KASAN: use-after-free Read in compute_effective_progs (2)
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syzbot
Apr 3, 2022, 4:00:24 AM4/3/22
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 414e6c8e941c ANDROID: fix up abi issue with struct snd_pcm..
git tree: android12-5.10-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=15b6fc80f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=c82cd64ef7210f0c
dashboard link: https://syzkaller.appspot.com/bug?extid=f264bffdfbd5614f3bb2
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=146783f7700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=107cc99b700000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f264bf...@syzkaller.appspotmail.com
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007fff40739c40 R14: 00007fff40739c80 R15: 0000000000000000
---[ end trace 04543ff737ed8a94 ]---
==================================================================
BUG: KASAN: use-after-free in prog_list_prog kernel/bpf/cgroup.c:174 [inline]
BUG: KASAN: use-after-free in prog_list_length kernel/bpf/cgroup.c:187 [inline]
BUG: KASAN: use-after-free in compute_effective_progs+0x1d3/0x6e0 kernel/bpf/cgroup.c:240
Read of size 8 at addr ffff888117e23c18 by task syz-executor260/367
CPU: 0 PID: 367 Comm: syz-executor260 Tainted: G W 5.10.109-syzkaller-00693-g414e6c8e941c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
print_address_description+0x8d/0x3d0 mm/kasan/report.c:233
__kasan_report+0x142/0x220 mm/kasan/report.c:419
kasan_report+0x51/0x70 mm/kasan/report.c:436
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
prog_list_prog kernel/bpf/cgroup.c:174 [inline]
prog_list_length kernel/bpf/cgroup.c:187 [inline]
compute_effective_progs+0x1d3/0x6e0 kernel/bpf/cgroup.c:240
update_effective_progs+0x79/0x310 kernel/bpf/cgroup.c:343
__cgroup_bpf_detach+0x312/0x570 kernel/bpf/cgroup.c:689
bpf_cgroup_link_release+0x94/0x260 kernel/bpf/cgroup.c:833
bpf_link_free kernel/bpf/syscall.c:2350 [inline]
bpf_link_put+0x1e9/0x270 kernel/bpf/syscall.c:2376
bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2384
__fput+0x348/0x7d0 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x147/0x1b0 kernel/task_work.c:154
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
exit_to_user_mode_prepare+0xc3/0xe0 kernel/entry/common.c:191
syscall_exit_to_user_mode+0x24/0x40 kernel/entry/common.c:266
do_syscall_64+0x3d/0x70 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f6c5fef0263
Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb ba 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
RSP: 002b:00007fff40739bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000009 RCX: 00007f6c5fef0263
RDX: 0000000000000c20 RSI: 0000000000000005 RDI: 0000000000000008
RBP: 00007fff40739c20 R08: 0000000000000001 R09: 00007fff40739c30
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007fff40739c40 R14: 00007fff40739c80 R15: 0000000000000000
Allocated by task 367:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:428 [inline]
____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:507
__kasan_kmalloc+0x9/0x10 mm/kasan/common.c:516
kasan_kmalloc include/linux/kasan.h:269 [inline]
kmem_cache_alloc_trace+0x210/0x3a0 mm/slub.c:2983
kmalloc include/linux/slab.h:552 [inline]
kzalloc include/linux/slab.h:664 [inline]
cgroup_bpf_link_attach+0x12e/0x4a0 kernel/bpf/cgroup.c:918
link_create kernel/bpf/syscall.c:4092 [inline]
__do_sys_bpf+0xab8e/0x116b0 kernel/bpf/syscall.c:4497
__se_sys_bpf kernel/bpf/syscall.c:4383 [inline]
__x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:4383
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 367:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
