2097051 pages RAM
0 pages HighMem/MovableOnly
363840 pages reserved
0 pages cma reserved
==================================================================
BUG: KASAN: use-after-free in ceph_destroy_options+0x10d/0x140 net/ceph/ceph_common.c:283
Read of size 8 at addr ffff88809b52ef10 by task syz-executor.0/2510

CPU: 1 PID: 2510 Comm: syz-executor.0 Not tainted 4.14.214-syzkaller #0
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+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 ceph_destroy_options+0x10d/0x140 net/ceph/ceph_common.c:283
 ceph_mount+0xdd9/0x1be0 fs/ceph/super.c:1036
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45e219
RSP: 002b:00007f7c0db05c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219
RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000020000480
RBP: 000000000119bfd0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffef59e27ff R14: 00007f7c0db069c0 R15: 000000000119bf8c

Allocated by task 2510:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 ceph_parse_options+0xb0/0xee0 net/ceph/ceph_common.c:349
 parse_mount_options fs/ceph/super.c:501 [inline]
 ceph_mount+0x639/0x1be0 fs/ceph/super.c:1025
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 2510:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 ceph_destroy_client+0xac/0x120 net/ceph/ceph_common.c:671
 create_fs_client fs/ceph/super.c:684 [inline]
 ceph_mount+0xdb2/0x1be0 fs/ceph/super.c:1032
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0xe53/0x2a00 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff88809b52ee40
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 208 bytes inside of
 256-byte region [ffff88809b52ee40, ffff88809b52ef40)
The buggy address belongs to the page:
page:ffffea00026d4b80 count:1 mapcount:0 mapping:ffff88809b52e080 index:0xffff88809b52e440
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff88809b52e080 ffff88809b52e440 0000000100000005
raw: ffffea0002a54ba0 ffffea000260c820 ffff88813fe807c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809b52ee00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff88809b52ee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809b52ef00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                         ^
 ffff88809b52ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809b52f000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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