clocksource: Long readout interval, skipping watchdog check: cs_nsec: 95706858951 wd_nsec: 95706860941
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (9842 ticks this GP) idle=3ccc/1/0x4000000000000000 softirq=186743/186744 fqs=4131
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1019459          4            0
rcu: 	cputime:    29473      23016           46   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=167909 q=4752 ncpus=2)
CPU: 0 UID: 0 PID: 9203 Comm: syz.6.9560 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:rcu_is_watching+0x5a/0xb0
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 6c 37 85 00 48 c7 c3 58 09 1d 93 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 34 8b 03 65 ff 0d 29 1e 71 11 74 11 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc900000075d8 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff888121033958 RCX: 0000000000000102
RDX: ffffc90000007701 RSI: ffffffff8c27b3e0 RDI: ffffffff8c27b3a0
RBP: dffffc0000000000 R08: ffffc90000007a58 R09: 0000000000000000
R10: ffffc90000007718 R11: fffff52000000ee5 R12: ffffc90000007a68
R13: ffffc90000000000 R14: ffffffff8e1ad790 R15: dffffc0000000000
FS:  00007f0527a706c0(0000) GS:ffff88818de63000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f88c3b1eff8 CR3: 00000001b7f36000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x1a66/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x384/0x690
 __alloc_skb+0x1d0/0x7d0
 ndisc_alloc_skb+0x9f/0x480
 ndisc_send_rs+0x2b5/0x630
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 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:finish_task_switch+0x245/0x920
Code: 00 00 48 85 db 0f 85 e8 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 85 99 1b 0a e8 b0 8e 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 70 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90004f078d8 EFLAGS: 00000206
RAX: 00000000000001c9 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8def4b7d RDI: ffffffff8c27b400
RBP: ffffc90004f07930 R08: ffffffff90118bb7 R09: 1ffffffff2023176
R10: dffffc0000000000 R11: fffffbfff2023177 R12: ffff8881a5558000
R13: dffffc0000000000 R14: ffff888020c19d40 R15: ffff88812103b918
 __schedule+0x15e5/0x52d0
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock_irqrestore+0x74/0x80
 __refill_objects_node+0x211/0x5c0
 refill_objects+0x5e/0x3c0
 __pcs_replace_empty_main+0x2f9/0x5e0
 kmem_cache_alloc_lru_noprof+0x37c/0x640
 sock_alloc_inode+0x28/0xc0
 alloc_inode+0x6a/0x1b0
 __sock_create+0x12d/0x9d0
 __sys_socket+0xd6/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0526b9c799
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:00007f0527a70028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f0526e15fa0 RCX: 00007f0526b9c799
RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007f0526c32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0526e16038 R14: 00007f0526e15fa0 R15: 00007ffe3646ce18
 </TASK>