____kasan_slab_free+0x133/0x170 mm/kasan/common.c:360
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1604 [inline]
slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1630
slab_free mm/slub.c:3212 [inline]
kfree+0xd5/0x320 mm/slub.c:4200
bpf_cgroup_link_dealloc+0x15/0x20 kernel/bpf/cgroup.c:849
bpf_link_free kernel/bpf/syscall.c:2354 [inline]
bpf_link_put+0x243/0x270 kernel/bpf/syscall.c:2376
bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2384
__fput+0x348/0x7d0 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x147/0x1b0 kernel/task_work.c:154
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
exit_to_user_mode_prepare+0xc3/0xe0 kernel/entry/common.c:191
syscall_exit_to_user_mode+0x24/0x40 kernel/entry/common.c:266
do_syscall_64+0x3d/0x70 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff888117e23c00
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 24 bytes inside of
96-byte region [ffff888117e23c00, ffff888117e23c60)
The buggy address belongs to the page:
page:ffffea00045f88c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117e23
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff888100043680
raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 367, ts 34827930642, free_ts 34827874093
set_page_owner include/linux/page_owner.h:35 [inline]
post_alloc_hook mm/page_alloc.c:2385 [inline]
prep_new_page mm/page_alloc.c:2391 [inline]
get_page_from_freelist+0xa74/0xa90 mm/page_alloc.c:4063
__alloc_pages_nodemask+0x3c8/0x820 mm/page_alloc.c:5113
alloc_slab_page mm/slub.c:1815 [inline]
allocate_slab+0x6b/0x350 mm/slub.c:1817
new_slab mm/slub.c:1878 [inline]
new_slab_objects mm/slub.c:2637 [inline]
___slab_alloc+0x143/0x2f0 mm/slub.c:2800
__slab_alloc mm/slub.c:2840 [inline]
slab_alloc_node mm/slub.c:2922 [inline]
slab_alloc mm/slub.c:2964 [inline]
kmem_cache_alloc_trace+0x278/0x3a0 mm/slub.c:2981
kmem_cache_alloc_node_trace include/linux/slab.h:440 [inline]
kmalloc_node include/linux/slab.h:570 [inline]
kzalloc_node include/linux/slab.h:675 [inline]
__get_vm_area_node+0x134/0x200 mm/vmalloc.c:2077
__vmalloc_node_range+0xd8/0x750 mm/vmalloc.c:2560
module_alloc+0x81/0x90 arch/x86/kernel/module.c:75
bpf_jit_alloc_exec+0x15/0x20 kernel/bpf/core.c:854
bpf_jit_binary_alloc+0x12e/0x260 kernel/bpf/core.c:882
bpf_int_jit_compile+0x8f37/0x9fd0 arch/x86/net/bpf_jit_comp.c:2137
bpf_prog_select_runtime+0x745/0xa10 kernel/bpf/core.c:1871
bpf_prog_load kernel/bpf/syscall.c:2237 [inline]
__do_sys_bpf+0x10451/0x116b0 kernel/bpf/syscall.c:4427
__se_sys_bpf kernel/bpf/syscall.c:4383 [inline]
__x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:4383
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1331 [inline]
free_pcp_prepare+0x18f/0x1c0 mm/page_alloc.c:1405
free_unref_page_prepare mm/page_alloc.c:3291 [inline]
free_unref_page mm/page_alloc.c:3341 [inline]
free_the_page mm/page_alloc.c:5172 [inline]
__free_pages+0x2e3/0x4a0 mm/page_alloc.c:5180
__vunmap+0x856/0x980 mm/vmalloc.c:2275
__vfree mm/vmalloc.c:2323 [inline]
vfree+0x62/0xf0 mm/vmalloc.c:2354
bpf_check+0xdf4b/0x139a0 kernel/bpf/verifier.c:12528
bpf_prog_load kernel/bpf/syscall.c:2233 [inline]
__do_sys_bpf+0x103e6/0x116b0 kernel/bpf/syscall.c:4427
__se_sys_bpf kernel/bpf/syscall.c:4383 [inline]
__x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:4383
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Memory state around the buggy address:
ffff888117e23b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888117e23b80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff888117e23c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888117e23c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888117e23d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following issue on:
HEAD commit: 414e6c8e941c ANDROID: fix up abi issue with struct snd_pcm..
