rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=003c/1/0x4000000000000000 softirq=46732/46743 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12731/1:b..l
rcu: 	(detected by 0, t=10505 jiffies, g=41953, q=291 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12810 Comm: syz.0.2038 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:hrtimer_cancel+0x36/0x50
Code: 12 00 48 89 df e8 9a f9 ff ff 89 c5 31 ff 89 c6 e8 cf 19 12 00 85 ed 78 0c e8 86 15 12 00 eb 1a e8 7f 15 12 00 f3 90 48 89 df <e8> 75 f9 ff ff 85 c0 78 ed 89 c5 e8 6a 15 12 00 89 e8 5b 5d c3 cc
RSP: 0018:ffffc900001e0990 EFLAGS: 00000006
RAX: ffffffff81adb021 RBX: ffff888113c73368 RCX: ffff88810f9f8000
RDX: 0000000000010000 RSI: 0000000000000004 RDI: ffff888113c73368
RBP: 00000000ffffffff R08: ffff888136627a83 R09: 1ffff11026cc4f50
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: ffff888113c73410
R13: dffffc0000000000 R14: ffff888113c73368 R15: ffffffffffff02dd
FS:  00007fcb68c636c0(0000) GS:ffff8881a3c11000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3228ed CR3: 00000001132c4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:strlen+0x3f/0x70
Code: 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 <75> de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc 48 89 df e8 59 ee
RSP: 0018:ffffc9000428fa18 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffffffff8b8bd562 RCX: 0000000000080000
RDX: ffffffff81b2eb1b RSI: ffffffff8e13a160 RDI: ffffffff8b8bd560
RBP: ffffc9000428fb30 R08: 0000000000000000 R09: ffffffff81b2eb1b
R10: dffffc0000000000 R11: ffffed1020c02736 R12: 1ffff92000851f50
R13: ffffffff81b2eb1b R14: dffffc0000000000 R15: 0000000000000000
 perf_trace_lock+0xc2/0x3b0
 lock_release+0x3b2/0x3e0
 futex_private_hash_put+0x206/0x280
 futex_wake+0x4b2/0x560
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb67d8ec29
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:00007fcb68c630e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fcb67fd5fa8 RCX: 00007fcb67d8ec29
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fcb67fd5fac
RBP: 00007fcb67fd5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb67fd6038 R14: 00007ffc37a83710 R15: 00007ffc37a837f8
 </TASK>
task:syz.5.2012      state:R  running task     stack:21816 pid:12731 tgid:12731 ppid:10478  task_flags:0x40064c flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_notrace+0xd1/0x110
 preempt_schedule_notrace_thunk+0x16/0x30
 lock_release+0x3ca/0x3e0
 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+0xdbd/0x1520
 folios_put_refs+0x559/0x640
 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+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 exc_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0xd747e0
RSP: 002b:0000200000000438 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f836c1d5fa0 RCX: 00007f836bf8ec29
RDX: 0000200000000440 RSI: 0000200000000430 RDI: 0000000000808000
RBP: 00007f836c011e41 R08: 00002000000004c0 R09: 00002000000004c0
R10: 0000200000000480 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f836c1d6038 R14: 00007f836c1d5fa0 R15: 00007ffe45eb28b8
 </TASK>
rcu: rcu_preempt kthread starved for 10505 jiffies! g41953 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:26728 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>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 12808 Comm: syz.4.2039 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+0xd3c/0x12d0
Code: 01 31 ff e8 b6 63 0b 00 41 83 e5 01 49 bd 00 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
RSP: 0018:ffffc90006ab76c0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff11026cc7f61 RCX: ffff888111e28000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90006ab7840 R08: ffff888020a7d547 R09: 1ffff1100414faa8
R10: dffffc0000000000 R11: ffffed100414faa9 R12: ffff88813663fb08
R13: dffffc0000000000 R14: ffff88804b03b1c0 R15: 0000000000000001
FS:  0000555582f8e500(0000) GS:ffff8880b8611000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000001 CR3: 0000000041f8a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 tlb_flush_mmu+0x1a7/0x680
 tlb_finish_mmu+0xc3/0x1d0
 exit_mmap+0x44c/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf9738ec29
Code: Unable to access opcode bytes at 0x7fcf9738ebff.
RSP: 002b:00007ffcd799c2e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcf9738ec29
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffcd799c34c R08: 0000001ed799c3df R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000000000d8
R13: 00000000000927c0 R14: 00000000000482ae R15: 00007ffcd799c3a0
 </TASK>
