rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6700
rcu: 	(detected by 0, t=10502 jiffies, g=8849, q=2909 ncpus=2)
task:syz.1.279       state:R  running task     stack:25616 pid:6700  tgid:6697  ppid:5827   task_flags:0x400140 flags:0x0000400e
Call Trace:
 <IRQ>
 sched_show_task+0x49d/0x630
 print_other_cpu_stall+0xfa6/0x1370
 rcu_sched_clock_irq+0x9d1/0x1090
 update_process_times+0x23c/0x2f0
 tick_nohz_handler+0x39a/0x520
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:number+0xad5/0xf60
Code: c1 0f 8c 7b ff ff ff 48 89 df e8 56 6e b8 f6 e9 6e ff ff ff e8 bc 49 55 f6 4d 01 e6 49 83 c6 04 b8 ff ff ff ff 48 89 44 24 18 <8b> 5c 24 3c 89 df 4c 8b 7c 24 50 44 89 fe e8 58 4b 55 f6 44 39 fb
RSP: 0018:ffffc90000006f80 EFLAGS: 00000246
RAX: 00000000fffffffe RBX: 00000000ffffffff RCX: ffff888023d9b980
RDX: 0000000000000100 RSI: 00000000fffffffe RDI: 00000000ffffffff
RBP: ffffc900000070a0 R08: ffffc90000007017 R09: 0000000000000000
R10: ffffc90000007000 R11: fffff52000000e03 R12: 00000000fffffffe
R13: 0000000000000003 R14: ffffc90000007383 R15: 00000000ffff0a00
 vsnprintf+0x91b/0xf00
 sprintf+0xd9/0x120
 info_print_prefix+0x155/0x310
 record_print_text+0x154/0x430
 printk_get_next_message+0x26d/0x7b0
 console_flush_all+0x4ca/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 clocksource_watchdog+0xdca/0x11c0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0x67/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 1d 21 f6 e8 c6 f0 57 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000273f120 EFLAGS: 00000282
RAX: 4a178463a1675700 RBX: 0000000000000000 RCX: 4a178463a1675700
RDX: 0000000000000006 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc9000273f1c0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920004e7e24
 irqentry_exit+0x6f/0x90
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:rcu_read_unlock_special+0x7e/0x4c0
Code: 24 40 48 c1 eb 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 62 2c f8 10 <41> f7 c6 00 00 f0 00 74 49 48 c7 44 24 40 0e 36 e0 45 4a c7 04 2b
RSP: 0018:ffffc9000273f280 EFLAGS: 00000a02
RAX: f2f2f200f1f1f1f1 RBX: 1ffff920004e7e58 RCX: 4a178463a1675700
RDX: 0000000000000003 RSI: ffffffff8db8655b RDI: ffff888023d9b980
RBP: ffffc9000273f380 R08: ffff888026cfecc3 R09: 1ffff11004d9fd98
R10: dffffc0000000000 R11: ffffed1004d9fd99 R12: 1ffff110047b37b8
R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000
 __rcu_read_unlock+0x84/0xe0
 copy_pmd_range+0x67b9/0x7000
 copy_page_range+0xc46/0x1270
 dup_mmap+0xf57/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x16d3/0x3b80
 kernel_clone+0x21e/0x870
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb84298e9a9
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:00007fb8437f8fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fb842bb5fa0 RCX: 00007fb84298e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011
RBP: 00007fb842a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb842bb5fa0 R15: 00007fff73dde688
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g8849 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=3468
rcu: rcu_preempt kthread starved for 10502 jiffies! g8849 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:26728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x16f5/0x4d00
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6700 Comm: syz.1.279 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e-dirty #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:number+0xad5/0xf60
Code: c1 0f 8c 7b ff ff ff 48 89 df e8 56 6e b8 f6 e9 6e ff ff ff e8 bc 49 55 f6 4d 01 e6 49 83 c6 04 b8 ff ff ff ff 48 89 44 24 18 <8b> 5c 24 3c 89 df 4c 8b 7c 24 50 44 89 fe e8 58 4b 55 f6 44 39 fb
RSP: 0018:ffffc90000006f80 EFLAGS: 00000246
RAX: 00000000fffffffe RBX: 00000000ffffffff RCX: ffff888023d9b980
RDX: 0000000000000100 RSI: 00000000fffffffe RDI: 00000000ffffffff
RBP: ffffc900000070a0 R08: ffffc90000007017 R09: 0000000000000000
R10: ffffc90000007000 R11: fffff52000000e03 R12: 00000000fffffffe
R13: 0000000000000003 R14: ffffc90000007383 R15: 00000000ffff0a00
FS:  00007fb8437f96c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3125cb CR3: 0000000026b0e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 vsnprintf+0x91b/0xf00
 sprintf+0xd9/0x120
 info_print_prefix+0x155/0x310
 record_print_text+0x154/0x430
 printk_get_next_message+0x26d/0x7b0
 console_flush_all+0x4ca/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 clocksource_watchdog+0xdca/0x11c0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0x67/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 1d 21 f6 e8 c6 f0 57 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000273f120 EFLAGS: 00000282
