FAT-fs (loop5): bogus number of reserved sectors
FAT-fs (loop5): Can't find a valid FAT filesystem
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10500 ticks this GP) idle=a56/1/0x4000000000000004 softirq=120794/120794 fqs=0 
rcu: 	 (t=10501 jiffies g=160981 q=35)
rcu: rcu_preempt kthread starved for 10502 jiffies! g160981 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29424    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2826 [inline]
 __schedule+0x866/0x1dc0 kernel/sched/core.c:3515
 schedule+0x92/0x1c0 kernel/sched/core.c:3559
 schedule_timeout+0x4db/0xfc0 kernel/time/timer.c:1806
 rcu_gp_kthread+0xd5c/0x2190 kernel/rcu/tree.c:2202
 kthread+0x354/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.220 msecs
NMI backtrace for cpu 0
CPU: 0 PID: 21255 Comm: syz-executor.5 Not tainted 4.19.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_lockdep_rcu_enabled+0x38/0xa0 kernel/rcu/update.c:253
Code: 00 fc ff df 48 89 c1 83 e0 07 48 89 e5 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 04 84 d2 75 49 8b 15 0c 2e 75 08 85 d2 74 3b <48> c7 c0 c0 57 3c 89 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0
RSP: 0018:ffff8880ae807698 EFLAGS: 00000002
RAX: 0000000000000003 RBX: 1ffff11015d00edb RCX: 1ffffffff139a952
RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffff888015a44abc
RBP: ffff8880ae807698 R08: 0000000000000000 R09: ffffed1015d04733
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: ffffffff88f934e0
R13: ffffffff8182281f R14: ffff888015a44240 R15: ffff8880ae807738
FS:  00007f80abfc1700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3062e000 CR3: 000000006d923000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0x625/0xa30 kernel/locking/lockdep.c:3921
 rcu_lock_release include/linux/rcupdate.h:247 [inline]
 rcu_read_unlock include/linux/rcupdate.h:681 [inline]
 __perf_event_output kernel/events/core.c:6584 [inline]
 perf_event_output_forward+0x1b6/0x290 kernel/events/core.c:6592
 __perf_event_overflow+0x141/0x370 kernel/events/core.c:7858
 perf_swevent_hrtimer+0x26d/0x3d0 kernel/events/core.c:9214
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:192
Code: c0 58 57 f2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 6d 5f 9d 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 22 d7 f3 f9 65 8b 05 cb f5 ac 78 85 c0 74 06 41
RSP: 0018:ffff8880ae807dd0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11e4aeb RBX: ffff888043691790 RCX: 1ffff11002b48966
RDX: dffffc0000000000 RSI: ffff888015a44b38 RDI: ffff888015a44abc
RBP: ffff8880ae807dd8 R08: ffff888015a44240 R09: ffff888015a44b30
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae823a00
R13: dffffc0000000000 R14: ffffffff85d88c40 R15: ffff8880ae823a00
 expire_timers kernel/time/timer.c:1362 [inline]
 __run_timers kernel/time/timer.c:1684 [inline]
 __run_timers kernel/time/timer.c:1652 [inline]
 run_timer_softirq+0x644/0x16a0 kernel/time/timer.c:1697
 __do_softirq+0x25c/0x921 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_acquire+0x1ea/0x3f0 kernel/locking/lockdep.c:3906
Code: 7c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 c4 01 00 00 48 83 3d 9a 12 a0 07 00 0f 84 38 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b
RSP: 0018:ffff88804574f318 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11e4ae9 RBX: ffff888015a44240 RCX: 000000003e06a49b
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff88804574f360 R08: 0000000000000000 R09: 0000000000000003
R10: ffff888015a44b38 R11: 00000000f5381a97 R12: ffffffff88f934e0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
 rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
 rcu_read_lock include/linux/rcupdate.h:627 [inline]
