rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=2dc4/1/0x4000000000000000 softirq=59970/59971 fqs=0
rcu: 	(t=10500 jiffies g=47093 q=167 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g47093 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=16501
rcu: rcu_preempt kthread starved for 10500 jiffies! g47093 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26568 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10419 Comm: syz.7.1043 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70
Code: 89 fb e8 23 00 00 00 48 8b 3d 54 6f fe 0b 48 89 de 5b e9 f3 4f 59 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 e0 a0 92 65 8b 15 78 1a
RSP: 0018:ffffc90000007920 EFLAGS: 00000046
RAX: ffff888029342d28 RBX: 1ffff11009604f60 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007800
RBP: ffff88804b027b48 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f00 R12: ffff888029342d58
R13: ffff88804b027b00 R14: dffffc0000000000 R15: 0000000000000802
FS:  00007fafbb8ad6c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002b000 CR3: 000000002c04e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 hrtimer_try_to_cancel+0x2eb/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rep_movs_alternative+0x1e/0x90
Code: 90 90 90 90 90 90 90 90 90 90 90 90 48 83 f9 40 73 44 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 <e9> 8d 0a 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48
RSP: 0018:ffffc9000302f958 EFLAGS: 00010202
RAX: ffffffff84c75801 RBX: 0000000000000080 RCX: 0000000000000080
RDX: 0000000000000001 RSI: 000020000002b000 RDI: ffff88803540cf80
RBP: ffffc9000302fb10 R08: ffff88803540cfff R09: 1ffff11006a819ff
R10: dffffc0000000000 R11: ffffed1006a81a00 R12: ffff88803540cf80
R13: 00007ffffffff000 R14: 000020000002b000 R15: 0000000000000080
 copy_folio_from_iter_atomic+0x39e/0x1910
 generic_perform_write+0x5df/0x900
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fafba98ec29
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fafbb8ad038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fafbabd5fa0 RCX: 00007fafba98ec29
RDX: 000000011ffffce1 RSI: 0000200000000080 RDI: 0000000000000005
RBP: 00007fafbaa11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fafbabd6038 R14: 00007fafbabd5fa0 R15: 00007fffcdb40438
 </TASK>
CPU: 1 UID: 0 PID: 10418 Comm: syz.7.1043 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:smp_call_function_many_cond+0xd4b/0x12d0
Code: 00 00 00 00 fc ff df 75 07 e8 61 5f 0b 00 eb 38 f3 90 42 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 45 5f 0b 00 <eb> e4 44 89 e1 80 e1 07 80 c1 03 38 c1 7c e2 4c 89 e7 e8 6e 80 6f
RSP: 0000:ffffc900037f7720 EFLAGS: 00000293
RAX: ffffffff81b4665b RBX: 1ffff110096084c1 RCX: ffff88810c061cc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900037f78a0 R08: ffffffff8fa3b537 R09: 1ffffffff1f476a6
R10: dffffc0000000000 R11: fffffbfff1f476a7 R12: ffff88804b042608
R13: dffffc0000000000 R14: ffff88813663bdc0 R15: 0000000000000000
FS:  00005555746d3500(0000) GS:ffff8881a3c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002510 CR3: 000000002c04e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 ptep_clear_flush+0x120/0x170
 do_wp_page+0x1bc2/0x5800
 __handle_mm_fault+0x1033/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fafba958a13
Code: 0f 10 44 16 c0 48 29 ce 48 ff c7 48 01 fe 48 8d 54 11 c0 0f 1f 40 00 0f 10 0e 0f 10 56 10 0f 10 5e 20 0f 10 66 30 48 83 ee c0 <0f> 29 0f 0f 29 57 10 0f 29 5f 20 0f 29 67 30 48 83 ef c0 48 39 fa
RSP: 002b:00007fffcdb40598 EFLAGS: 00010203
RAX: 0000200000002500 RBX: 0000000000000004 RCX: 0000200000002500
RDX: 0000200000002ff3 RSI: 0000001b30520d2f RDI: 0000200000002510
RBP: 00007fffcdb40668 R08: 0000000000000000 R09: 000000000000002c
R10: 0000000000000000 R11: 0000000000000001 R12: 00007fafbabd609c
R13: 00007fafbabd6090 R14: fffffffffffffffe R15: 00007fffcdb406b0
 </TASK>
