IPVS: ftp: loaded support on port[0] = 21 XFS (loop2): Invalid superblock magic number XFS (loop4): Invalid superblock magic number XFS (loop1): Invalid superblock magic number ================================================================== BUG: KASAN: use-after-free in radix_tree_next_chunk+0xf9f/0xfb0 lib/radix-tree.c:1720 Read of size 4 at addr ffff8801d9344f48 by task syzkaller119703/4552 CPU: 0 PID: 4552 Comm: syzkaller119703 Not tainted 4.16.0+ #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 XFS (loop3): Invalid superblock magic number kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 radix_tree_next_chunk+0xf9f/0xfb0 lib/radix-tree.c:1720 radix_tree_gang_lookup_tag+0x3d4/0x5f0 lib/radix-tree.c:1918 XFS (loop6): Invalid superblock magic number xfs_perag_get_tag+0x12d/0x7c0 fs/xfs/libxfs/xfs_sb.c:88 xfs_reclaim_inodes_count+0x82/0xb0 fs/xfs/xfs_icache.c:1383 XFS (loop5): Invalid superblock magic number xfs_fs_nr_cached_objects+0x37/0x50 fs/xfs/xfs_super.c:1809 super_cache_count+0x98/0x280 fs/super.c:132 do_shrink_slab mm/vmscan.c:355 [inline] shrink_slab.part.39+0x330/0xf90 mm/vmscan.c:512 XFS (loop7): Invalid superblock magic number shrink_slab+0xa1/0xc0 mm/vmscan.c:487 XFS (loop2): Invalid superblock magic number shrink_node+0x4f2/0x1740 mm/vmscan.c:2542 XFS (loop0): Invalid superblock magic number shrink_zones mm/vmscan.c:2775 [inline] do_try_to_free_pages+0x3c9/0x1240 mm/vmscan.c:2837 try_to_free_mem_cgroup_pages+0x475/0xc50 mm/vmscan.c:3127 memory_high_write+0x26e/0x2f0 mm/memcontrol.c:5124 cgroup_file_write+0x317/0x820 kernel/cgroup/cgroup.c:3429 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x10b/0x880 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 SYSC_write fs/read_write.c:610 [inline] SyS_write+0x24/0x30 fs/read_write.c:607 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4428f9 RSP: 002b:00007ffe0bfab5c8 EFLAGS: 00000217 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 00000000004428f9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe0bfab708 Allocated by task 4550: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] xfs_mount_alloc fs/xfs/xfs_super.c:1587 [inline] xfs_fs_fill_super+0xda/0x1480 fs/xfs/xfs_super.c:1620 mount_bdev+0x30c/0x3e0 fs/super.c:1165 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1801 mount_fs+0xae/0x328 fs/super.c:1268 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2517 [inline] do_mount+0x564/0x3070 fs/namespace.c:2847 ksys_mount+0x12d/0x140 fs/namespace.c:3063 SYSC_mount fs/namespace.c:3077 [inline] SyS_mount+0x35/0x50 fs/namespace.c:3074 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 4550: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 xfs_fs_fill_super+0x66a/0x1480 fs/xfs/xfs_super.c:1765 mount_bdev+0x30c/0x3e0 fs/super.c:1165 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1801 mount_fs+0xae/0x328 fs/super.c:1268 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2517 [inline] do_mount+0x564/0x3070 fs/namespace.c:2847 ksys_mount+0x12d/0x140 fs/namespace.c:3063 SYSC_mount fs/namespace.c:3077 [inline] SyS_mount+0x35/0x50 fs/namespace.c:3074 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801d9344b40 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 1032 bytes inside of 4096-byte region [ffff8801d9344b40, ffff8801d9345b40) The buggy address belongs to the page: page:ffffea000764d100 count:1 mapcount:0 mapping:ffff8801d9344b40 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801d9344b40 0000000000000000 0000000100000001 raw: ffffea00073d68a0 ffffea0007644920 ffff8801dac00dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d9344e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d9344e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801d9344f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d9344f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d9345000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================