RAX: 4a178463a1675700 RBX: 0000000000000000 RCX: 4a178463a1675700
RDX: 0000000000000006 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc9000273f1c0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920004e7e24
 irqentry_exit+0x6f/0x90
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:rcu_read_unlock_special+0x7e/0x4c0
Code: 24 40 48 c1 eb 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 62 2c f8 10 <41> f7 c6 00 00 f0 00 74 49 48 c7 44 24 40 0e 36 e0 45 4a c7 04 2b
RSP: 0018:ffffc9000273f280 EFLAGS: 00000a02
RAX: f2f2f200f1f1f1f1 RBX: 1ffff920004e7e58 RCX: 4a178463a1675700
RDX: 0000000000000003 RSI: ffffffff8db8655b RDI: ffff888023d9b980
RBP: ffffc9000273f380 R08: ffff888026cfecc3 R09: 1ffff11004d9fd98
R10: dffffc0000000000 R11: ffffed1004d9fd99 R12: 1ffff110047b37b8
R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000
 __rcu_read_unlock+0x84/0xe0
 copy_pmd_range+0x67b9/0x7000
 copy_page_range+0xc46/0x1270
 dup_mmap+0xf57/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x16d3/0x3b80
 kernel_clone+0x21e/0x870
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb84298e9a9
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:00007fb8437f8fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fb842bb5fa0 RCX: 00007fb84298e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011
RBP: 00007fb842a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb842bb5fa0 R15: 00007fff73dde688
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6700 Comm: syz.1.279 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e-dirty #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:asm_sysvec_irq_work+0x0/0x20
Code: 16 74 6e 0a e9 41 05 00 00 90 f3 0f 1e fa 0f 1f 00 fc 6a ff e8 f1 03 00 00 48 89 c4 48 89 e7 e8 f6 52 6e 0a e9 21 05 00 00 90 <f3> 0f 1e fa 0f 1f 00 fc 6a ff e8 d1 03 00 00 48 89 c4 48 89 e7 e8
RSP: 0018:ffffc90000007258 EFLAGS: 00000046
RAX: 1ffffffff1c0ae1d RBX: 00000000ffffe000 RCX: 000000000000000d
RDX: 0000000000000100 RSI: 000000000000000d RDI: 0000000000000020
RBP: ffffc90000007400 R08: ffffc90000007557 R09: 0000000000000000
R10: ffffc90000007500 R11: fffff52000000eab R12: dffffc0000000000
R13: 000000000000000d R14: ffffffff8e057160 R15: ffffc90000007410
FS:  00007fb8437f96c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3125cb CR3: 0000000026b0e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
RIP: 0010:_prb_read_valid+0x1b4/0xa90
Code: 89 ee e8 2f db 1d 00 49 83 fd 1f 0f 87 fe 06 00 00 e8 e0 d6 1d 00 bb ff ff ff ff 44 89 e9 d3 e3 48 8b 44 24 70 42 80 3c 20 00 <4c> 8b 64 24 60 74 08 4c 89 e7 e8 ed fa 80 00 f7 d3 48 8b 54 24 30
RSP: 0018:ffffc90000007280 EFLAGS: 00000246
 prb_read_valid+0x3c/0x60
 printk_get_next_message+0x15c/0x7b0
 console_flush_all+0x4ca/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 clocksource_watchdog+0xdca/0x11c0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0x67/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 1d 21 f6 e8 c6 f0 57 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000273f120 EFLAGS: 00000282
RAX: 4a178463a1675700 RBX: 0000000000000000 RCX: 4a178463a1675700
RDX: 0000000000000006 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc9000273f1c0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920004e7e24
 irqentry_exit+0x6f/0x90
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:rcu_read_unlock_special+0x7e/0x4c0
Code: 24 40 48 c1 eb 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 62 2c f8 10 <41> f7 c6 00 00 f0 00 74 49 48 c7 44 24 40 0e 36 e0 45 4a c7 04 2b
RSP: 0018:ffffc9000273f280 EFLAGS: 00000a02
RAX: f2f2f200f1f1f1f1 RBX: 1ffff920004e7e58 RCX: 4a178463a1675700
RDX: 0000000000000003 RSI: ffffffff8db8655b RDI: ffff888023d9b980
RBP: ffffc9000273f380 R08: ffff888026cfecc3 R09: 1ffff11004d9fd98
R10: dffffc0000000000 R11: ffffed1004d9fd99 R12: 1ffff110047b37b8
R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000
 __rcu_read_unlock+0x84/0xe0
 copy_pmd_range+0x67b9/0x7000
 copy_page_range+0xc46/0x1270
 dup_mmap+0xf57/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x16d3/0x3b80
 kernel_clone+0x21e/0x870
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb84298e9a9
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:00007fb8437f8fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fb842bb5fa0 RCX: 00007fb84298e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011
RBP: 00007fb842a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb842bb5fa0 R15: 00007fff73dde688
 </TASK>
