rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=f63c/1/0x4000000000000000 softirq=56757/56757 fqs=5248
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   977704          0            0
rcu: 	cputime:    24049      28440           93   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=48097 q=3043 ncpus=2)
CPU: 0 UID: 0 PID: 14897 Comm: syz.4.2676 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+0xbc/0x4c0
Code: 04 2b 00 00 00 00 66 42 c7 44 2b 09 00 00 42 c6 44 2b 0b 00 65 48 8b 05 22 2c f8 10 48 3b 84 24 a0 00 00 00 0f 85 65 03 00 00 <48> 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 81 7f c9 09 cc 49 89
RSP: 0018:ffffc900000075a0 EFLAGS: 00000246
RAX: f8b333ed472e2700 RBX: 1ffff92000000ebc RCX: f8b333ed472e2700
RDX: 0000000000000002 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc90000007698 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f98e4e9f6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3b6e60 CR3: 000000002dad0000 CR4: 00000000000006f0
DR0: 0000000000000000 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
 kfree+0x18e/0x440
 slab_free_after_rcu_debug+0x60/0x2a0
 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:___slab_alloc+0x4ab/0x1480
Code: 04 24 00 02 00 00 0f 84 bb fb ff ff fb 89 dd e9 b3 fb ff ff e8 c6 b4 55 09 f7 c3 00 02 00 00 0f 84 98 fe ff ff fb 8b 6c 24 08 <eb> 1a 48 8b 74 24 08 48 c7 46 10 00 00 00 00 4c 8b 6c 24 10 4c 89
RSP: 0018:ffffc90003c976b8 EFLAGS: 00000206
RAX: f8b333ed472e2700 RBX: 0000000000000246 RCX: f8b333ed472e2700
RDX: 0000000000000006 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: 00000000ffffffff R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: ffff88801b68e140 R14: ffff88804b040440 R15: ffff88804b040460
 kmem_cache_alloc_noprof+0x283/0x3c0
 anon_vma_fork+0xde/0x500
 dup_mmap+0x9eb/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: 0033:0x7f98e3f8e9a9
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:00007f98e4e9efe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f98e41b5fa0 RCX: 00007f98e3f8e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000008c180400
RBP: 00007f98e4010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f98e41b5fa0 R15: 00007fff6b4c1998
 </TASK>
sched: DL replenish lagged too much