 lock_page_memcg+0x39/0x240 mm/memcontrol.c:1906
 mark_buffer_dirty+0x2b8/0x650 fs/buffer.c:1107
 __ext4_handle_dirty_metadata+0x37c/0x570 fs/ext4/ext4_jbd2.c:298
 ext4_mb_mark_diskspace_used+0x9b3/0x10d0 fs/ext4/mballoc.c:3024
 ext4_mb_new_blocks+0xaa4/0x3dd0 fs/ext4/mballoc.c:4555
 ext4_ext_map_blocks+0x2b26/0x55c0 fs/ext4/extents.c:4484
 ext4_map_blocks+0x990/0x1b20 fs/ext4/inode.c:649
 mpage_map_one_extent fs/ext4/inode.c:2469 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2522 [inline]
 ext4_writepages+0x1e5b/0x3450 fs/ext4/inode.c:2874
 do_writepages+0xf3/0x2a0 mm/page-writeback.c:2344
 __filemap_fdatawrite_range+0x28d/0x370 mm/filemap.c:446
 __filemap_fdatawrite mm/filemap.c:454 [inline]
 filemap_flush+0x24/0x30 mm/filemap.c:479
 ext4_alloc_da_blocks+0x225/0x380 fs/ext4/inode.c:3265
 ext4_release_file+0x1ff/0x350 fs/ext4/file.c:88
 __fput+0x2dd/0x8b0 fs/file_table.c:278
 ____fput+0x16/0x20 fs/file_table.c:309
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b399
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f80abfc0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007f80abfc16d4 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000072 R14: 0000000000501d92 R15: 000000000075c07c
NMI backtrace for cpu 1
CPU: 1 PID: 21254 Comm: syz-executor.5 Not tainted 4.19.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682
 update_process_times+0x32/0x80 kernel/time/timer.c:1638
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:168
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:192
Code: c0 58 57 f2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 6d 5f 9d 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 22 d7 f3 f9 65 8b 05 cb f5 ac 78 85 c0 74 06 41
RSP: 0018:ffff8880ae907dd0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11e4aeb RBX: ffff8880555e4ad8 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88800f9e2bfc
RBP: ffff8880ae907dd8 R08: ffff88800f9e2380 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae923a00
R13: dffffc0000000000 R14: ffffffff85d8c900 R15: ffff8880ae923a00
 expire_timers kernel/time/timer.c:1362 [inline]
 __run_timers kernel/time/timer.c:1684 [inline]
 __run_timers kernel/time/timer.c:1652 [inline]
 run_timer_softirq+0x644/0x16a0 kernel/time/timer.c:1697
 __do_softirq+0x25c/0x921 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:184
Code: 48 c7 c0 48 57 f2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d 6a 5a 9d 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 2c d2 f3 f9 65 8b 05 d5 f0 ac 78
RSP: 0018:ffff88800cf579c8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11e4ae9 RBX: 0000000000000286 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286
RBP: ffff88800cf579d8 R08: ffff88800f9e2380 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801415cb00
R13: ffff88801415c340 R14: 0000000000000001 R15: ffff8880ae92c258
 try_to_wake_up+0xcc/0xf50 kernel/sched/core.c:2056
 wake_up_process kernel/sched/core.c:2124 [inline]
 wake_up_q+0x99/0x100 kernel/sched/core.c:442
 futex_wake+0x429/0x4d0 kernel/futex.c:1619
 do_futex+0x358/0x1d70 kernel/futex.c:3697
 __do_sys_futex kernel/futex.c:3753 [inline]
 __se_sys_futex kernel/futex.c:3721 [inline]
 __x64_sys_futex+0x400/0x590 kernel/futex.c:3721
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b399
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f80abfe1cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000075bfd0 RCX: 000000000045b399
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000075bfd4
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 000000000075bfd4
R13: 00007ffeea59f1ef R14: 00007f80abfe29c0 R15: 000000000075bfd4
sched: RT throttling activated
FAT-fs (loop5): bogus number of reserved sectors