audit: type=1326 audit(1593301596.351:21): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8138 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45f95a code=0x0
INFO: rcu_sched detected stalls on CPUs/tasks:
	1-...: (1 GPs behind) idle=dbe/140000000000001/0 softirq=12389/12405 fqs=19 
	(detected by 0, t=10504 jiffies, g=754, c=753, q=3)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8142 Comm: syz-executor.4 Not tainted 4.14.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888062e20580 task.stack: ffff888062ef0000
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:142 [inline]
RIP: 0010:native_write_msr+0x6/0x20 arch/x86/include/asm/msr.h:150
RSP: 0018:ffff8880aed07ea0 EFLAGS: 00000046
RAX: 00000000000000d2 RBX: 0000000000000838 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000000d2 RDI: 0000000000000838
RBP: ffff8880aed1f140 R08: ffff88821fff705c R09: ffff88821fff7048
R10: ffff88821fff7050 R11: 00000034cfeebf5c R12: 00000000000000d2
R13: 0000000000000003 R14: 00000033a53734fe R15: 69e374bf0732eed9
FS:  00007fb049b05700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30537000 CR3: 000000009ffb6000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 paravirt_write_msr arch/x86/include/asm/paravirt.h:117 [inline]
 native_apic_msr_write+0x53/0x80 arch/x86/include/asm/apic.h:193
 apic_write arch/x86/include/asm/apic.h:395 [inline]
 lapic_next_event+0x53/0x80 arch/x86/kernel/apic/apic.c:467
 clockevents_program_event+0x1f1/0x2d0 kernel/time/clockevents.c:339
 tick_program_event+0x78/0xd0 kernel/time/tick-oneshot.c:47
 hrtimer_interrupt+0x336/0x5e0 kernel/time/hrtimer.c:1334
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
 smp_apic_timer_interrupt+0x117/0x5f0 arch/x86/kernel/apic/apic.c:1100
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:ext4_da_write_end+0x4cb/0x950 fs/ext4/inode.c:3211
RSP: 0018:ffff888062ef7630 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000038 RBX: 00000000000008f0 RCX: ffffc9000ceca000
RDX: 0000000000040000 RSI: ffffffff81bfd893 RDI: ffff888062e21588
RBP: ffff88805db47570 R08: ffff88805d849540 R09: 0000000000000002
R10: ffff888062e20e58 R11: 0000000000000000 R12: 0000000000000038
R13: 00000000016eb8f0 R14: 0000000000000038 R15: 0000000000000038
 generic_perform_write+0x268/0x420 mm/filemap.c:3058
 __generic_file_write_iter+0x227/0x590 mm/filemap.c:3172
 ext4_file_write_iter+0x279/0xd90 fs/ext4/file.c:270
 call_write_iter include/linux/fs.h:1778 [inline]
 do_iter_readv_writev+0x3df/0x600 fs/read_write.c:675
 do_iter_write fs/read_write.c:954 [inline]
 do_iter_write+0x152/0x550 fs/read_write.c:935
 vfs_iter_write+0x70/0xa0 fs/read_write.c:967
 iter_file_splice_write+0x52e/0xa10 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x115/0x160 fs/splice.c:1018
 splice_direct_to_actor+0x27e/0x730 fs/splice.c:973
 do_splice_direct+0x164/0x210 fs/splice.c:1061
 do_sendfile+0x469/0xaf0 fs/read_write.c:1441
 SYSC_sendfile64 fs/read_write.c:1496 [inline]
 SyS_sendfile64+0x9b/0x110 fs/read_write.c:1488
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45cb19
RSP: 002b:00007fb049b04c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004fd640 RCX: 000000000045cb19
RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 000000000078c180 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000901 R14: 00000000004cbddf R15: 00007fb049b056d4
Code: ec 08 48 09 d0 8b 16 48 89 c6 48 89 04 24 e8 62 7a e7 01 48 8b 04 24 48 83 c4 08 c3 66 0f 1f 84 00 00 00 00 00 89 f9 89 f0 0f 30 <0f> 1f 44 00 00 c3 48 c1 e2 20 89 f6 48 09 d6 31 d2 e9 e4 77 e7 
