rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10475 ticks this GP) idle=8d5c/1/0x4000000000000000 softirq=20255/20259 fqs=4
rcu: 	(t=10501 jiffies g=13537 q=488 ncpus=2)
rcu: rcu_preempt kthread starved for 10493 jiffies! g13537 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:27320 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: 7187 Comm: syz.3.550 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a-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: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 c4 1d b2 f6 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90002e7fa00 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff888100ad9908 RCX: ffffffff8b71260c
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888100ad9908
RBP: ffffc90002e7faf8 R08: ffff888100ad990b R09: 1ffff1102015b321
R10: dffffc0000000000 R11: ffffed102015b322 R12: 1ffff920005cff48
R13: 0000000000000001 R14: ffffc90002e7fa60 R15: 1ffff1102015b321
FS:  0000555560d13500(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2eb1aff8 CR3: 000000003981c000 CR4: 00000000000006f0
DR0: 0000200000000300 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_wake+0x1cc/0x500
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f657418e9a9
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:00007ffea8635208 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f65743b5fa8 RCX: 00007f657418e9a9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f65743b5fa8
RBP: 0000000000000000 R08: 0000000000000020 R09: 00000005a86354ff
R10: 00007f65743b5fa0 R11: 0000000000000246 R12: 00007f65743b5fac
R13: 00007f65743b5fa0 R14: 0000000000001c46 R15: 0000000000000003
 </TASK>
CPU: 0 UID: 0 PID: 7188 Comm: syz.3.550 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a-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:rcu_read_unlock_special+0x87/0x4c0
Code: 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 92 37 f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000075e0 EFLAGS: 00000206
RAX: d162e6f2d2fde000 RBX: 1ffff92000000ec4 RCX: d162e6f2d2fde000
RDX: 0000000000000002 RSI: ffffffff8d99873a RDI: ffffffff8be29f80
RBP: ffffc900000076d8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f6574fd06c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2eb1bff8 CR3: 000000003981c000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kmem_cache_free+0x18f/0x400
 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:_raw_spin_unlock+0x0/0x50
Code: 48 83 c4 08 48 89 df 5b 41 5e e9 fb be 2d f6 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 9a 2b 2d f6
RSP: 0018:ffffc9000277f9a0 EFLAGS: 00000282
RAX: 1ffff920004eff59 RBX: ffff888100ad9908 RCX: 0000000000080000
RDX: ffffc9000f989000 RSI: 0000000000000540 RDI: ffff888100ad9908
RBP: dffffc0000000000 R08: ffff8880217b1cdb R09: 1ffff110042f639b
R10: dffffc0000000000 R11: ffffed10042f639c R12: ffff8880217b1cc0
R13: ffffc9000277fa01 R14: ffffffff81b45d61 R15: ffff8880217b1cc0
 futex_wait_setup+0x3d6/0x460
 __futex_wait+0x148/0x3e0
 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: 0033:0x7f657418e9a9
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:00007f6574fd00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f65743b5fa8 RCX: 00007f657418e9a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f65743b5fa8
RBP: 00007f65743b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f65743b5fac
R13: 0000000000000000 R14: 00007ffea8634fc0 R15: 00007ffea86350a8
 </TASK>
sched: DL replenish lagged too much
