KASAN: use-after-free Read in ceph_destroy_options
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syzbot
Apr 30, 2019, 7:53:06 PM4/30/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: fa5941f4 Linux 4.14.114
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=112fa514a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7780000df8e070e
dashboard link: https://syzkaller.appspot.com/bug?extid=d9a7c18769f25c93c630
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b1a0e0a00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d9a7c1...@syzkaller.appspotmail.com
syz-executor.3: page allocation failure: order:5, mode:0x14040c0(GFP_KERNEL|
__GFP_COMP), nodemask=(null)
syz-executor.4: page allocation failure: order:5, mode:0x14040c0(GFP_KERNEL|
__GFP_COMP), nodemask=(null)
page allocation failure: order:5, mode:0x14040c0(GFP_KERNEL|__GFP_COMP),
nodemask=(null)
syz-executor.4: page allocation failure: order:5, mode:0x14040c0(GFP_KERNEL|
__GFP_COMP), nodemask=(null)
==================================================================
BUG: KASAN: use-after-free in ceph_destroy_options+0xe9/0x110
net/ceph/ceph_common.c:283
Read of size 8 at addr ffff888087aaf290 by task syz-executor.1/10204
CPU: 1 PID: 10204 Comm: syz-executor.1 Not tainted 4.14.114 #4
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+0x138/0x19c lib/dump_stack.c:53
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+0xaf/0x2b5 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+0xb6d/0x1709 fs/ceph/super.c:1002
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458da9
RSP: 002b:00007f6977eedc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458da9
RDX: 0000000020000100 RSI: 0000000020000200 RDI: 0000000020000040
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6977eee6d4
R13: 00000000004c4da1 R14: 00000000004d8a08 R15: 00000000ffffffff
Allocated by task 10204:
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+0xb8/0xe90 net/ceph/ceph_common.c:349
parse_mount_options fs/ceph/super.c:466 [inline]
ceph_mount+0x3c1/0x1709 fs/ceph/super.c:991
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 10204:
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:649 [inline]
ceph_mount+0xb46/0x1709 fs/ceph/super.c:998
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff888087aaf1c0
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 208 bytes inside of
256-byte region [ffff888087aaf1c0, ffff888087aaf2c0)
The buggy address belongs to the page:
page:ffffea00021eabc0 count:1 mapcount:0 mapping:ffff888087aaf080 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff888087aaf080 0000000000000000 000000010000000c
raw: ffffea00024c4260 ffffea0001488460 ffff8880aa8007c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888087aaf180: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
ffff888087aaf200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff888087aaf280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff888087aaf300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888087aaf380: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: double-free or invalid-free in ceph_destroy_options+0xd4/0x110
net/ceph/ceph_common.c:288
CPU: 0 PID: 9986 Comm: syz-executor.0 Tainted: G B 4.14.114 #4
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+0x138/0x19c lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_double_free+0x56/0x80 mm/kasan/report.c:333
kasan_slab_free+0xa7/0xc0 mm/kasan/kasan.c:514
__cache_free mm/slab.c:3496 [inline]
kfree+0xcc/0x270 mm/slab.c:3815
ceph_destroy_options+0xd4/0x110 net/ceph/ceph_common.c:288
ceph_mount+0xb6d/0x1709 fs/ceph/super.c:1002
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458da9
RSP: 002b:00007f3ae1dcfc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458da9
RDX: 0000000020000100 RSI: 0000000020000200 RDI: 0000000020000040
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3ae1dd06d4
R13: 00000000004c4da1 R14: 00000000004d8a08 R15: 00000000ffffffff
Allocated by task 9986:
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]
kmalloc_array include/linux/slab.h:606 [inline]
kcalloc include/linux/slab.h:618 [inline]
ceph_parse_options+0xfe/0xe90 net/ceph/ceph_common.c:352
parse_mount_options fs/ceph/super.c:466 [inline]
ceph_mount+0x3c1/0x1709 fs/ceph/super.c:991
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 9986:
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+0xd4/0x110 net/ceph/ceph_common.c:288
ceph_destroy_client+0x9d/0xc0 net/ceph/ceph_common.c:671
create_fs_client fs/ceph/super.c:649 [inline]
ceph_mount+0xb46/0x1709 fs/ceph/super.c:998
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff8881cdf40e00
which belongs to the cache kmalloc-8192 of size 8192
The buggy address is located 0 bytes inside of
8192-byte region [ffff8881cdf40e00, ffff8881cdf42e00)
The buggy address belongs to the page:
page:ffffea000737d000 count:1 mapcount:0 mapping:ffff8881cdf40e00 index:0x0
compound_mapcount: 0
flags: 0x6fffc0000008100(slab|head)
raw: 06fffc0000008100 ffff8881cdf40e00 0000000000000000 0000000100000001
raw: ffffea0007669120 ffffea00071f5220 ffff8880aa802080 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881cdf40d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881cdf40d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881cdf40e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881cdf40e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881cdf40f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following crash on:
