------------[ cut here ]------------ Voluntary context switch within RCU read-side critical section! WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0xc58/0xef0 kernel/rcu/tree_plugin.h:332, CPU#1: syz.0.17/5882 Modules linked in: CPU: 1 UID: 0 PID: 5882 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:rcu_note_context_switch+0xc58/0xef0 kernel/rcu/tree_plugin.h:332 Code: 00 41 c6 45 00 00 48 8b 3d f5 18 ab 0e 48 81 c4 a8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 af 60 ff ff 48 8d 3d 88 34 af 0e <67> 48 0f b9 3a e9 6f f4 ff ff 90 0f 0b 90 45 84 e4 0f 84 3e f4 ff RSP: 0018:ffffc90003576d20 EFLAGS: 00010002 RAX: 0000000000000000 RBX: ffff8880310e0000 RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8c4bd260 RDI: ffffffff905b3400 RBP: dffffc0000000000 R08: ffffffff90576bf7 R09: 1ffffffff20aed7e R10: dffffc0000000000 R11: fffffbfff20aed7f R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880b873c180 R15: ffff8880310e04c4 FS: 0000555576de1500(0000) GS:ffff88812505a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd68b273780 CR3: 000000007ac72000 CR4: 00000000003526f0 Call Trace: __schedule+0x2e9/0x56c0 kernel/sched/core.c:7088 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7326 netlink_broadcast_filtered+0xe53/0xea0 net/netlink/af_netlink.c:1553 nlmsg_multicast_filtered include/net/netlink.h:1165 [inline] nlmsg_multicast include/net/netlink.h:1184 [inline] nlmsg_notify+0xe3/0x1a0 net/netlink/af_netlink.c:2599 __ip6_del_rt_siblings+0x5ed/0x7d0 net/ipv6/route.c:4080 ip6_route_del+0x104f/0x1100 net/ipv6/route.c:4220 inet6_rtm_delroute+0x5d7/0x6d0 net/ipv6/route.c:5657 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7076 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2684 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd68b39de59 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:00007ffc6c861a78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd68b625fa0 RCX: 00007fd68b39de59 RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000004 RBP: 00007fd68b433e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd68b625fac R14: 00007fd68b625fa0 R15: 00007fd68b625fa0 ---------------- Code disassembly (best guess): 0: 00 41 c6 add %al,-0x3a(%rcx) 3: 45 00 00 add %r8b,(%r8) 6: 48 8b 3d f5 18 ab 0e mov 0xeab18f5(%rip),%rdi # 0xeab1902 d: 48 81 c4 a8 00 00 00 add $0xa8,%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 af 60 ff ff jmp 0xffff60d2 23: 48 8d 3d 88 34 af 0e lea 0xeaf3488(%rip),%rdi # 0xeaf34b2 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 6f f4 ff ff jmp 0xfffff4a3 34: 90 nop 35: 0f 0b ud2 37: 90 nop 38: 45 84 e4 test %r12b,%r12b 3b: 0f .byte 0xf 3c: 84 3e test %bh,(%rsi) 3e: f4 hlt 3f: ff .byte 0xff