rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10493 ticks this GP) idle=957/1/0x4000000000000000 softirq=39457/39457 fqs=0 (t=10500 jiffies g=36373 q=4602) rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g36373 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=22947 rcu: rcu_preempt kthread starved for 10500 jiffies! g36373 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:29208 pid: 16 ppid: 2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5073 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6382 schedule+0xd2/0x1f0 kernel/sched/core.c:6454 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1971 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2144 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 </TASK> rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 0 CPU: 0 PID: 15193 Comm: syz-executor.4 Tainted: G W 5.17.0-syzkaller-12882-g1930a6e739c4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __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_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:490 print_cpu_stall kernel/rcu/tree_stall.h:634 [inline] check_cpu_stall kernel/rcu/tree_stall.h:723 [inline] rcu_pending kernel/rcu/tree.c:3923 [inline] rcu_sched_clock_irq.cold+0x57/0x8d6 kernel/rcu/tree.c:2625 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1473 __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 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:108 [inline] RIP: 0010:cpumask_check include/linux/cpumask.h:115 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:379 [inline] RIP: 0010:cpu_online include/linux/cpumask.h:921 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:lock_acquire+0x8f/0x510 kernel/locking/lockdep.c:5612 Code: 00 00 00 f3 c7 40 0c f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 a8 00 00 00 31 c0 0f 1f 44 00 00 65 8b 15 31 b3 a4 7e <83> fa 07 0f 87 dc 03 00 00 89 d2 be 08 00 00 00 48 89 d0 48 89 54 RSP: 0018:ffffc90014f6eef0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff920029edde0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880282d75d8 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff88fb4f71 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880282d75d8 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+0x114/0x370 net/batman-adv/translation-table.c:1355 batadv_tt_local_resize_to_mtu+0x8e/0x130 net/batman-adv/translation-table.c:3957 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+0xaba/0xac0 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+0x13b3/0x1760 net/core/rtnetlink.c:3500 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3531 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5990 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e2/0x800 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+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fec8ee89049 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:00007fec90025168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fec8ef9c100 RCX: 00007fec8ee89049 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006 RBP: 00007fec8eee308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe34d5599f R14: 00007fec90025300 R15: 0000000000022000 </TASK> NMI backtrace for cpu 0 CPU: 0 PID: 15193 Comm: syz-executor.4 Tainted: G W 5.17.0-syzkaller-12882-g1930a6e739c4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __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+0x262/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:639 [inline] check_cpu_stall kernel/rcu/tree_stall.h:723 [inline] rcu_pending kernel/rcu/tree.c:3923 [inline] rcu_sched_clock_irq.cold+0xa1/0x8d6 kernel/rcu/tree.c:2625 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1473 __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 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:108 [inline] RIP: 0010:cpumask_check include/linux/cpumask.h:115 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:379 [inline] RIP: 0010:cpu_online include/linux/cpumask.h:921 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:lock_acquire+0x8f/0x510 kernel/locking/lockdep.c:5612 Code: 00 00 00 f3 c7 40 0c f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 a8 00 00 00 31 c0 0f 1f 44 00 00 65 8b 15 31 b3 a4 7e <83> fa 07 0f 87 dc 03 00 00 89 d2 be 08 00 00 00 48 89 d0 48 89 54 RSP: 0018:ffffc90014f6eef0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff920029edde0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880282d75d8 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff88fb4f71 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880282d75d8 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+0x114/0x370 net/batman-adv/translation-table.c:1355 batadv_tt_local_resize_to_mtu+0x8e/0x130 net/batman-adv/translation-table.c:3957 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+0xaba/0xac0 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+0x13b3/0x1760 net/core/rtnetlink.c:3500 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3531 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5990 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e2/0x800 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+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fec8ee89049 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:00007fec90025168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fec8ef9c100 RCX: 00007fec8ee89049 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006 RBP: 00007fec8eee308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe34d5599f R14: 00007fec90025300 R15: 0000000000022000 </TASK> ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 f3 add %dh,%bl 4: c7 40 0c f3 f3 f3 f3 movl $0xf3f3f3f3,0xc(%rax) b: 65 48 8b 04 25 28 00 mov %gs:0x28,%rax 12: 00 00 14: 48 89 84 24 a8 00 00 mov %rax,0xa8(%rsp) 1b: 00 1c: 31 c0 xor %eax,%eax 1e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 23: 65 8b 15 31 b3 a4 7e mov %gs:0x7ea4b331(%rip),%edx # 0x7ea4b35b * 2a: 83 fa 07 cmp $0x7,%edx <-- trapping instruction 2d: 0f 87 dc 03 00 00 ja 0x40f 33: 89 d2 mov %edx,%edx 35: be 08 00 00 00 mov $0x8,%esi 3a: 48 89 d0 mov %rdx,%rax 3d: 48 rex.W 3e: 89 .byte 0x89 3f: 54 push %rsp