HEAD commit: fa5941f4 Linux 4.14.114
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=112fa514a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7780000df8e070e
dashboard link: https://syzkaller.appspot.com/bug?extid=d9a7c18769f25c93c630
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b1a0e0a00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d9a7c1...@syzkaller.appspotmail.com
syz-executor.3: page allocation failure: order:5, mode:0x14040c0(GFP_KERNEL|
__GFP_COMP), nodemask=(null)
syz-executor.4: page allocation failure: order:5, mode:0x14040c0(GFP_KERNEL|
__GFP_COMP), nodemask=(null)
page allocation failure: order:5, mode:0x14040c0(GFP_KERNEL|__GFP_COMP),
nodemask=(null)
syz-executor.4: page allocation failure: order:5, mode:0x14040c0(GFP_KERNEL|
__GFP_COMP), nodemask=(null)
==================================================================
BUG: KASAN: use-after-free in ceph_destroy_options+0xe9/0x110
net/ceph/ceph_common.c:283
Read of size 8 at addr ffff888087aaf290 by task syz-executor.1/10204
CPU: 1 PID: 10204 Comm: syz-executor.1 Not tainted 4.14.114 #4
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+0x138/0x19c lib/dump_stack.c:53
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+0xaf/0x2b5 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+0xb6d/0x1709 fs/ceph/super.c:1002
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458da9
RSP: 002b:00007f6977eedc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458da9
RDX: 0000000020000100 RSI: 0000000020000200 RDI: 0000000020000040
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6977eee6d4
R13: 00000000004c4da1 R14: 00000000004d8a08 R15: 00000000ffffffff
Allocated by task 10204:
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+0xb8/0xe90 net/ceph/ceph_common.c:349
parse_mount_options fs/ceph/super.c:466 [inline]
ceph_mount+0x3c1/0x1709 fs/ceph/super.c:991
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 10204:
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:649 [inline]
ceph_mount+0xb46/0x1709 fs/ceph/super.c:998
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff888087aaf1c0
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 208 bytes inside of
256-byte region [ffff888087aaf1c0, ffff888087aaf2c0)
The buggy address belongs to the page:
page:ffffea00021eabc0 count:1 mapcount:0 mapping:ffff888087aaf080 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff888087aaf080 0000000000000000 000000010000000c
raw: ffffea00024c4260 ffffea0001488460 ffff8880aa8007c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888087aaf180: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
ffff888087aaf200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff888087aaf280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff888087aaf300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888087aaf380: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: double-free or invalid-free in ceph_destroy_options+0xd4/0x110
net/ceph/ceph_common.c:288
CPU: 0 PID: 9986 Comm: syz-executor.0 Tainted: G B 4.14.114 #4
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+0x138/0x19c lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_double_free+0x56/0x80 mm/kasan/report.c:333
kasan_slab_free+0xa7/0xc0 mm/kasan/kasan.c:514
__cache_free mm/slab.c:3496 [inline]
kfree+0xcc/0x270 mm/slab.c:3815
ceph_destroy_options+0xd4/0x110 net/ceph/ceph_common.c:288
ceph_mount+0xb6d/0x1709 fs/ceph/super.c:1002
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458da9
RSP: 002b:00007f3ae1dcfc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000458da9
RDX: 0000000020000100 RSI: 0000000020000200 RDI: 0000000020000040
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3ae1dd06d4
R13: 00000000004c4da1 R14: 00000000004d8a08 R15: 00000000ffffffff
Allocated by task 9986:
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]
kmalloc_array include/linux/slab.h:606 [inline]
kcalloc include/linux/slab.h:618 [inline]
ceph_parse_options+0xfe/0xe90 net/ceph/ceph_common.c:352
parse_mount_options fs/ceph/super.c:466 [inline]
ceph_mount+0x3c1/0x1709 fs/ceph/super.c:991
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 9986:
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+0xd4/0x110 net/ceph/ceph_common.c:288
ceph_destroy_client+0x9d/0xc0 net/ceph/ceph_common.c:671
create_fs_client fs/ceph/super.c:649 [inline]
ceph_mount+0xb46/0x1709 fs/ceph/super.c:998
mount_fs+0x9d/0x2a7 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+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff8881cdf40e00
which belongs to the cache kmalloc-8192 of size 8192
The buggy address is located 0 bytes inside of
8192-byte region [ffff8881cdf40e00, ffff8881cdf42e00)
The buggy address belongs to the page:
page:ffffea000737d000 count:1 mapcount:0 mapping:ffff8881cdf40e00 index:0x0
compound_mapcount: 0
flags: 0x6fffc0000008100(slab|head)
raw: 06fffc0000008100 ffff8881cdf40e00 0000000000000000 0000000100000001
raw: ffffea0007669120 ffffea00071f5220 ffff8880aa802080 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881cdf40d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881cdf40d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881cdf40e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881cdf40e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881cdf40f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
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