rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10475 ticks this GP) idle=d5a/1/0x4000000000000000 softirq=245609/245614 fqs=0 
	(t=10501 jiffies g=423197 q=36)
rcu: rcu_preempt kthread starved for 10502 jiffies! g423197 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:1879
 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 22715 Comm: syz-executor.3 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:asm_sysvec_apic_timer_interrupt+0x0/0x20 arch/x86/include/asm/idtentry.h:637
Code: 00 66 0f 1f 84 00 00 00 00 00 0f 1f 00 6a ff e8 76 03 00 00 48 89 e7 e8 9e 45 ea ff e9 29 04 00 00 66 0f 1f 84 00 00 00 00 00 <0f> 1f 00 6a ff e8 56 03 00 00 48 89 e7 e8 ee 43 ea ff e9 09 04 00
RSP: 0018:ffffc9000180f258 EFLAGS: 00000006
RAX: 0000000000000003 RBX: 0000000000000000 RCX: 1ffff11004202ca6
RDX: 0000000000000001 RSI: ffffffff817bcf01 RDI: ffffffff81332591
RBP: ffff888021016530 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817bcec9 R11: 0000000000000000 R12: 0000000000005e8b
R13: ffffed1004202ca6 R14: 0000000000000001 R15: ffff8880b9c52880
FS:  00007fbea2602700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ae09ca718 CR3: 0000000020930000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
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
 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]
 dd_bio_merge+0xbd/0x150 block/mq-deadline-main.c:698
 __blk_mq_sched_bio_merge+0xa1/0x450 block/blk-mq-sched.c:376
 blk_mq_sched_bio_merge block/blk-mq-sched.h:40 [inline]
 blk_mq_submit_bio+0x30c/0x1860 block/blk-mq.c:2199
 __submit_bio_noacct_mq block/blk-core.c:1011 [inline]
 submit_bio_noacct block/blk-core.c:1044 [inline]
 submit_bio_noacct+0xad2/0xf20 block/blk-core.c:1027
 submit_bio+0x1ea/0x470 block/blk-core.c:1106
 submit_bh_wbc+0x5eb/0x7f0 fs/buffer.c:3050
 submit_bh fs/buffer.c:3056 [inline]
 __sync_dirty_buffer+0x16d/0x3f0 fs/buffer.c:3151
 __ext4_handle_dirty_metadata+0x28f/0x720 fs/ext4/ext4_jbd2.c:364
 ext4_free_data+0x281/0x3a0 fs/ext4/indirect.c:966
 ext4_free_branches+0x514/0x660 fs/ext4/indirect.c:1095
 ext4_ind_truncate+0x409/0x950 fs/ext4/indirect.c:1168
 ext4_truncate+0x696/0x1440 fs/ext4/inode.c:4264
 ext4_truncate_failed_write fs/ext4/truncate.h:20 [inline]
 ext4_handle_inode_extension+0x4f7/0x8c0 fs/ext4/file.c:358
 ext4_dio_write_iter fs/ext4/file.c:574 [inline]
 ext4_file_write_iter+0x11e2/0x14e0 fs/ext4/file.c:678
 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:00007fbea2602188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000043408 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffeba94efbf R14: 00007fbea2602300 R15: 0000000000022000
NMI backtrace for cpu 1
CPU: 1 PID: 22710 Comm: syz-executor.5 Not tainted 5.14.0-rc4-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:342
 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641
 update_process_times+0x16d/0x200 kernel/time/timer.c:1783
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:mac80211_hwsim_tx_frame_no_nl.isra.0+0x78f/0x1330 drivers/net/wireless/mac80211_hwsim.c:1527
Code: bb ac 3c 00 00 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 0f b6 04 28 38 d0 7f 08 84 c0 0f 85 36 09 00 00 44 0f b6 bb ac 3c 00 00 <31> ff 44 89 fe e8 07 4d 43 fc 45 84 ff 0f 84 77 ff ff ff e8 b9 46
RSP: 0018:ffffc90000dc0ba0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888083da3260 RCX: 0000000000000100
RDX: 0000000000000004 RSI: ffffffff853264d3 RDI: ffff888083da6f0c
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: ffffffff85326509 R11: 0000000000000000 R12: ffff888099295640
R13: ffff888066683490 R14: ffff888066683260 R15: 0000000000000000
 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:debug_spin_unlock kernel/locking/spinlock_debug.c:97 [inline]
RIP: 0010:do_raw_spin_unlock+0x0/0x230 kernel/locking/spinlock_debug.c:138
Code: cc 48 89 df e8 c1 41 60 00 e9 1f ff ff ff e8 27 42 60 00 eb 86 e8 40 bc ce 07 e8 3b 42 60 00 eb a2 66 0f 1f 84 00 00 00 00 00 <48> b8 00 00 00 00 00 fc ff df 41 55 41 54 55 48 89 fd 48 83 c7 04
RSP: 0018:ffffc90001a6eba8 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff888021399048 RCX: ffffc90001a6eb38
RDX: 1ffff1100414013c RSI: 0000000000000001 RDI: ffff888021016530
RBP: ffff888021016530 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888021016488
R13: ffff888021016460 R14: 0000000000000001 R15: dffffc0000000000
 __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock+0x1a/0x40 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:394 [inline]
 dd_insert_requests+0xc74/0x10a0 block/mq-deadline-main.c:789
 blk_mq_sched_insert_requests+0x1c5/0x680 block/blk-mq-sched.c:498
 blk_mq_flush_plug_list+0x3d8/0x560 block/blk-mq.c:1955
 blk_flush_plug_list+0x4d/0x60 block/blk-core.c:1731
 blk_mq_submit_bio+0xbc8/0x1860 block/blk-mq.c:2256
 __submit_bio_noacct_mq block/blk-core.c:1011 [inline]
 submit_bio_noacct block/blk-core.c:1044 [inline]
 submit_bio_noacct+0xad2/0xf20 block/blk-core.c:1027
 submit_bio+0x1ea/0x470 block/blk-core.c:1106
 submit_bh_wbc+0x5eb/0x7f0 fs/buffer.c:3050
 submit_bh fs/buffer.c:3056 [inline]
 __sync_dirty_buffer+0x16d/0x3f0 fs/buffer.c:3151
 __ext4_handle_dirty_metadata+0x28f/0x720 fs/ext4/ext4_jbd2.c:364
 ext4_splice_branch fs/ext4/indirect.c:463 [inline]
 ext4_ind_map_blocks+0x11dc/0x2440 fs/ext4/indirect.c:637
 ext4_map_blocks+0x9c9/0x17d0 fs/ext4/inode.c:640
 mpage_map_one_extent fs/ext4/inode.c:2395 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2448 [inline]
 ext4_writepages+0x1d01/0x3ba0 fs/ext4/inode.c:2800
 do_writepages+0xec/0x290 mm/page-writeback.c:2355
 __filemap_fdatawrite_range+0x2a5/0x390 mm/filemap.c:413
 file_write_and_wait_range+0xb2/0x120 mm/filemap.c:792
 ext4_sync_file+0x21f/0xfd0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x13a/0x220 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2987 [inline]
 ext4_buffered_write_iter+0x36a/0x4d0 fs/ext4/file.c:277
 ext4_dio_write_iter fs/ext4/file.c:587 [inline]
 ext4_file_write_iter+0xf00/0x14e0 fs/ext4/file.c:678
 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:00007f39966ee188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000043408 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffcf154c6bf R14: 00007f39966ee300 R15: 0000000000022000