rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P23075/1:b..l rcu: (detected by 1, t=10503 jiffies, g=172505, q=941657 ncpus=2) task:syz.0.4067 state:R running task stack:25152 pid:23075 tgid:23070 ppid:21897 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:kasan_check_range+0x4/0x2c0 mm/kasan/generic.c:199 Code: 48 89 df 48 c7 c6 cd 98 16 8e e8 07 4f f8 fe 90 0f 0b cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 <55> 41 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 ae 01 00 00 4c RSP: 0018:ffffc90004b7e970 EFLAGS: 00000246 RAX: ffffc90004b7f1e0 RBX: 0000000000000010 RCX: ffffffff81768c9e RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90004b7eab8 RBP: 0000000000000000 R08: 0000000000000003 R09: ffffffff8e75e520 R10: ffffc90004b7eab8 R11: ffffffff81b0c260 R12: ffffc90004b7eab8 R13: 1ffff9200096fd4f R14: ffffc90004b7eab8 R15: ffffc90004b7eab0 __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 unwind_next_frame+0xeae/0x23c0 arch/x86/kernel/unwind_orc.c:607 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5573 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4918 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6763 sock_alloc_send_pskb+0x878/0x990 net/core/sock.c:2995 sock_alloc_send_skb include/net/sock.h:1894 [inline] __ip_append_data+0x2bc5/0x3f30 net/ipv4/ip_output.c:1127 ip_make_skb+0x22e/0x450 net/ipv4/ip_output.c:1574 udp_sendmsg+0x19fb/0x22f0 net/ipv4/udp.c:1480 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x80a/0x9f0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmmsg+0x27c/0x4e0 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f32bb39c799 RSP: 002b:00007f32bc2a1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f32bb616270 RCX: 00007f32bb39c799 RDX: 0000000000000300 RSI: 0000200000004d00 RDI: 0000000000000007 RBP: 00007f32bb432c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000f00 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f32bb616308 R14: 00007f32bb616270 R15: 00007f32bb73fa48