rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=31c4/1/0x4000000000000000 softirq=38519/38521 fqs=2
rcu: 	(t=10500 jiffies g=26677 q=475 ncpus=2)
rcu: rcu_preempt kthread starved for 10496 jiffies! g26677 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:26536 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11371 Comm: syz.6.2374 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:ffffc90002edf800 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff888101683308 RCX: ffffffff8b71260c
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888101683308
RBP: ffffc90002edf8f8 R08: ffff88810168330b R09: 1ffff110202d0661
R10: dffffc0000000000 R11: ffffed10202d0662 R12: 1ffff920005dbf08
R13: 0000000000000001 R14: ffffc90002edf860 R15: 1ffff110202d0661
FS:  00005555655b3500(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d4d5c CR3: 0000000112516000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0100000000000000 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: 0033:0x7fba70b8eb69
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:00007ffede2343b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000002ce83 RCX: 00007fba70b8eb69
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fba70db5fac
RBP: 0000000000000032 R08: 7fffffffffffffff R09: 00000015de2346af
R10: 00007ffede2344b0 R11: 0000000000000246 R12: 00007fba70db5fac
R13: 00007ffede2344b0 R14: 000000000002ceb5 R15: 00007ffede2344d0
 </TASK>
CPU: 1 UID: 0 PID: 11372 Comm: syz.6.2374 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_core+0xb1f/0x1710
Code: 00 9c 8f 84 24 00 01 00 00 f6 84 24 01 01 00 00 02 0f 85 a2 08 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 4c 8b 34 25 08 10 a0 92 <48> 8d bc 24 60 01 00 00 e8 d4 2e 00 00 48 89 c3 48 85 c0 48 8b 44
RSP: 0018:ffffc900001e0be0 EFLAGS: 00000206
RAX: c8ce3dc0e3084000 RBX: ffff88813663b068 RCX: c8ce3dc0e3084000
RDX: 0000000000000002 RSI: ffffffff8d998701 RDI: ffffffff8be29f80
RBP: ffffc900001e0e30 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: dffffc0000000000
R13: 1ffff11026cc75fa R14: ffff8880232d3980 R15: 000000000000000a
FS:  00007fba719be6c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000112516000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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_mark+0x5c/0x220
Code: 30 00 74 08 48 89 df e8 e2 06 6f 00 48 8b 1b 4c 8d 6b 28 4c 89 ef be 04 00 00 00 e8 6e 09 6f 00 bd 01 00 00 00 f0 0f c1 6b 28 <31> ff 89 ee e8 5b e7 0b 00 85 ed 0f 84 ac 00 00 00 bf fe ff ff 7f
RSP: 0018:ffffc90002c3fba8 EFLAGS: 00000202
RAX: 1ffff920005dbf01 RBX: ffff888123fcb980 RCX: ffffffff81b43a92
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888123fcb9a8
RBP: 0000000000000001 R08: ffff888123fcb9ab R09: 1ffff110247f9735
R10: dffffc0000000000 R11: ffffed10247f9736 R12: ffffc90002edfaa0
R13: ffff888123fcb9a8 R14: dffffc0000000000 R15: ffffc90002c3fc80
 futex_wake+0x37a/0x500
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba70b8eb69
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:00007fba719be0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fba70db5fa8 RCX: 00007fba70b8eb69
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fba70db5fac
RBP: 00007fba70db5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fba70db5fac
R13: 0000000000000000 R14: 00007ffede234170 R15: 00007ffede234258
 </TASK>
sched: DL replenish lagged too much
