------------[ 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.2.2800/16601 Modules linked in: CPU: 0 UID: 0 PID: 16601 Comm: syz.2.2800 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:rcu_note_context_switch+0xcac/0xf40 kernel/rcu/tree_plugin.h:332 Code: 00 41 c6 45 00 00 48 8b 3d c1 d6 65 0e 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 4b 63 ff ff 48 8d 3d 24 b4 69 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:ffffc9000f7b6bf0 EFLAGS: 00010002 RAX: 0000000000000000 RBX: ffff88802896bc80 RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8c27a860 RDI: ffffffff90150910 RBP: dffffc0000000000 R08: ffffffff90117db7 R09: 1ffffffff2022fb6 R10: dffffc0000000000 R11: fffffbfff2022fb7 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880b863bd40 R15: ffff88802896c104 FS: 00007f12fc3a66c0(0000) GS:ffff888125466000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c361fae CR3: 0000000040b2e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000c DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __schedule+0x2ff/0x5340 kernel/sched/core.c:6791 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 netlink_broadcast_filtered+0xfa1/0x1020 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:4066 ip6_route_del+0x1047/0x1100 net/ipv6/route.c:4206 inet6_rtm_delroute+0x5d7/0x6d0 net/ipv6/route.c:5639 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 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: 0033:0x7f12fb59c629 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:00007f12fc3a6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f12fb816090 RCX: 00007f12fb59c629 RDX: 0000000000000000 RSI: 0000200000000280 RDI: 000000000000000a RBP: 00007f12fb632b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f12fb816128 R14: 00007f12fb816090 R15: 00007f12fb93fa48 ---------------- Code disassembly (best guess): 0: 00 41 c6 add %al,-0x3a(%rcx) 3: 45 00 00 add %r8b,(%r8) 6: 48 8b 3d c1 d6 65 0e mov 0xe65d6c1(%rip),%rdi # 0xe65d6ce 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 4b 63 ff ff jmp 0xffff636e 23: 48 8d 3d 24 b4 69 0e lea 0xe69b424(%rip),%rdi # 0xe69b44e * 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