syzbot

FAT-fs (loop1): Unrecognized mount option "gid=" or missing value
INFO: rcu_sched detected stalls on CPUs/tasks:
	1-...: (3696 ticks this GP) idle=f4a/140000000000002/0 softirq=94267/94271 fqs=1998 
	(detected by 0, t=10503 jiffies, g=16881, c=16880, q=1164)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 20991 Comm: syz-executor.2 Not tainted 4.14.202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88809c42a540 task.stack: ffff888230270000
RIP: 0010:lock_release+0x3cc/0x870 kernel/locking/lockdep.c:4019
RSP: 0018:ffff8880ba507ab8 EFLAGS: 00000807
RAX: dffffc0000000000 RBX: 1ffff110174a0f5a RCX: 1ffff110138855d2
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff88809c42adc4
RBP: ffff88809c42a540 R08: ffffffff8b9c4700 R09: 0000000000000005
R10: 0000000000000000 R11: ffff88809c42a540 R12: 5c8c7f72812acd6b
R13: 0000000000000003 R14: ffff88809c42a540 R15: 0000000000000006
FS:  00007f411fcbf700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000052ff58 CR3: 0000000008e6a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 _raw_read_unlock+0x17/0x40 kernel/locking/spinlock.c:256
 kill_fasync_rcu fs/fcntl.c:997 [inline]
 kill_fasync fs/fcntl.c:1011 [inline]
 kill_fasync+0x1be/0x3c0 fs/fcntl.c:1004
 perf_event_wakeup kernel/events/core.c:5575 [inline]
 perf_pending_event+0x1d7/0x260 kernel/events/core.c:5599
 irq_work_run_list+0xf0/0x160 kernel/irq_work.c:156
 irq_work_run+0x4e/0xc0 kernel/irq_work.c:171
 smp_irq_work_interrupt+0xa3/0x4e0 arch/x86/kernel/irq_work.c:21
 irq_work_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:824
RIP: 0010:rb_next+0xd2/0x140 lib/rbtree.c:541
RSP: 0018:ffff8880ba507cf0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff09
RAX: ffff8880b3eae680 RBX: dffffc0000000000 RCX: 0000000000003f63
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880b3eae690
RBP: ffff88809cb48b80 R08: ffffffff8b9a75d8 R09: 00000000000425ee
R10: ffff88809c42ae18 R11: ffff88809c42a540 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff8880a57653f0 R15: 0000000000000001
 mrp_mad_event net/802/mrp.c:574 [inline]
 mrp_join_timer+0x44/0xc0 net/802/mrp.c:594
 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280
 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319
 __run_timers kernel/time/timer.c:1644 [inline]
 run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1657
 __do_softirq+0x254/0xa1d kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:60
RSP: 0018:ffff888230277760 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffff88809c42a540 RBX: 0000000000000000 RCX: ffff8882302779d0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0002300200
RBP: ffffea0002300200 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffff88809c42a540 R12: ffffea0002300200
R13: ffffea0002300200 R14: 00000000004de000 R15: 0000000000000000
 page_remove_file_rmap+0x1f/0x560 mm/rmap.c:1211
 page_remove_rmap+0x96/0xe0 mm/rmap.c:1296
 zap_pte_range mm/memory.c:1354 [inline]
 zap_pmd_range mm/memory.c:1456 [inline]
 zap_pud_range mm/memory.c:1485 [inline]
 zap_p4d_range mm/memory.c:1506 [inline]
 unmap_page_range+0xf3f/0x1ce0 mm/memory.c:1527
 unmap_single_vma+0x147/0x2b0 mm/memory.c:1572
 unmap_vmas+0x9d/0x160 mm/memory.c:1602
 exit_mmap+0x270/0x4d0 mm/mmap.c:3058
 __mmput kernel/fork.c:930 [inline]
 mmput kernel/fork.c:951 [inline]
 mmput+0xfa/0x420 kernel/fork.c:946
 exit_mm kernel/exit.c:545 [inline]
 do_exit+0x948/0x27f0 kernel/exit.c:852
 do_group_exit+0x100/0x2e0 kernel/exit.c:962
 get_signal+0x38d/0x1ca0 kernel/signal.c:2423
 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:814
 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45de49
RSP: 002b:00007f411fcbec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffea RBX: 0000000000001d40 RCX: 000000000045de49
RDX: 0000000000000048 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffcdf51785f R14: 00007f411fcbf9c0 R15: 000000000118bf2c
Code: 0f 84 6a 01 00 00 65 48 8b 2c 25 80 df 01 00 48 8d bd 84 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a7 03 00 00