git tree: android12-5.10-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=15b6fc80f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=c82cd64ef7210f0c
dashboard link: https://syzkaller.appspot.com/bug?extid=f264bffdfbd5614f3bb2
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=146783f7700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=107cc99b700000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f264bf...@syzkaller.appspotmail.com
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007fff40739c40 R14: 00007fff40739c80 R15: 0000000000000000
---[ end trace 04543ff737ed8a94 ]---
==================================================================
BUG: KASAN: use-after-free in prog_list_prog kernel/bpf/cgroup.c:174 [inline]
BUG: KASAN: use-after-free in prog_list_length kernel/bpf/cgroup.c:187 [inline]
BUG: KASAN: use-after-free in compute_effective_progs+0x1d3/0x6e0 kernel/bpf/cgroup.c:240
Read of size 8 at addr ffff888117e23c18 by task syz-executor260/367
CPU: 0 PID: 367 Comm: syz-executor260 Tainted: G W 5.10.109-syzkaller-00693-g414e6c8e941c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
print_address_description+0x8d/0x3d0 mm/kasan/report.c:233
__kasan_report+0x142/0x220 mm/kasan/report.c:419
kasan_report+0x51/0x70 mm/kasan/report.c:436
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
prog_list_prog kernel/bpf/cgroup.c:174 [inline]
prog_list_length kernel/bpf/cgroup.c:187 [inline]
compute_effective_progs+0x1d3/0x6e0 kernel/bpf/cgroup.c:240
update_effective_progs+0x79/0x310 kernel/bpf/cgroup.c:343
__cgroup_bpf_detach+0x312/0x570 kernel/bpf/cgroup.c:689
bpf_cgroup_link_release+0x94/0x260 kernel/bpf/cgroup.c:833
bpf_link_free kernel/bpf/syscall.c:2350 [inline]
bpf_link_put+0x1e9/0x270 kernel/bpf/syscall.c:2376
bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2384
__fput+0x348/0x7d0 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x147/0x1b0 kernel/task_work.c:154
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
exit_to_user_mode_prepare+0xc3/0xe0 kernel/entry/common.c:191
syscall_exit_to_user_mode+0x24/0x40 kernel/entry/common.c:266
do_syscall_64+0x3d/0x70 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f6c5fef0263
Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb ba 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
RSP: 002b:00007fff40739bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000009 RCX: 00007f6c5fef0263
RDX: 0000000000000c20 RSI: 0000000000000005 RDI: 0000000000000008
RBP: 00007fff40739c20 R08: 0000000000000001 R09: 00007fff40739c30
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007fff40739c40 R14: 00007fff40739c80 R15: 0000000000000000
Allocated by task 367:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:428 [inline]
____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:507
__kasan_kmalloc+0x9/0x10 mm/kasan/common.c:516
kasan_kmalloc include/linux/kasan.h:269 [inline]
kmem_cache_alloc_trace+0x210/0x3a0 mm/slub.c:2983
kmalloc include/linux/slab.h:552 [inline]
kzalloc include/linux/slab.h:664 [inline]
cgroup_bpf_link_attach+0x12e/0x4a0 kernel/bpf/cgroup.c:918
link_create kernel/bpf/syscall.c:4092 [inline]
__do_sys_bpf+0xab8e/0x116b0 kernel/bpf/syscall.c:4497
__se_sys_bpf kernel/bpf/syscall.c:4383 [inline]
__x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:4383
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 367:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357
____kasan_slab_free+0x133/0x170 mm/kasan/common.c:360
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1604 [inline]
slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1630
slab_free mm/slub.c:3212 [inline]
