Node 1 active_anon:3308172kB inactive_anon:16424kB active_file:3628kB inactive_file:4124kB unevictable:6132kB isolated(anon):0kB isolated(file):128kB mapped:19080kB dirty:12kB writeback:40kB shmem:23628kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no ================================================================== BUG: KASAN: use-after-free in ceph_destroy_options+0xda/0x100 net/ceph/ceph_common.c:283 Read of size 8 at addr ffff8880a0c410d0 by task syz-executor.1/19519 CPU: 0 PID: 19519 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 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 RSP: 002b:00007f768de47c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6ca0 RCX: 000000000045ca59 RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000020000480 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000768 R14: 00000000004ca5c0 R15: 00007f768de486d4 Allocated by task 19519: 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 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 19519: 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 ffff8880a0c41000 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 208 bytes inside of 256-byte region [ffff8880a0c41000, ffff8880a0c41100) The buggy address belongs to the page: page:ffffea0002831040 count:1 mapcount:0 mapping:ffff8880a0c41000 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff8880a0c41000 0000000000000000 000000010000000c raw: ffffea0002911b60 ffffea00026cef20 ffff8880aa8007c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a0c40f80: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a0c41000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a0c41080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a0c41100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff8880a0c41180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== Node 0 DMA free:10392kB min:220kB low:272kB high:324kB active_anon:4484kB inactive_anon:0kB active_file:0kB inactive_file:4kB unevictable:0kB writepending:12kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:152kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 2559 2559 2559 2559 Node 0 DMA32 free:27528kB min:36296kB low:45368kB high:54440kB active_anon:1837576kB inactive_anon:16164kB active_file:140kB inactive_file:276kB unevictable:4kB writepending:136kB present:3129332kB managed:2623992kB mlocked:4kB kernel_stack:12096kB pagetables:41816kB bounce:0kB free_pcp:76kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 0 Node 0 Normal free:0kB min:0kB low:0kB high:0kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:786432kB managed:0kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 0 Node 1 Normal free:52264kB min:53592kB low:66988kB high:80384kB active_anon:3312400kB inactive_anon:16428kB active_file:3420kB inactive_file:3168kB unevictable:6132kB writepending:144kB present:3932160kB managed:3870192kB mlocked:6132kB kernel_stack:27424kB pagetables:76764kB bounce:0kB free_pcp:192kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 0 Node 0 DMA: 6*4kB (UM) 35*8kB (UMEH) 27*16kB (UMEH) 12*32kB (UEH) 5*64kB (UMH) 8*128kB (ME) 7*256kB (UMEH) 4*512kB (UMEH) 4*1024kB (UMEH) 0*2048kB 0*4096kB = 10400kB Node 0 DMA32: 429*4kB (UME) 431*8kB (UME) 444*16kB (UME) 70*32kB (UME) 95*64kB (UME) 29*128kB (UME) 5*256kB (UM) 1*512kB (M) 2*1024kB (UM) 0*2048kB 0*4096kB = 28140kB Node 0 Normal: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB Node 1 Normal: 791*4kB (UMEH) 137*8kB (UMEH) 1308*16kB (UMEH) 890*32kB (UMEH) 5*64kB (UH) 1*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 54116kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB 11146 total pagecache pages 0 pages in swap cache Swap cache stats: add 0, delete 0, find 0/0 Free swap = 0kB Total swap = 0kB 1965979 pages RAM 0 pages HighMem/MovableOnly 338456 pages reserved 0 pages cma reserved