rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=a264/1/0x4000000000000000 softirq=16901/16909 fqs=1
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6174/1:b..l P6211/1:b..l
rcu: 	(detected by 0, t=10506 jiffies, g=9797, q=313 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6222 Comm: syz.4.53 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:check_preemption_disabled+0x40/0x120
Code: 08 65 8b 05 16 4d 13 07 65 8b 0d 0b 4d 13 07 f7 c1 ff ff ff 7f 74 23 65 48 8b 0d eb 4c 13 07 48 3b 4c 24 08 0f 85 cc 00 00 00 <48> 83 c4 10 5b 41 5e 41 5f 5d e9 51 ca 02 00 cc 48 c7 04 24 00 00
RSP: 0018:ffffc900001e0788 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: cdd618406a171300
RDX: 0000000000000000 RSI: ffffffff8b9ec2c0 RDI: ffffffff8b9ec280
RBP: ffffffff81ac490b R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1026cc4f59 R12: 0000000000000000
R13: ffff888136627ad8 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f19111da6c0(0000) GS:ffff8881a4173000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000111a1e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_is_watching+0x15/0xb0
 lock_acquire+0x5f/0x360
 _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:bsearch+0x9/0xc0
Code: 0f bc c3 5b c3 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 <41> 55 41 54 53 50 4c 89 04 24 49 89 ce 49 89 d7 49 89 f4 49 89 fd
RSP: 0018:ffffc90002c4f8a0 EFLAGS: 00000287
RAX: ffffffff8b2c5c6e RBX: ffffffff84bc389c RCX: 000000000000000c
RDX: 000000000000093b RSI: ffffffff8d91d390 RDI: ffffc90002c4f8e0
RBP: ffffc90002c4f960 R08: ffffffff8b2c5ce0 R09: 1ffff1100478383e
R10: dffffc0000000000 R11: ffffed100478383f R12: dffffc0000000000
R13: 1ffff92000589f18 R14: 000000000000093b R15: ffffffff8d91d390
 search_extable+0x8f/0xd0
 search_exception_tables+0x3a/0x60
 fixup_exception+0xad/0x1d30
 kernelmode_fixup_or_oops+0x68/0xf0
 __bad_area_nosemaphore+0x11a/0x780
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:strncpy_from_user+0x1bc/0x290
Code: c1 e8 03 49 01 c4 e9 8d 00 00 00 e8 5e 3d 02 fd 48 f7 dd 49 89 ec 48 8b 1c 24 31 ff 4c 89 ee e8 2a 42 02 fd 49 83 ed 01 72 44 <43> 8a 2c 27 4a 8d 3c 23 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00
RSP: 0018:ffffc90002c4fd30 EFLAGS: 00010212
RAX: ffffffff84bc3896 RBX: ffff88811f5d1120 RCX: ffff88802118d700
RDX: 0000000000000002 RSI: 0000000000000fe0 RDI: 0000000000000000
RBP: fffffffffffffff8 R08: ffff88811f5d20ff R09: 1ffff11023eba41f
R10: dffffc0000000000 R11: ffffed1023eba420 R12: 0000000000000000
R13: 0000000000000fdf R14: 0000000000000fe0 R15: 0000000000000000
 getname_flags+0xf3/0x540
 do_sys_openat2+0xbc/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f191038ec29
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:00007f19111da038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f19105d5fa0 RCX: 00007f191038ec29
RDX: 00000000000026e1 RSI: 0000000000000000 RDI: ffffffffffffff9c
RBP: 00007f1910411e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f19105d6038 R14: 00007f19105d5fa0 R15: 00007ffd4a576178
 </TASK>
task:syz.4.49        state:R  running task     stack:20688 pid:6211  tgid:6211  ppid:6019   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:unwind_next_frame+0x12ee/0x2390
Code: 89 de e8 b5 1b b5 ff e9 43 06 00 00 49 89 d5 48 89 d5 48 89 d8 48 29 e8 48 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe <4c> 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00
RSP: 0018:ffffc90002f5dfd8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8f6f725c RCX: 0000000000000000
RDX: ffffffff8f6f725c RSI: ffffffff8fe94dd6 RDI: ffffffff8b9ec280
RBP: ffffffff8f6f725c R08: 0000000000000007 R09: ffffffff81725d05
R10: ffffc90002f5e158 R11: fffff520005ebc2d R12: ffffffff8168fa43
R13: ffffffff8f6f725c R14: ffffc90002f5e108 R15: ffffffff8f6f7260
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __set_page_owner+0x8d/0x4a0
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 folio_alloc_mpol_noprof+0x39/0x70
 shmem_alloc_and_add_folio+0x447/0xf60
 shmem_get_folio_gfp+0x59d/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_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f191038ec31
RSP: 002b:00000000fffffeb0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f19105d5fa0 RCX: 00007f191038ec29
RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400
RBP: 00007f1910411e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f19105d6038 R14: 00007f19105d5fa0 R15: 00007ffd4a576178
 </TASK>
task:syz.2.41        state:R  running task     stack:20656 pid:6174  tgid:6174  ppid:5821   task_flags:0x40064c flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:unwind_next_frame+0x199/0x2390
Code: 04 28 84 c0 0f 85 3c 1b 00 00 4c 89 6c 24 50 4c 89 64 24 20 4c 89 7c 24 48 48 89 5c 24 10 0f b6 1b 48 8b 44 24 30 80 3c 28 00 <4c> 8b 7c 24 18 74 08 4c 89 ff e8 f8 c1 b0 00 4d 8b 27 48 83 f3 01
RSP: 0018:ffffc90002b6edb8 EFLAGS: 00000246
RAX: 1ffff9200056ddda RBX: 0000000000000000 RCX: ea12e505296a0900
RDX: 0000000000000001 RSI: ffffffff8b9ec2c0 RDI: ffffffff8b9ec280
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff81725d05
R10: ffffc90002b6eed8 R11: ffffffff81aaefd0 R12: 1ffff9200056ddd1
R13: ffffc90002b6eed8 R14: ffffc90002b6ee88 R15: ffffffff81725d05
 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_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fc5c418ec31
RSP: 002b:00000000fffffeb0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fc5c43d5fa0 RCX: 00007fc5c418ec29
RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400
RBP: 00007fc5c4211e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fc5c43d6038 R14: 00007fc5c43d5fa0 R15: 00007ffe213704a8
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g9797 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:27320 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>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6224 Comm: syz.4.53 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+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 a6 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 51 6f 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 35 6f
RSP: 0018:ffffc90002dbf540 EFLAGS: 00000246
RAX: ffffffff81b306ab RBX: 1ffff11026cc7f61 RCX: 0000000000080000
RDX: ffffc90003952000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90002dbf6c0 R08: ffffffff8f5cd537 R09: 1ffffffff1eb9aa6
R10: dffffc0000000000 R11: fffffbfff1eb9aa7 R12: ffff88813663fb08
R13: dffffc0000000000 R14: ffff88804b23b1c0 R15: 0000000000000001
FS:  00007f19111b96c0(0000) GS:ffff8880b8d73000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34c1bff8 CR3: 0000000111a1e000 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
 dup_mmap+0x15a0/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x1706/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f191038ec29
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:00007f19111b8fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f19105d6090 RCX: 00007f191038ec29
RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400
RBP: 00007f1910411e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f19105d6128 R14: 00007f19105d6090 R15: 00007ffd4a576178
 </TASK>
