rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=5d14/1/0x4000000000000000 softirq=58160/58160 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12251/1:b..l P12339/3:b..l P12253/1:b..l
rcu: 	(detected by 0, t=10505 jiffies, g=47933, q=687 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12356 Comm: syz.3.1446 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:lock_acquire+0x58/0x360
Code: 8b 05 2c c1 ae 10 48 89 44 24 58 0f 1f 44 00 00 65 8b 05 2f c1 ae 10 83 f8 08 0f 83 b8 01 00 00 89 c0 48 0f a3 05 18 c6 c0 0d <73> 16 e8 e1 05 09 00 84 c0 75 0d f6 05 de c1 aa 0d 01 0f 84 d7 01
RSP: 0018:ffffc900001e07e0 EFLAGS: 00000097
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888136627ad8
RBP: ffffffff81ac490b R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1026cc4f59 R12: 0000000000000000
R13: ffff888136627ad8 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f0d972ce6c0(0000) GS:ffff8881a4173000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000003ec48000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/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 eb bf ae 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900030978a0 EFLAGS: 00000206
RAX: 7798b5a2c8c1a100 RBX: 0000000000000000 RCX: 7798b5a2c8c1a100
RDX: 0000000000000000 RSI: ffffffff8d71ebcb RDI: ffffffff8b9ec2e0
RBP: ffffffff8b30415c R08: 0000000000000000 R09: ffffffff8b30415c
R10: dffffc0000000000 R11: fffffbfff1eb9aa7 R12: 0000000000000002
R13: ffffffff8dd3a960 R14: 0000000000000000 R15: 0000000000000246
 mt_find+0x17d/0x5f0
 find_vma+0xe7/0x160
 lock_mm_and_find_vma+0x5f/0x300
 do_user_addr_fault+0x331/0x1380
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x51/0x90
Code: 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 eb 05 e9 7f 0e 04 00 <48> 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01
RSP: 0018:ffffc90003097cf8 EFLAGS: 00010202
RAX: 00007ffffffff001 RBX: 0000000000000048 RCX: 0000000000000048
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffc90003097d60
RBP: ffffc90003097eb8 R08: ffffc90003097da7 R09: 1ffff92000612fb4
R10: dffffc0000000000 R11: fffff52000612fb5 R12: 1ffff92000612fa8
R13: 0000000000000048 R14: ffffc90003097d60 R15: 0000000000000000
 _copy_from_user+0x7a/0xb0
 __sys_bpf+0x1e3/0x860
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d9638ec29
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:00007f0d972ce038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f0d965d5fa0 RCX: 00007f0d9638ec29
RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f0d96411e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d965d6038 R14: 00007f0d965d5fa0 R15: 00007ffe9d329408
 </TASK>
task:syz.8.1421      state:R  running task     stack:14256 pid:12253 tgid:12253 ppid:12076  task_flags:0x400640 flags:0x00080001
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_is_held_type+0x137/0x190
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 39 62 13 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90002bfe770 EFLAGS: 00000206
RAX: b797925240938f00 RBX: 0000000000000001 RCX: b797925240938f00
RDX: ffff888026afd700 RSI: ffffffff8d71ebcb RDI: ffffffff8b9ec2e0
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff81f6900d
R10: ffffc90002bfe8c0 R11: fffff5200057fd1b R12: 0000000000000246
R13: ffff888026afd700 R14: ffffffff8dd3a960 R15: 0000000000000002
 xas_start+0x295/0x770
 xas_load+0x2c/0x5b0
 filemap_get_entry+0x168/0x2f0
 shmem_get_folio_gfp+0x237/0x1660
 shmem_write_begin+0xf7/0x2b0
 generic_perform_write+0x2c5/0x900
 shmem_file_write_iter+0xf8/0x120
 __kernel_write_iter+0x428/0x910
 dump_user_range+0x8a0/0xc90
 elf_core_dump+0x3364/0x3960
 coredump_write+0x1169/0x1900
 vfs_coredump+0x1daa/0x2a50
 get_signal+0x1108/0x1340
 arch_do_signal_or_restart+0xa0/0x790
 irqentry_exit_to_user_mode+0x7e/0x110
 exc_general_protection+0x171/0x200
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7f5d07d8ec31
RSP: 002b:0000200000000040 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f5d07fd6180 RCX: 00007f5d07d8ec29
RDX: 00002000000000c0 RSI: 0000200000000040 RDI: 0000000000048000
RBP: 00007f5d07e11e41 R08: 0000200000000200 R09: 0000200000000200
R10: 0000200000000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f5d07fd6218 R14: 00007f5d07fd6180 R15: 00007ffe69728d38
 </TASK>
task:syz.9.1442      state:R  running task     stack:22200 pid:12339 tgid:12339 ppid:11841  task_flags:0x400640 flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock+0x3f/0x50
 filemap_map_pages+0x1121/0x1740
 __handle_mm_fault+0x34ac/0x5440
 handle_mm_fault+0x40a/0x8e0
 __get_user_pages+0x1699/0x2ce0
 get_dump_page+0x1ac/0x3f0
 dump_user_range+0x1de/0xc90
 elf_core_dump+0x3364/0x3960
 coredump_write+0x1169/0x1900
 vfs_coredump+0x1daa/0x2a50
 get_signal+0x1108/0x1340
 arch_do_signal_or_restart+0xa0/0x790
 irqentry_exit_to_user_mode+0x7e/0x110
 exc_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fd04e78ec31
RSP: 002b:00000000fffffeb0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fd04e9d6090 RCX: 00007fd04e78ec29
RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400
RBP: 00007fd04e811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fd04e9d6128 R14: 00007fd04e9d6090 R15: 00007ffd9da41308
 </TASK>
task:syz.8.1421      state:R  running task     stack:21648 pid:12251 tgid:12251 ppid:12076  task_flags:0x40064c flags:0x00080001
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+0x1285/0x1340
 arch_do_signal_or_restart+0xa0/0x790
 irqentry_exit_to_user_mode+0x7e/0x110
 exc_general_protection+0x171/0x200
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7f5d07d8ec31
RSP: 002b:0000200000000040 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f5d07fd6180 RCX: 00007f5d07d8ec29
RDX: 00002000000000c0 RSI: 0000200000000040 RDI: 0000000000048000
RBP: 00007f5d07e11e41 R08: 0000200000000200 R09: 0000200000000200
R10: 0000200000000140 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f5d07fd6218 R14: 00007f5d07fd6180 R15: 00007ffe69728d38
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g47933 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=22000
rcu: rcu_preempt kthread starved for 10505 jiffies! g47933 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26992 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
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>