rcu_sched kthread starved for 10464 jiffies! g754 c753 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
INFO: rcu_preempt self-detected stall on CPU
rcu_sched       R
	1-...: (1 GPs behind) idle=dbe/140000000000001/0 softirq=12395/12405 fqs=15 
  running task    
	
29904     9      2 0x80000000
 (t=10500 jiffies g=1888 c=1887 q=388)
Call Trace:
rcu_preempt kthread starved for 10470 jiffies! g1888 c1887 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384
rcu_preempt     R
  running task    
29904     8      2 0x80000000
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384
 schedule_timeout+0x4df/0xe50 kernel/time/timer.c:1746
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_timeout+0x4df/0xe50 kernel/time/timer.c:1746
 rcu_gp_kthread+0xb3d/0x1ce0 kernel/rcu/tree.c:2255
 kthread+0x30d/0x420 kernel/kthread.c:232
 rcu_gp_kthread+0xb3d/0x1ce0 kernel/rcu/tree.c:2255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
NMI backtrace for cpu 1
CPU: 1 PID: 8142 Comm: syz-executor.4 Not tainted 4.14.184-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:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline]
 rcu_dump_cpu_stacks+0x16d/0x1b8 kernel/rcu/tree.c:1396
 print_cpu_stall kernel/rcu/tree.c:1542 [inline]
 check_cpu_stall kernel/rcu/tree.c:1610 [inline]
 __rcu_pending kernel/rcu/tree.c:3390 [inline]
 rcu_pending kernel/rcu/tree.c:3452 [inline]
 rcu_check_callbacks.cold+0x490/0xdaa kernel/rcu/tree.c:2792
 update_process_times+0x29/0x60 kernel/time/timer.c:1590
 tick_sched_handle.isra.0+0x73/0x150 kernel/time/tick-sched.c:165
 tick_sched_timer+0x41/0x120 kernel/time/tick-sched.c:1223
 __run_hrtimer kernel/time/hrtimer.c:1223 [inline]
 __hrtimer_run_queues+0x24b/0xb90 kernel/time/hrtimer.c:1287
 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
 smp_apic_timer_interrupt+0x117/0x5f0 arch/x86/kernel/apic/apic.c:1100
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:lock_release+0x41e/0x7f0 kernel/locking/lockdep.c:4020
RSP: 0018:ffff888062ef7870 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0f62cd1 RBX: 1ffff1100c5def12 RCX: 1ffff1100c5c41bf
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000282
RBP: ffff888062e20580 R08: 0000000000000001 R09: 0000000000000001
R10: ffff888062e20e30 R11: ffff888062e20580 R12: ffffffff816d515b
R13: 0000000000000003 R14: ffff888062e20580 R15: 0000000000000002
 rcu_lock_release include/linux/rcupdate.h:247 [inline]
 rcu_read_unlock include/linux/rcupdate.h:685 [inline]
 find_get_entry+0x342/0x660 mm/filemap.c:1392
 pagecache_get_page+0x44/0xa10 mm/filemap.c:1465
 find_get_page include/linux/pagemap.h:276 [inline]
 generic_file_buffered_read mm/filemap.c:1999 [inline]
 generic_file_read_iter+0x564/0x21d0 mm/filemap.c:2273
 ext4_file_read_iter+0x14b/0x330 fs/ext4/file.c:76
 call_read_iter include/linux/fs.h:1772 [inline]
 generic_file_splice_read+0x374/0x5d0 fs/splice.c:307
 do_splice_to+0xfb/0x150 fs/splice.c:880
 splice_direct_to_actor+0x20a/0x730 fs/splice.c:952
 do_splice_direct+0x164/0x210 fs/splice.c:1061
 do_sendfile+0x469/0xaf0 fs/read_write.c:1441
 SYSC_sendfile64 fs/read_write.c:1496 [inline]
 SyS_sendfile64+0x9b/0x110 fs/read_write.c:1488
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45cb19
RSP: 002b:00007fb049b04c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004fd640 RCX: 000000000045cb19
RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 000000000078c180 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000901 R14: 00000000004cbddf R15: 00007fb049b056d4