kfree+0xd5/0x320 mm/slub.c:4200
bpf_cgroup_link_dealloc+0x15/0x20 kernel/bpf/cgroup.c:849
bpf_link_free kernel/bpf/syscall.c:2354 [inline]
bpf_link_put+0x243/0x270 kernel/bpf/syscall.c:2376
bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2384
__fput+0x348/0x7d0 fs/file_table.c:281
____fput+0x15/0x20 fs/file_table.c:314
task_work_run+0x147/0x1b0 kernel/task_work.c:154
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
exit_to_user_mode_prepare+0xc3/0xe0 kernel/entry/common.c:191
syscall_exit_to_user_mode+0x24/0x40 kernel/entry/common.c:266
do_syscall_64+0x3d/0x70 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff888117e23c00
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 24 bytes inside of
96-byte region [ffff888117e23c00, ffff888117e23c60)
The buggy address belongs to the page:
page:ffffea00045f88c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117e23
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff888100043680
raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 367, ts 34827930642, free_ts 34827874093
set_page_owner include/linux/page_owner.h:35 [inline]
post_alloc_hook mm/page_alloc.c:2385 [inline]
prep_new_page mm/page_alloc.c:2391 [inline]
get_page_from_freelist+0xa74/0xa90 mm/page_alloc.c:4063
__alloc_pages_nodemask+0x3c8/0x820 mm/page_alloc.c:5113
alloc_slab_page mm/slub.c:1815 [inline]
allocate_slab+0x6b/0x350 mm/slub.c:1817
new_slab mm/slub.c:1878 [inline]
new_slab_objects mm/slub.c:2637 [inline]
___slab_alloc+0x143/0x2f0 mm/slub.c:2800
__slab_alloc mm/slub.c:2840 [inline]
slab_alloc_node mm/slub.c:2922 [inline]
slab_alloc mm/slub.c:2964 [inline]
kmem_cache_alloc_trace+0x278/0x3a0 mm/slub.c:2981
kmem_cache_alloc_node_trace include/linux/slab.h:440 [inline]
kmalloc_node include/linux/slab.h:570 [inline]
kzalloc_node include/linux/slab.h:675 [inline]
__get_vm_area_node+0x134/0x200 mm/vmalloc.c:2077
__vmalloc_node_range+0xd8/0x750 mm/vmalloc.c:2560
module_alloc+0x81/0x90 arch/x86/kernel/module.c:75
bpf_jit_alloc_exec+0x15/0x20 kernel/bpf/core.c:854
bpf_jit_binary_alloc+0x12e/0x260 kernel/bpf/core.c:882
bpf_int_jit_compile+0x8f37/0x9fd0 arch/x86/net/bpf_jit_comp.c:2137
bpf_prog_select_runtime+0x745/0xa10 kernel/bpf/core.c:1871
bpf_prog_load kernel/bpf/syscall.c:2237 [inline]
__do_sys_bpf+0x10451/0x116b0 kernel/bpf/syscall.c:4427
__se_sys_bpf kernel/bpf/syscall.c:4383 [inline]
__x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:4383
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1331 [inline]
free_pcp_prepare+0x18f/0x1c0 mm/page_alloc.c:1405
free_unref_page_prepare mm/page_alloc.c:3291 [inline]
free_unref_page mm/page_alloc.c:3341 [inline]
free_the_page mm/page_alloc.c:5172 [inline]
__free_pages+0x2e3/0x4a0 mm/page_alloc.c:5180
__vunmap+0x856/0x980 mm/vmalloc.c:2275
__vfree mm/vmalloc.c:2323 [inline]
vfree+0x62/0xf0 mm/vmalloc.c:2354
bpf_check+0xdf4b/0x139a0 kernel/bpf/verifier.c:12528
bpf_prog_load kernel/bpf/syscall.c:2233 [inline]
__do_sys_bpf+0x103e6/0x116b0 kernel/bpf/syscall.c:4427
__se_sys_bpf kernel/bpf/syscall.c:4383 [inline]
__x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:4383
do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Memory state around the buggy address:
ffff888117e23b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888117e23b80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff888117e23c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888117e23c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888117e23d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report 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.
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