rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10480 ticks this GP) idle=bdbc/1/0x4000000000000000 softirq=23931/23935 fqs=8
rcu: 	(t=10501 jiffies g=14421 q=690 ncpus=2)
rcu: rcu_preempt kthread starved for 10485 jiffies! g14421 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8382 Comm: syz.4.1085 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e #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:native_queued_spin_lock_slowpath+0xaf/0x8e0
Code: 00 00 00 c7 44 24 60 00 00 00 00 0f 1f 44 00 00 4c 8d 74 24 60 49 89 df 49 c1 ef 03 41 bd 01 00 00 00 eb 06 89 44 24 60 f3 90 <48> 89 df be 04 00 00 00 e8 94 28 b2 f6 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc9000173f800 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff88801d2aef08 RCX: ffffffff8b71260c
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88801d2aef08
RBP: ffffc9000173f8f8 R08: ffff88801d2aef0b R09: 1ffff11003a55de1
R10: dffffc0000000000 R11: ffffed1003a55de2 R12: 1ffff920002e7f08
R13: 0000000000000001 R14: ffffc9000173f860 R15: 1ffff11003a55de1
FS:  000055557c03e500(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40ffab9fc8 CR3: 000000010f510000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 queued_spin_lock_slowpath+0x43/0x50
 do_raw_spin_lock+0x21f/0x290
 futex_unqueue+0xf6/0x240
 __futex_wait+0x223/0x3e0
 futex_wait+0x104/0x360
 do_futex+0x333/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9eb158e9a9
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:00007ffcddd35e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000020bd3 RCX: 00007f9eb158e9a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9eb17b5fac
RBP: 0000000000000032 R08: 7fffffffffffffff R09: 00000002ddd3614f
R10: 00007ffcddd35f50 R11: 0000000000000246 R12: 00007f9eb17b5fac
R13: 00007ffcddd35f50 R14: 0000000000020c05 R15: 00007ffcddd35f70
 </TASK>
CPU: 0 UID: 0 PID: 8384 Comm: syz.4.1085 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e #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:arch_stack_walk+0x123/0x150
Code: 29 09 00 48 85 c0 74 24 48 89 df 48 89 c6 4d 89 f3 2e e8 a0 d9 07 0a 84 c0 74 11 4c 89 ff e8 14 2b 09 00 83 bd 78 ff ff ff 00 <75> cf 65 48 8b 05 e3 90 36 11 48 3b 45 d8 75 12 48 83 c4 68 5b 41
RSP: 0018:ffffc90000007808 EFLAGS: 00000202
RAX: 0000000002defc01 RBX: ffffc900000078c0 RCX: 7716a36da7b02900
RDX: 0000000000000002 RSI: ffffffff8d998836 RDI: ffffffff8be29f40
RBP: ffffc90000007890 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff88801f4bb980
R13: ffffffff81a8c254 R14: ffffffff81ad0050 R15: ffffc90000007808
FS:  00007f9eb23296c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32f5ffff CR3: 000000010f510000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 slab_free_after_rcu_debug+0x129/0x2a0
 rcu_core+0xca8/0x1710
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:futex_wake+0x24a/0x500
Code: c3 30 0f 84 7d 01 00 00 4d 8d 77 38 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 4e 02 6f 00 4d 8b 36 4c 8b 64 24 68 <4c> 89 f7 4c 89 e6 e8 5b e1 0b 00 4d 39 e6 0f 85 53 01 00 00 48 89
RSP: 0018:ffffc90002defbe0 EFLAGS: 00000246
RAX: 1ffff920002e7f5e RBX: ffffc9000173fae8 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90002defb60
RBP: ffffc90002defcf0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520005bdf6c R12: 00007f9eb17b5000
R13: ffff88801d2aef48 R14: 00007f9eb17b5000 R15: ffffc9000173fab8
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9eb158e9a9
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:00007f9eb23290e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f9eb17b5fa8 RCX: 00007f9eb158e9a9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9eb17b5fac
RBP: 00007f9eb17b5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007f9eb17b5fac
R13: 0000000000000000 R14: 00007ffcddd35c10 R15: 00007ffcddd35cf8
 </TASK>
sched: DL replenish lagged too much
