) The buggy address belongs to the page: page:ffffea0006d81200 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x8000000000004080(slab|head) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b604bf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b604c000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801b604c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801b604c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b604c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================