XFS (loop0): Invalid superblock magic number XFS (loop6): Invalid superblock magic number IPVS: ftp: loaded support on port[0] = 21 XFS (loop4): Invalid superblock magic number ================================================================== BUG: KASAN: use-after-free in radix_tree_next_chunk+0xde1/0xdf0 lib/radix-tree.c:1733 Read of size 4 at addr ffff8801d9090cd0 by task syzkaller717579/4576 CPU: 0 PID: 4576 Comm: syzkaller717579 Not tainted 4.16.0-rc7+ #9 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+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 radix_tree_next_chunk+0xde1/0xdf0 lib/radix-tree.c:1733 XFS (loop5): Invalid superblock magic number radix_tree_gang_lookup_tag+0x36e/0x5e0 lib/radix-tree.c:1918 xfs_perag_get_tag+0x109/0x6c0 fs/xfs/libxfs/xfs_sb.c:88 xfs_reclaim_inodes_count+0x82/0xb0 fs/xfs/xfs_icache.c:1362 xfs_fs_nr_cached_objects+0x37/0x50 fs/xfs/xfs_super.c:1778 super_cache_count+0x96/0x280 fs/super.c:131 do_shrink_slab mm/vmscan.c:310 [inline] shrink_slab.part.46+0x30c/0xe80 mm/vmscan.c:475 shrink_slab+0x9d/0xb0 mm/vmscan.c:442 shrink_node+0x51e/0xf70 mm/vmscan.c:2556 shrink_zones mm/vmscan.c:2728 [inline] do_try_to_free_pages+0x383/0x1020 mm/vmscan.c:2790 try_to_free_mem_cgroup_pages+0x44d/0xb40 mm/vmscan.c:3079 reclaim_high.constprop.64+0x1e2/0x330 mm/memcontrol.c:1862 mem_cgroup_handle_over_high+0x8d/0x130 mm/memcontrol.c:1887 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x242/0x2f0 arch/x86/entry/common.c:166 prepare_exit_to_usermode+0x2d9/0x350 arch/x86/entry/common.c:196 retint_user+0x8/0x18 RIP: 0033:0x4019e9 RSP: 002b:00007ffde3c93e60 EFLAGS: 00010207 RAX: 0000000000000012 RBX: 0000000000000001 RCX: 0000000000442a29 RDX: 0000000000000012 RSI: 00000000004a48ac RDI: 0000000000000001 RBP: 00007ffde3c93f70 R08: 000000000090a880 R09: 0000000300000000 R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000001380 R15: 00007ffde3c93f98 Allocated by task 4520: 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:552 kmem_cache_alloc_trace+0x136/0x740 mm/slab.c:3608 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] xfs_fs_fill_super+0xd1/0x1220 fs/xfs/xfs_super.c:1579 mount_bdev+0x2b7/0x370 fs/super.c:1119 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1770 mount_fs+0x66/0x2d0 fs/super.c:1222 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2509 [inline] do_new_mount fs/namespace.c:2512 [inline] do_mount+0xea4/0x2bb0 fs/namespace.c:2842 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 4520: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3486 [inline] kfree+0xd9/0x260 mm/slab.c:3801 xfs_fs_fill_super+0x6c3/0x1220 fs/xfs/xfs_super.c:1734 mount_bdev+0x2b7/0x370 fs/super.c:1119 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1770 mount_fs+0x66/0x2d0 fs/super.c:1222 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2509 [inline] do_new_mount fs/namespace.c:2512 [inline] do_mount+0xea4/0x2bb0 fs/namespace.c:2842 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801d9090900 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 976 bytes inside of 4096-byte region [ffff8801d9090900, ffff8801d9091900) The buggy address belongs to the page: page:ffffea0007642400 count:1 mapcount:0 mapping:ffff8801d9090900 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801d9090900 0000000000000000 0000000100000001 raw: ffffea0007640020 ffffea0006b3e320 ffff8801dac00dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d9090b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d9090c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801d9090c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d9090d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d9090d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================