1965979 pages RAM
0 pages HighMem/MovableOnly
335869 pages reserved
0 pages cma reserved
==================================================================
BUG: KASAN: use-after-free in ceph_destroy_options+0xe9/0x110 net/ceph/ceph_common.c:283
Read of size 8 at addr ffff888098171b90 by task syz-executor.4/18810

CPU: 0 PID: 18810 Comm: syz-executor.4 Not tainted 4.14.167-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+0x142/0x197 lib/dump_stack.c:58
 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 ceph_destroy_options+0xe9/0x110 net/ceph/ceph_common.c:283
 ceph_mount+0xb6b/0x1660 fs/ceph/super.c:1018
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b349
RSP: 002b:00007f51ad8f5c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f51ad8f66d4 RCX: 000000000045b349
RDX: 0000000020000000 RSI: 0000000020000080 RDI: 0000000020000380
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000725 R14: 00000000004c8a46 R15: 000000000075bf2c

Allocated by task 18810:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
 kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 ceph_parse_options+0xb8/0xe80 net/ceph/ceph_common.c:349
 parse_mount_options fs/ceph/super.c:475 [inline]
 ceph_mount+0x3c1/0x1660 fs/ceph/super.c:1007
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 18810:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x45/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xcc/0x270 mm/slab.c:3815
 ceph_destroy_options+0xdc/0x110 net/ceph/ceph_common.c:289
 ceph_destroy_client+0x9d/0xc0 net/ceph/ceph_common.c:671
 create_fs_client fs/ceph/super.c:658 [inline]
 ceph_mount+0xb44/0x1660 fs/ceph/super.c:1014
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff888098171ac0
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 208 bytes inside of
 256-byte region [ffff888098171ac0, ffff888098171bc0)
The buggy address belongs to the page:
page:ffffea0002605c40 count:1 mapcount:0 mapping:ffff8880981710c0 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff8880981710c0 0000000000000000 000000010000000c
raw: ffffea00013d5060 ffffea0002991620 ffff8880aa8007c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888098171a80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff888098171b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888098171b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                         ^
 ffff888098171c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888098171c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================