syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P14310/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=77965, q=857007 ncpus=2)
task:syz.6.2336      state:R  running task     stack:24568 pid:14310 tgid:14309 ppid:6940   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190
 irqentry_exit+0x5e3/0x670 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x44/0x3b0 kernel/locking/lockdep.c:5879
Code: 8b 05 70 f0 e1 10 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 73 f0 e1 10 83 f8 08 0f 83 57 02 00 00 89 c0 48 0f a3 05 9c 04 e4 0d <73> 0d e8 f5 dd 08 00 84 c0 0f 84 95 02 00 00 83 3d b6 34 e4 0d 00
RSP: 0018:ffffc9001385e810 EFLAGS: 00000297
RAX: 0000000000000001 RBX: ffffffff9023ad01 RCX: 0000000080000001
RDX: ffffc9001385e901 RSI: ffffffff8173fdd5 RDI: ffffffff8df41aa0
RBP: dffffc0000000000 R08: ffffc9001385ecd0 R09: 0000000000000000
R10: ffffc9001385e998 R11: fffff5200270bd35 R12: ffffc9001385ece0
R13: ffffffff8173fdd5 R14: ffffffff8df41aa0 R15: ffffffff8173fdd5
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:897 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
 unwind_next_frame+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_node_noprof+0x43c/0x720 mm/slub.c:5315
 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586
 __alloc_skb+0x204/0x3a0 net/core/skbuff.c:690
 __pskb_copy_fclone+0xa8/0xfb0 net/core/skbuff.c:2201
 __pskb_copy include/linux/skbuff.h:1447 [inline]
 tipc_msg_reassemble+0x10b/0x3b0 net/tipc/msg.c:775
 tipc_mcast_xmit+0x1f0/0x1850 net/tipc/bcast.c:392
 tipc_send_group_bcast+0x79e/0xa70 net/tipc/socket.c:1130
 __tipc_sendmsg+0x2d7/0x2940 net/tipc/socket.c:1432
 tipc_sendmsg+0x55/0x70 net/tipc/socket.c:1399
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x52d/0x820 net/socket.c:2592
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
 __sys_sendmmsg+0x227/0x430 net/socket.c:2735
 __do_sys_sendmmsg net/socket.c:2762 [inline]
 __se_sys_sendmmsg net/socket.c:2759 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2759
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6722b8f749
RSP: 002b:00007f6723b08038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f6722de5fa0 RCX: 00007f6722b8f749
RDX: 0400000000000181 RSI: 00002000000030c0 RDI: 0000000000000005
RBP: 00007f6722c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 9200000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6722de6038 R14: 00007f6722de5fa0 R15: 00007f6722f0fa28
 </TASK>