rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (8237 ticks this GP) idle=ec44/1/0x4000000000000000 softirq=87773/87775 fqs=5126
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1273245         21            0
rcu: 	cputime:    34950      17522           36   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=88913 q=2424 ncpus=2)
CPU: 0 UID: 0 PID: 19878 Comm: syz.4.3543 Not tainted syzkaller #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:lock_release+0x7/0x3d0
Code: fe ff ff 41 be 2f 00 00 00 e9 0e ff ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 30 49 89 f5 49 89 fe 65 48 8b 05 c0
RSP: 0018:ffffc90000007460 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff912e8401 RCX: 0000000000000102
RDX: ffffc90000007501 RSI: ffffffff8175b995 RDI: ffffffff8e560120
RBP: dffffc0000000000 R08: ffffc9000964ff38 R09: 0000000000000000
R10: ffffc90000007598 R11: fffff52000000eb5 R12: ffffc9000964ff48
R13: ffffc90009648000 R14: ffffc90000007548 R15: ffffffff8175b995
FS:  00007fedcd3ae6c0(0000) GS:ffff88818e0a4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34d0cff8 CR3: 00000001a1f38000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x1aaa/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_mempool_unpoison_object+0x9f/0x130
 napi_skb_cache_get+0x3c8/0x780
 __alloc_skb+0x146/0x7d0
 napi_alloc_skb+0x84/0x7a0
 e1000_clean_rx_irq+0x448/0x11a0
 e1000_clean+0xcaa/0x2b10
 __napi_poll+0xae/0x320
 net_rx_action+0x696/0xe30
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_read_unlock_special+0x1d/0x480
Code: 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 10 65 8b 2d 8b ad 4d 11 f7 c5 00 00 f0 00 74 14 <48> 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 49 89
RSP: 0018:ffffc9000964eec8 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000000000001
RDX: 0000000000000006 RSI: ffffffff8dcf1fb8 RDI: ffffffff8c076d00
RBP: ffff88818e0a4000 R08: ffffffff8ff0e0b7 R09: 1ffffffff1fe1c16
R10: dffffc0000000000 R11: fffffbfff1fe1c17 R12: ffffffff8e565cb8
R13: dffffc0000000000 R14: ffff88812103bd98 R15: 1ffff110242077b3
 __rcu_read_unlock+0x83/0xe0
 __free_frozen_pages+0x17b/0xd10
 __mmdrop+0xb5/0x750
 finish_task_switch+0x449/0x920
 __schedule+0x1546/0x5070
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock_irqrestore+0x74/0x80
 __rcu_read_unlock+0x83/0xe0
 copy_pmd_range+0x7593/0x7e80
 copy_page_range+0xbe8/0x11f0
 dup_mmap+0xf40/0x1d90
 copy_mm+0x13b/0x4b0
 copy_process+0x18b5/0x3cf0
 kernel_clone+0x248/0x8e0
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fedcc59acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fedcd3adfd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fedcc815fa0 RCX: 00007fedcc59acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000008d805000
RBP: 00007fedcc608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fedcc816038 R14: 00007fedcc815fa0 R15: 00007fff0e83ca78
 </TASK>
sched: DL replenish lagged too much
