rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=294413, q=24)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295117220-4295106717), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g294413 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28864 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4683 [inline]
 __schedule+0x93a/0x26f0 kernel/sched/core.c:5940
 schedule+0xd3/0x270 kernel/sched/core.c:6019
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1878
 rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
 rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7996 Comm: syz-executor.2 Tainted: G        W         5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x3ba/0xb40 kernel/locking/qspinlock.c:508
Code: eb c6 45 01 01 41 bc 00 80 00 00 48 c1 e9 03 83 e3 07 41 be 01 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 2c 01 eb 0c f3 90 <41> 83 ec 01 0f 84 72 04 00 00 41 0f b6 45 00 38 d8 7f 08 84 c0 0f
RSP: 0018:ffffc90000dc0a30 EFLAGS: 00000206
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 1ffffffff18ef508
RDX: 0000000000000001 RSI: ffffffff817bab31 RDI: ffffffff81330591
RBP: ffffffff8c77a840 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff817baaf9 R11: 0000000000000080 R12: 00000000000075e5
R13: fffffbfff18ef508 R14: 0000000000000001 R15: ffff8880b9d52880
FS:  00007ff18f0ee700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcfdaddff8 CR3: 000000009931c000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
 spin_lock include/linux/spinlock.h:354 [inline]
 mac80211_hwsim_tx_frame_no_nl.isra.0+0x68f/0x1330 drivers/net/wireless/mac80211_hwsim.c:1516
 mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1784
 mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838
 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1601
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:schedule_debug kernel/sched/core.c:5256 [inline]
RIP: 0010:__schedule+0x134a/0x26f0 kernel/sched/core.c:5831
Code: 7b 08 4c 89 f9 4c 89 ea 8b b5 4c ff ff ff e8 ad 86 50 f8 65 ff 0d f6 e0 d6 76 0f 85 52 f1 ff ff e8 6a 36 d5 f7 e9 48 f1 ff ff <e8> 31 92 fe ff 85 c0 0f 84 68 ee ff ff 80 3d 0e 9c 2c 04 00 0f 85
RSP: 0018:ffffc9000235f740 EFLAGS: 00000286
RAX: 00000000ffffffff RBX: 0000000000000001 RCX: 0000000000000000
RDX: 1ffff9200046b000 RSI: 00000000ffffffff RDI: ffffffff8b97b840
RBP: ffffc9000235f808 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff817bab18 R11: 0000000000000001 R12: ffff8880b9d51a80
R13: ffff8880949154c0 R14: 0000000000051a80 R15: ffffc90002358000
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6328
 irqentry_exit+0x31/0x80 kernel/entry/common.c:427
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:71 [inline]
RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
RIP: 0010:lock_page_memcg+0x1bf/0x7d0 mm/memcontrol.c:2026
Code: 4a c1 81 58 e8 82 b9 99 ff 4d 85 ed 0f 85 a7 03 00 00 9c 58 f6 c4 02 0f 85 fc 03 00 00 4d 85 ed 74 01 fb 4c 8d ab 80 10 00 00 <be> 04 00 00 00 4c 89 ef e8 a4 5f fa ff 4c 89 e8 48 be 00 00 00 00
RSP: 0018:ffffc9000235f8e8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffff888140144000 RCX: 1ffffffff1ad8dc5
RDX: 0000000000000000 RSI: ffffffff817bab31 RDI: ffffffff81c14e43
RBP: ffffc9000235f930 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff817bab18 R11: 0000000000000000 R12: ffffea00023e48c8
R13: ffff888140145080 R14: fffff9400047c919 R15: ffffea00023e48c0
 mark_buffer_dirty+0x321/0x5e0 fs/buffer.c:1104
 __block_commit_write.constprop.0.isra.0+0x26a/0x3c0 fs/buffer.c:2079
 block_write_end fs/buffer.c:2158 [inline]
 generic_write_end+0xc9/0x500 fs/buffer.c:2172
 ext4_da_write_end+0x20f/0xb50 fs/ext4/inode.c:3110
 generic_perform_write+0x2bd/0x500 mm/filemap.c:3667
 ext4_buffered_write_iter+0x244/0x4d0 fs/ext4/file.c:269
 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x75a/0xa40 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff18f0ee188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000032614 RSI: 0000000020001580 RDI: 0000000000000007
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fffb8255abf R14: 00007ff18f0ee300 R15: 0000000000022000
softirq: huh, entered softirq 8 HRTIMER ffffffff81655470 with preempt_count 00000101, exited with 00000102?