rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6317/2:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=15017, q=370 ncpus=2)
task:syz.0.151       state:R  running task     stack:24456 pid:6317  ppid:5774   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6700
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:694
RIP: 0010:find_rr_leaf net/ipv6/route.c:894 [inline]
RIP: 0010:rt6_select net/ipv6/route.c:938 [inline]
RIP: 0010:fib6_table_lookup+0x3cb/0xae0 net/ipv6/route.c:2235
Code: 00 44 8b 7c 24 44 45 89 f9 48 8d 84 24 00 01 00 00 50 48 8d 84 24 18 01 00 00 50 48 8b 5c 24 40 53 e8 09 c0 01 00 48 83 c4 18 <48> 8b 7c 24 10 4c 89 ac 24 a8 00 00 00 4c 89 ee 44 89 64 24 20 44
RSP: 0018:ffffc9000f7bf0c0 EFLAGS: 00000296
RAX: ed016e5fb9beef00 RBX: 0000000000000003 RCX: 0000000000080000
RDX: ffffc9000d71c000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000f7bf230 R08: ffffc9000f7bf1c0 R09: ffffc9000f7bf1d0
R10: ffffc9000f7bf020 R11: fffff52001ef7e06 R12: 0000000000000000
R13: ffff88805c9a8400 R14: ffffc9000f7bf2b0 R15: 0000000000000005
 ip6_pol_route+0x239/0x1230 net/ipv6/route.c:2271
 pol_lookup_func include/net/ip6_fib.h:641 [inline]
 fib6_rule_lookup+0x226/0x580 net/ipv6/fib6_rules.c:116
 ip6_route_output_flags_noref net/ipv6/route.c:2679 [inline]
 ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2691
 ip6_dst_lookup_tail+0x281/0x1660 net/ipv6/ip6_output.c:1161
 ip6_dst_lookup_flow+0x48/0xe0 net/ipv6/ip6_output.c:1264
 rawv6_sendmsg+0xd53/0x1740 net/ipv6/raw.c:892
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x61b/0x980 net/socket.c:2595
 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649
 __sys_sendmmsg+0x2ca/0x510 net/socket.c:2735
 __do_sys_sendmmsg net/socket.c:2764 [inline]
 __se_sys_sendmmsg net/socket.c:2761 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2761
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f995639ce59
RSP: 002b:00007f99545f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f9956616090 RCX: 00007f995639ce59
RDX: 0400000000000174 RSI: 0000200000008380 RDI: 0000000000000005
RBP: 00007f9956432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000004008890 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9956616128 R14: 00007f9956616090 R15: 00007ffe8817b2c8
 </TASK>
rcu: rcu_preempt kthread starved for 10541 jiffies! g15017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:27848 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: dc 23 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 43 67 44 00 fb f4 <c3> 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2c 89 cb 80 f9
RSP: 0018:ffffffff8ce07d80 EFLAGS: 000002c6
RAX: 36105f3569be7600 RBX: ffffffff81628c14 RCX: 36105f3569be7600
RDX: 0000000000000001 RSI: ffffffff8acacb60 RDI: ffffffff8b1c7be0
RBP: ffffffff8ce07eb8 R08: ffff8880b8e36bab R09: 1ffff110171c6d75
R10: dffffc0000000000 R11: ffffed10171c6d76 R12: 1ffffffff19c0fbc
R13: dffffc0000000000 R14: 1ffffffff19d2688 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde25eed011 CR3: 00000000776f1000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:753
 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:178 [inline]
 do_idle+0x334/0x5c0 kernel/sched/idle.c:302
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
 rest_init+0x2e2/0x300 init/main.c:744
 arch_call_rest_init+0xe/0x10 init/main.c:840
 start_kernel+0x459/0x4e0 init/main.c:1085
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
 x86_64_start_kernel+0x60/0x60 arch/x86/kernel/head64.c:536
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>