rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=991/1/0x4000000000000000 softirq=136919/136920 fqs=2990 (t=10502 jiffies g=156725 q=960) rcu: rcu_preempt kthread starved for 4399 jiffies! g156725 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:28664 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4995 [inline] __schedule+0xa94/0x4910 kernel/sched/core.c:6304 schedule+0xd2/0x260 kernel/sched/core.c:6377 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1963 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2136 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:115 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:556 NMI backtrace for cpu 1 CPU: 1 PID: 30481 Comm: syz-executor.3 Not tainted 5.17.0-rc8-syzkaller-00061-g34e047aa16c0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:604 [inline] check_cpu_stall kernel/rcu/tree_stall.h:688 [inline] rcu_pending kernel/rcu/tree.c:3919 [inline] rcu_sched_clock_irq.cold+0x402/0x755 kernel/rcu/tree.c:2617 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:lock_acquire+0x209/0x510 kernel/locking/lockdep.c:5643 Code: 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 a8 00 00 00 <65> 48 2b 04 25 28 00 00 00 0f 85 a3 02 00 00 48 81 c4 b0 00 00 00 RSP: 0018:ffffc900040d6f08 EFLAGS: 00000282 RAX: 784ff661e82a0700 RBX: fffff5200081ade3 RCX: 000000000000b228 RDX: 1ffff1100f63f14b RSI: 0000000000000402 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8ffc6a27 R10: fffffbfff1ff8d44 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888044254698 R15: 0000000000000000 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:354 [inline] batadv_tt_local_purge_pending_clients+0x112/0x4d0 net/batman-adv/translation-table.c:3655 batadv_tt_local_resize_to_mtu+0x96/0x130 net/batman-adv/translation-table.c:3958 batadv_hardif_activate_interface.part.0.cold+0x65/0x1ba net/batman-adv/hard-interface.c:662 batadv_hardif_activate_interface net/batman-adv/hard-interface.c:753 [inline] batadv_hardif_enable_interface+0xa1c/0xb20 net/batman-adv/hard-interface.c:745 batadv_softif_slave_add+0x64/0x130 net/batman-adv/soft-interface.c:839 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2534 __rtnl_newlink+0x13b0/0x1760 net/core/rtnetlink.c:3500 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3531 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5596 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fa6cbf94049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa6ca8e8168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fa6cc0a7030 RCX: 00007fa6cbf94049 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006 RBP: 00007fa6cbfee08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd33d94dcf R14: 00007fa6ca8e8300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 24 08 and $0x8,%al 2: 00 74 01 fb add %dh,-0x5(%rcx,%rax,1) 6: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax d: fc ff df 10: 48 01 c3 add %rax,%rbx 13: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) 1a: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx) 21: 00 22: 48 8b 84 24 a8 00 00 mov 0xa8(%rsp),%rax 29: 00 * 2a: 65 48 2b 04 25 28 00 sub %gs:0x28,%rax <-- trapping instruction 31: 00 00 33: 0f 85 a3 02 00 00 jne 0x2dc 39: 48 81 c4 b0 00 00 00 add $0xb0,%rsp