Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
==================================================================
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:376 [inline]
BUG: KASAN: slab-out-of-bounds in pdu_read+0x94/0x100 net/9p/protocol.c:64
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc+0x28e/0x3c0 mm/slab.c:3550
Read of size 31743 at addr ffff88807dbe2e2d by task syz-executor.3/29740
 getname_flags+0xc8/0x550 fs/namei.c:138

 user_path_at_empty+0x2a/0x50 fs/namei.c:2631
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x118/0x2a10 fs/namespace.c:2842
 SYSC_mount fs/namespace.c:3118 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3095
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fba4cb64049
RSP: 002b:00007fba4b4b8168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fba4cc77030 RCX: 00007fba4cb64049
RDX: 0000000020000080 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007fba4b4b81d0 R08: 00000000200002c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffc858acff R14: 00007fba4b4b8300 R15: 0000000000022000
CPU: 0 PID: 29740 Comm: syz-executor.3 Not tainted 4.14.275-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+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report+0x6f/0x80 mm/kasan/report.c:409
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:376 [inline]
 pdu_read+0x94/0x100 net/9p/protocol.c:64
 p9pdu_vreadf net/9p/protocol.c:167 [inline]
 p9pdu_readf+0x381/0x1970 net/9p/protocol.c:540
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 p9_client_version net/9p/client.c:990 [inline]
 p9_client_create+0x9b2/0x12c0 net/9p/client.c:1088
 v9fs_session_init+0x1c5/0x1540 fs/9p/v9fs.c:422
 v9fs_mount+0x73/0x860 fs/9p/vfs_super.c:135
 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:2572 [inline]
 do_mount+0xe65/0x2a10 fs/namespace.c:2902
 SYSC_mount fs/namespace.c:3118 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3095
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fa01f301049
RSP: 002b:00007fa01dc76168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa01f413f60 RCX: 00007fa01f301049
RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007fa01f35b08d R08: 0000000020000080 R09: 0000000000000000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc8fa650df R14: 00007fa01dc76300 R15: 0000000000022000

Allocated by task 29740:
 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
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
CPU: 1 PID: 29754 Comm: syz-executor.2 Not tainted 4.14.275-syzkaller #0
 kmalloc include/linux/slab.h:493 [inline]
 p9_fcall_alloc+0x19/0x90 net/9p/client.c:242
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 p9_tag_alloc net/9p/client.c:312 [inline]
 p9_client_prepare_req.part.0+0x7f8/0xb60 net/9p/client.c:728
Call Trace:
 p9_client_prepare_req net/9p/client.c:718 [inline]
 p9_client_rpc+0x170/0x1520 net/9p/client.c:763
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 p9_client_version net/9p/client.c:980 [inline]
 p9_client_create+0x92f/0x12c0 net/9p/client.c:1088
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 v9fs_session_init+0x1c5/0x1540 fs/9p/v9fs.c:422
 v9fs_mount+0x73/0x860 fs/9p/vfs_super.c:135
 should_failslab+0xd6/0x130 mm/failslab.c:32
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc+0x28e/0x3c0 mm/slab.c:3550
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a10 fs/namespace.c:2902
 kmem_cache_zalloc include/linux/slab.h:651 [inline]
 alloc_vfsmnt+0x23/0x7f0 fs/namespace.c:205
 SYSC_mount fs/namespace.c:3118 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3095
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 vfs_kern_mount.part.0+0x27/0x470 fs/namespace.c:1039
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a10 fs/namespace.c:2902
Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88807dbe2e00
 which belongs to the cache kmalloc-16384 of size 16384
The buggy address is located 45 bytes inside of
 16384-byte region [ffff88807dbe2e00, ffff88807dbe6e00)
The buggy address belongs to the page:
page:ffffea0001f6f800 count:1 mapcount:0 mapping:ffff88807dbe2e00 index:0x0
 compound_mapcount: 0
 SYSC_mount fs/namespace.c:3118 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3095
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff88807dbe2e00 0000000000000000 0000000100000001
raw: ffffea0001ec9420 ffff88813fe64c48 ffff88813fe65200 0000000000000000
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
page dumped because: kasan: bad access detected
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

RIP: 0033:0x7f3209fec049
Memory state around the buggy address:
RSP: 002b:00007f3208961168 EFLAGS: 00000246
 ffff88807dbe4d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ORIG_RAX: 00000000000000a5
 ffff88807dbe4d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RAX: ffffffffffffffda RBX: 00007f320a0fef60 RCX: 00007f3209fec049
>ffff88807dbe4e00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
RDX: 0000000020000080 RSI: 0000000020000000 RDI: 0000000000000000
                               ^
 ffff88807dbe4e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
RBP: 00007f32089611d0 R08: 0000000000000000 R09: 0000000000000000
 ffff88807dbe4f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
==================================================================
R13: 00007ffe329dcb6f R14: 00007f3208961300 R15: 0000000000022000
CPU: 1 PID: 29757 Comm: syz-executor.4 Not tainted 4.14.275-syzkaller #0
9pnet: Insufficient options for proto=fd
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+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc+0x28e/0x3c0 mm/slab.c:3550
 getname_flags+0xc8/0x550 fs/namei.c:138
 user_path_at_empty+0x2a/0x50 fs/namei.c:2631
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x118/0x2a10 fs/namespace.c:2842