rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=c25c/1/0x4000000000000000 softirq=41147/41147 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11001/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=36641, q=194 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11045 Comm: syz.4.1491 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:do_raw_spin_unlock+0x0/0x240
Code: 80 e1 07 80 c1 03 38 c1 0f 8c 6a ff ff ff e8 27 66 86 00 e9 60 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 55 41 57 41 56 41 55 41 54 53 48 89 fb 49 bc 00 00 00
RSP: 0018:ffffc90000007878 EFLAGS: 00000086
RAX: 168bb2d860acbb00 RBX: 0000000000000802 RCX: 168bb2d860acbb00
RDX: 0000000000000002 RSI: ffffffff8ddb21f6 RDI: ffff88804b027ac0
RBP: ffffc90000007918 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f00 R12: dffffc0000000000
R13: ffff88804b027b40 R14: ffff88804b027ac0 R15: 1ffff92000000f10
FS:  00007fe8d3d956c0(0000) GS:ffff8880b83e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000039e48000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000082
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_unlock_irqrestore+0x78/0x110
 hrtimer_try_to_cancel+0x3be/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3b8/0x500
 __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:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 cb 8f 26 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900046b7340 EFLAGS: 00000206
RAX: 168bb2d860acbb00 RBX: 0000000000000000 RCX: 168bb2d860acbb00
RDX: 0000000000000000 RSI: ffffffff8ddb21f6 RDI: ffffffff8c038200
RBP: ffffffff8210948c R08: 0000000000000000 R09: ffffffff8210948c
R10: ffffc900046b756c R11: fffff520008d6eb6 R12: 0000000000000002
R13: ffffffff8e33d660 R14: 0000000000000000 R15: 0000000000000246
 ___pte_offset_map+0x4c/0x340
 pte_offset_map_rw_nolock+0x3b/0x160
 __handle_mm_fault+0xb35/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0x764/0x1390
 exc_page_fault+0x82/0x100
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x75/0x90
Code: 05 e9 cf 2e 04 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 c3 cc cc cc cc 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc900046b7878 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffff8880464e0000 RCX: 0000000000001f9e
RDX: 0000000000000001 RSI: 0000200000002000 RDI: ffff8880464e0140
RBP: ffffc900046b79f0 R08: ffff8880464efe32 R09: 1ffff11008c9dfc6
R10: dffffc0000000000 R11: ffffed1008c9dfc7 R12: 1ffff920008d6f77
R13: 0000200000001ec0 R14: ffffc900046b7bc8 R15: 000000000000fe33
 _copy_from_iter+0x24f/0x1790
 netlink_sendmsg+0x6b2/0xb30
 __sock_sendmsg+0x21c/0x270
 sock_write_iter+0x279/0x360
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8d2f8eba9
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:00007fe8d3d95038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe8d31d5fa0 RCX: 00007fe8d2f8eba9
RDX: 000000000000fe33 RSI: 0000200000001ec0 RDI: 0000000000000005
RBP: 00007fe8d3011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe8d31d6038 R14: 00007fe8d31d5fa0 R15: 00007ffeee9150b8
 </TASK>
task:syz.4.1475      state:R  running task     stack:21224 pid:11001 tgid:11001 ppid:8304   task_flags:0x40064c flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_release+0x2b5/0x3e0
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 5b 7d 26 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000423ecb0 EFLAGS: 00000206
RAX: a854a17065ac1e00 RBX: 0000000000000206 RCX: a854a17065ac1e00
RDX: 0000000000000000 RSI: ffffffff8ddb21f6 RDI: ffffffff8c038200
RBP: ffff888028800b30 R08: ffffc9000423f900 R09: 0000000000000000
R10: ffffc9000423ee38 R11: fffff52000847dc9 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e33d660 R15: ffff888028800000
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 free_unref_folios+0xdb3/0x14f0
 folios_put_refs+0x584/0x670
 shmem_undo_range+0x49e/0x14b0
 shmem_evict_inode+0x272/0xa70
 evict+0x504/0x9c0
 __dentry_kill+0x209/0x660
 dput+0x19f/0x2b0
 __fput+0x68e/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0xa0/0x790
 irqentry_exit_to_user_mode+0x81/0x120
 exc_general_protection+0x171/0x200
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7fe8d2f8ebb1
RSP: 002b:0000200000000370 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fe8d31d6090 RCX: 00007fe8d2f8eba9
RDX: 0000200000000380 RSI: 0000200000000370 RDI: 0000000089001000
RBP: 00007fe8d3011e19 R08: 0000200000000500 R09: 0000200000000500
R10: 00002000000003c0 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fe8d31d6128 R14: 00007fe8d31d6090 R15: 00007ffeee9150b8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g36641 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=16273
rcu: rcu_preempt kthread starved for 10502 jiffies! g36641 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:27256 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+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
