overlayfs: unrecognized mount option "zê" or missing value

=============================
overlayfs: missing 'lowerdir'
BUG: sleeping function called from invalid context at mm/slab.h:419
in_atomic(): 1, irqs_disabled(): 0, pid: 11021, name: syz-executor6
1 lock held by syz-executor6/11021:
 #0:  (rcu_read_lock){....}, at: [<00000000b610eec8>] map_get_next_key kernel/bpf/syscall.c:836 [inline]
 #0:  (rcu_read_lock){....}, at: [<00000000b610eec8>] SYSC_bpf kernel/bpf/syscall.c:1881 [inline]
 #0:  (rcu_read_lock){....}, at: [<00000000b610eec8>] SyS_bpf+0x1105/0x4860 kernel/bpf/syscall.c:1846
CPU: 0 PID: 11021 Comm: syz-executor6 Not tainted 4.15.0-rc8+ #1
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+0x194/0x257 lib/dump_stack.c:53
 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6060
 __might_sleep+0x95/0x190 kernel/sched/core.c:6013
 slab_pre_alloc_hook mm/slab.h:419 [inline]
 slab_alloc mm/slab.c:3368 [inline]
 __do_kmalloc mm/slab.c:3706 [inline]
 __kmalloc+0x2c5/0x760 mm/slab.c:3717
 kmalloc include/linux/slab.h:504 [inline]
 trie_get_next_key+0x517/0xf10 kernel/bpf/lpm_trie.c:626
 map_get_next_key kernel/bpf/syscall.c:842 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1881 [inline]
 SyS_bpf+0x11b4/0x4860 kernel/bpf/syscall.c:1846
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007f55363fcc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452f19
RDX: 0000000000000018 RSI: 000000002001f000 RDI: 0000000000000004
RBP: 000000000000003c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef640
R13: 00000000ffffffff R14: 00007f55363fd6d4 R15: 0000000000000000
EXT4-fs (sda1): re-mounted. Opts: 
overlayfs: missing 'lowerdir'
EXT4-fs (sda1): re-mounted. Opts: 
overlayfs: missing 'lowerdir'
overlayfs: unrecognized mount option "êE`-YES8šQÝ
m8EXŠ
VÏ[ogƒ‹µ´PòøæUS›™NCóÉàŠÊû³cådÉwÐÿkÕ"ôðÎCˆÛDôV­5óGÜ×KE=•fšXNØKÀ±Kƒ¼Û{ “¨[#\" or missing value
overlayfs: unrecognized mount option "êE`-YES8šQÝ
m8EXŠ
VÏ[ogƒ‹µ´PòøæUS›™NCóÉàŠÊû³cådÉwÐÿkÕ"ôðÎCˆÛDôV­5óGÜ×KE=•fšXNØKÀ±Kƒ¼Û{ “¨[#\" or missing value
WARNING: suspicious RCU usage
4.15.0-rc8+ #1 Tainted: G        W       
-----------------------------
./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
autofs4:pid:11081:autofs4_fill_super: called with bogus options
autofs4:pid:11084:autofs4_fill_super: called with bogus options
1 lock held by syz-executor2/11022:
 #0:  (rcu_read_lock){....}, at: [<00000000b610eec8>] map_get_next_key kernel/bpf/syscall.c:836 [inline]
 #0:  (rcu_read_lock){....}, at: [<00000000b610eec8>] SYSC_bpf kernel/bpf/syscall.c:1881 [inline]
 #0:  (rcu_read_lock){....}, at: [<00000000b610eec8>] SyS_bpf+0x1105/0x4860 kernel/bpf/syscall.c:1846

stack backtrace:
CPU: 1 PID: 11022 Comm: syz-executor2 Tainted: G        W        4.15.0-rc8+ #1
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+0x194/0x257 lib/dump_stack.c:53
 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4585
 rcu_preempt_sleep_check include/linux/rcupdate.h:301 [inline]
 ___might_sleep+0x385/0x470 kernel/sched/core.c:6025
 __might_sleep+0x95/0x190 kernel/sched/core.c:6013
 slab_pre_alloc_hook mm/slab.h:419 [inline]
 slab_alloc mm/slab.c:3368 [inline]
 __do_kmalloc mm/slab.c:3706 [inline]
 __kmalloc+0x2c5/0x760 mm/slab.c:3717
 kmalloc include/linux/slab.h:504 [inline]
 trie_get_next_key+0x517/0xf10 kernel/bpf/lpm_trie.c:626
 map_get_next_key kernel/bpf/syscall.c:842 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1881 [inline]
 SyS_bpf+0x11b4/0x4860 kernel/bpf/syscall.c:1846
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007fbde07e3c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452f19
RDX: 0000000000000018 RSI: 000000002001f000 RDI: 0000000000000004
RBP: 00000000000003d6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4cb0
R13: 00000000ffffffff R14: 00007fbde07e46d4 R15: 0000000000000000
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
tmpfs: No value for mount option '|Ç÷‘6D:¯
y¯?2:u>úÔW,9'
tmpfs: No value for mount option '|Ç÷‘6D:¯
y¯?2:u>úÔW,9'
tmpfs: Bad mount option õ'0œ‚ª?CDyì(bDë¦(gå´º
tmpfs: Bad mount option õ'0œ‚ª?CDyì(bDë¦(gå´º
hrtimer: interrupt took 30059 ns
devpts: called with bogus options
devpts: called with bogus options
rpcbind: RPC call returned error 22
rpcbind: RPC call returned error 22
syz-executor7[12009] is installing a program with bpf_probe_write_user helper that may corrupt user memory!
syz-executor7[12009] is installing a program with bpf_probe_write_user helper that may corrupt user memory!
tmpfs: No value for mount option 'q6Ãëç$ÃÑ\TMojˆ~]>y<ŒÚ‚±ð.±Öë¶_Ô@œÈSä#-1TlW¨·ßøΘ+:Ã9®Ób»'
tmpfs: No value for mount option 'q6Ãëç$ÃÑ\TMojˆ~]>y<ŒÚ‚±ð.±Öë¶_Ô@œÈSä#-1TlW¨·ßøΘ+:Ã9®Ób»'
tmpfs: No value for mount option '|Ç÷‘6D:'
tmpfs: No value for mount option '|Ç÷‘6D:'
overlayfs: unrecognized mount option "zê" or missing value
overlayfs: unrecognized mount option "zê" or missing value