rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=9224/1/0x4000000000000000 softirq=55781/55782 fqs=110
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1861236          0            0
rcu: 	cputime:    39426       7963            5   ==> 47430(ms)
rcu: 	(t=10505 jiffies g=69345 q=3951 ncpus=2)
CPU: 1 PID: 15618 Comm: syz.2.3300 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:218 [inline]
RIP: 0010:unwind_next_frame+0x251/0x2970 arch/x86/kernel/unwind_orc.c:494
Code: 20 ee b2 8f 4c 89 e8 48 c1 e8 03 48 bb 00 00 00 00 00 fc ff df 0f b6 04 18 84 c0 0f 85 de 21 00 00 45 8b 6d 00 44 89 f8 ff c0 <48> 8d 2c 85 20 ee b2 8f 48 89 e8 48 c1 e8 03 0f b6 04 18 84 c0 0f
RSP: 0018:ffffc900001f0578 EFLAGS: 00000202
RAX: 00000000000076ce RBX: dffffc0000000000 RCX: 0000000000000100
RDX: ffff88801d748000 RSI: 00000000000076cd RDI: 000000000009c000
RBP: 000000000009c000 R08: ffffc900001f0710 R09: 0000000000000008
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001f0648
R13: 0000000000018d8f R14: ffffc900001f067d R15: 00000000000076cd
FS:  00007f4e2ceb96c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555558afe9f8 CR3: 0000000063273000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 __kmem_cache_free+0xba/0x1e0 mm/slub.c:3843
 skb_kfree_head net/core/skbuff.c:946 [inline]
 skb_free_head net/core/skbuff.c:958 [inline]
 skb_release_data+0x5dc/0x7b0 net/core/skbuff.c:988
 skb_release_all net/core/skbuff.c:1054 [inline]
 __kfree_skb net/core/skbuff.c:1068 [inline]
 kfree_skb_reason+0x10e/0x170 net/core/skbuff.c:1104
 inet_frag_rbtree_purge net/ipv4/inet_fragment.c:282 [inline]
 inet_frag_destroy+0x179/0x290 net/ipv4/inet_fragment.c:306
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_release+0x117/0x8c0 kernel/locking/lockdep.c:5767
Code: 9a 04 00 00 65 4c 8b 35 47 03 9b 7e 49 8d 9e dc 0a 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 38 05 00 00 83 3b 00 <0f> 85 6e 04 00 00 4c 89 74 24 10 43 c6 44 2f 08 00 48 c7 84 24 a0
RSP: 0018:ffffc9000b5c7260 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88801d748adc RCX: c1183409013ba800
RDX: 0000000000000000 RSI: ffffffff8b1c9c00 RDI: ffffffff8b1c9bc0
RBP: ffffc9000b5c7368 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd
R10: dffffc0000000000 R11: fffffbfff1d16cce R12: ffffffff813ca58c
R13: dffffc0000000000 R14: ffff88801d748000 R15: 1ffff920016b8e58
 rcu_lock_release include/linux/rcupdate.h:344 [inline]
 rcu_read_unlock_sched include/linux/rcupdate.h:899 [inline]
 pfn_valid include/linux/mmzone.h:2021 [inline]
 __virt_addr_valid+0x439/0x540 arch/x86/mm/physaddr.c:65
 kasan_addr_to_slab+0xd/0xc0 mm/kasan/common.c:36
 __kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:477
 __call_rcu_common kernel/rcu/tree.c:2721 [inline]
 call_rcu+0x153/0x950 kernel/rcu/tree.c:2837
 context_switch kernel/sched/core.c:5384 [inline]
 __schedule+0x155b/0x45a0 kernel/sched/core.c:6700
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x111/0x120 kernel/locking/spinlock.c:194
 rcu_report_unblock_qs_rnp kernel/rcu/tree.c:1996 [inline]
 rcu_preempt_deferred_qs_irqrestore+0xa1c/0xce0 kernel/rcu/tree_plugin.h:560
 rcu_read_unlock_special+0x3d4/0x4d0 kernel/rcu/tree_plugin.h:762
 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:818 [inline]
 xa_load+0x2a8/0x2e0 lib/xarray.c:1465
 memcg_list_lru_allocated mm/list_lru.c:469 [inline]
 memcg_list_lru_alloc+0x13e/0xb10 mm/list_lru.c:483
 memcg_slab_pre_alloc_hook mm/slab.h:501 [inline]
 slab_pre_alloc_hook+0x2b2/0x310 mm/slab.h:719
 slab_alloc_node mm/slub.c:3477 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc_lru+0x4d/0x2d0 mm/slub.c:3526
 alloc_inode_sb include/linux/fs.h:2946 [inline]
 sock_alloc_inode+0x28/0xc0 net/socket.c:308
 alloc_inode fs/inode.c:261 [inline]
 new_inode_pseudo+0x63/0x1d0 fs/inode.c:1049
 sock_alloc net/socket.c:634 [inline]
 __sock_create+0x12d/0x940 net/socket.c:1534
 sock_create net/socket.c:1626 [inline]
 __sys_socketpair+0x1c1/0x550 net/socket.c:1777
 __do_sys_socketpair net/socket.c:1830 [inline]
 __se_sys_socketpair net/socket.c:1827 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1827
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4e2bf9ce59
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:00007f4e2ceb9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f4e2c215fa0 RCX: 00007f4e2bf9ce59
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007f4e2c032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000007c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e2c216038 R14: 00007f4e2c215fa0 R15: 00007ffef29e1c58
 </TASK>