rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10536 ticks this GP) idle=52c4/1/0x4000000000000000 softirq=17252/17254 fqs=4984
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1125806          0            0
rcu: 	cputime:    25222      27257           83   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=11489 q=3166 ncpus=2)
CPU: 1 UID: 0 PID: 6574 Comm: syz.2.201 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: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 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 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001e05a0 EFLAGS: 00000206
RAX: 0d18c30e212fee00 RBX: 1ffff9200003c0bc RCX: 0d18c30e212fee00
RDX: 0000000000000003 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc900001e0698 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f08827616c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000027f2a000 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
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 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:mas_next_node+0x1/0xd60
Code: 80 c1 03 38 c1 0f 8c 7f fa ff ff 4c 89 e7 e8 36 80 ba f6 e9 72 fa ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 68 49 89 d6 49 89 f4 48 89 fb
RSP: 0018:ffffc900070d7818 EFLAGS: 00000207
RAX: ffffffff8b666f29 RBX: 000055557af49fff RCX: ffff888023d35640
RDX: ffffffffffffffff RSI: ffff88801b757c00 RDI: ffffc900070d7a00
RBP: 000055557af49fff R08: ffff888023d35640 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88801b757c00 R14: ffffc900070d7a10 R15: ffffffffffffffff
 mas_next_slot+0x407/0xcf0
 mas_find+0x9e7/0xc10
 acct_collect+0x1e1/0x770
 do_exit+0x5c3/0x22e0
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f088198e9a9
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:00007f0882761038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffea RBX: 00007f0881bb5fa0 RCX: 00007f088198e9a9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000500
RBP: 00007f0881a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0881bb5fa0 R15: 00007ffeec985778
 </TASK>
sched: DL replenish lagged too much
