------------[ cut here ]------------ Voluntary context switch within RCU read-side critical section! WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0xcac/0xf40 kernel/rcu/tree_plugin.h:332, CPU#0: syz.1.2818/15659 Modules linked in: CPU: 0 UID: 0 PID: 15659 Comm: syz.1.2818 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:rcu_note_context_switch+0xcac/0xf40 kernel/rcu/tree_plugin.h:332 Code: 00 41 c6 45 00 00 48 8b 3d 71 6b 87 0e 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 8b 60 ff ff 48 8d 3d 24 4f 8b 0e <67> 48 0f b9 3a e9 1b f4 ff ff 90 0f 0b 90 45 84 e4 0f 84 ea f3 ff RSP: 0018:ffffc90003aa6cd0 EFLAGS: 00010002 RAX: 0000000000000000 RBX: ffff888032728000 RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8c289440 RDI: ffffffff9036e520 RBP: dffffc0000000000 R08: ffffffff903353f7 R09: 1ffffffff2066a7e R10: dffffc0000000000 R11: fffffbfff2066a7f R12: 0000000000000000 R13: ffff888032728000 R14: ffff8880b863be80 R15: ffff8880327284c4 FS: 00007fd8c9df66c0(0000) GS:ffff88812521e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000060000 CR3: 0000000050dda000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000001000 DR2: 0000000000000000 DR3: 0000000000000400 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __schedule+0x2e6/0x5680 kernel/sched/core.c:7043 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0x164/0x360 kernel/sched/core.c:7282 netlink_broadcast_filtered+0xe61/0xeb0 net/netlink/af_netlink.c:1547 nlmsg_multicast_filtered include/net/netlink.h:1165 [inline] nlmsg_multicast include/net/netlink.h:1184 [inline] nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2593 __ip6_del_rt_siblings+0x5fc/0x7d0 net/ipv6/route.c:4071 ip6_route_del+0x1047/0x1100 net/ipv6/route.c:4211 inet6_rtm_delroute+0x5d7/0x6d0 net/ipv6/route.c:5644 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6994 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x75c/0x8e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x972/0x9f0 net/socket.c:2698 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 __sys_sendmsg net/socket.c:2784 [inline] __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd8cbb9c819 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:00007fd8c9df6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd8cbe16180 RCX: 00007fd8cbb9c819 RDX: 0000000000000000 RSI: 00002000000004c0 RDI: 000000000000000d RBP: 00007fd8cbc32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd8cbe16218 R14: 00007fd8cbe16180 R15: 00007fd8cbf3fa48 ---------------- Code disassembly (best guess): 0: 00 41 c6 add %al,-0x3a(%rcx) 3: 45 00 00 add %r8b,(%r8) 6: 48 8b 3d 71 6b 87 0e mov 0xe876b71(%rip),%rdi # 0xe876b7e d: 48 81 c4 b8 00 00 00 add $0xb8,%rsp 14: 5b pop %rbx 15: 41 5c pop %r12 17: 41 5d pop %r13 19: 41 5e pop %r14 1b: 41 5f pop %r15 1d: 5d pop %rbp 1e: e9 8b 60 ff ff jmp 0xffff60ae 23: 48 8d 3d 24 4f 8b 0e lea 0xe8b4f24(%rip),%rdi # 0xe8b4f4e * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 1b f4 ff ff jmp 0xfffff44f 34: 90 nop 35: 0f 0b ud2 37: 90 nop 38: 45 84 e4 test %r12b,%r12b 3b: 0f .byte 0xf 3c: 84 ea test %ch,%dl 3e: f3 repz 3f: ff .byte 0xff