DMA free:10380kB min:220kB low:272kB high:324kB active_anon:168kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:64kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB ================================================================== lowmem_reserve[]: BUG: KASAN: use-after-free in ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 Read of size 8 at addr ffff888045f86b90 by task syz-executor.1/9910 CPU: 1 PID: 9910 Comm: syz-executor.1 Not tainted 4.14.184-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+0x54/0x1dc 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+0xa9/0x2b9 mm/kasan/report.c:393 ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 0 ceph_mount+0xd43/0x181c fs/ceph/super.c:1036 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x25e0 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: 0033:0x45ca59 2559 RSP: 002b:00007ff5011a9c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6be0 RCX: 000000000045ca59 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 00000000200005c0 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000768 R14: 00000000004ca5c0 R15: 00007ff5011aa6d4 Allocated by task 9910: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x14d/0x3f0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] ceph_parse_options+0xb8/0xe50 net/ceph/ceph_common.c:349 parse_mount_options fs/ceph/super.c:501 [inline] ceph_mount+0x44f/0x181c fs/ceph/super.c:1025 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 2559 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x25e0 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 9910: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xaf/0x190 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 ceph_destroy_client+0x90/0xb0 net/ceph/ceph_common.c:671 create_fs_client fs/ceph/super.c:684 [inline] ceph_mount+0xd1c/0x181c fs/ceph/super.c:1032 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x25e0 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 ffff888045f86ac0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 208 bytes inside of 256-byte region [ffff888045f86ac0, ffff888045f86bc0) The buggy address belongs to the page: 2559 page:ffffea000117e180 count:1 mapcount:0 mapping:ffff888045f860c0 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff888045f860c0 0000000000000000 000000010000000c raw: ffffea00023c87a0 ffffea0001741760 ffff8880aa8007c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888045f86a80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888045f86b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888045f86b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888045f86c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888045f86c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== (null) 2559 , order=3, oom_score_adj=0 syz-executor.4 cpuset= Node 0 / DMA32 free:51412kB min:36296kB low:45368kB high:54440kB active_anon:1545680kB inactive_anon:58908kB active_file:292kB inactive_file:1420kB unevictable:16156kB writepending:208kB present:3129332kB managed:2623992kB mlocked:16156kB kernel_stack:16416kB pagetables:60404kB bounce:0kB free_pcp:528kB local_pcp:288kB free_cma:0kB mems_allowed=0-1 lowmem_reserve[]: CPU: 1 PID: 13828 Comm: syz-executor.4 Tainted: G B 4.14.184-syzkaller #0 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 dump_header+0x178/0x7aa mm/oom_kill.c:422 oom_kill_process.cold+0x10/0xc16 mm/oom_kill.c:861 out_of_memory mm/oom_kill.c:1084 [inline] out_of_memory+0x2d5/0x10f0 mm/oom_kill.c:1023 0 __alloc_pages_may_oom mm/page_alloc.c:3345 [inline] __alloc_pages_slowpath mm/page_alloc.c:4034 [inline] __alloc_pages_nodemask+0x2556/0x2730 mm/page_alloc.c:4199 __alloc_pages include/linux/gfp.h:484 [inline] __alloc_pages_node include/linux/gfp.h:497 [inline] alloc_pages_node include/linux/gfp.h:511 [inline] alloc_thread_stack_node kernel/fork.c:236 [inline] dup_task_struct kernel/fork.c:519 [inline] copy_process.part.0+0x26a/0x6fa0 kernel/fork.c:1611 0 copy_process kernel/fork.c:1586 [inline] _do_fork+0x180/0xc80 kernel/fork.c:2070