batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=b16/1/0x4000000000000002 softirq=98769/98769 fqs=0 rcu: (t=10500 jiffies g=113093 q=15764) rcu: rcu_preempt kthread starved for 10500 jiffies! g113093 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I29208 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1818 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 0 CPU: 0 PID: 21959 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1465 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:99 [inline] RIP: 0010:__local_bh_enable_ip+0x18d/0x270 kernel/softirq.c:196 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 dd 00 00 00 48 83 3d c8 5f b8 08 00 0f 84 8d 00 00 00 fb 66 0f 1f 44 00 00 <65> 8b 05 6c bc c8 7e 85 c0 74 7d 5b 5d 41 5c c3 80 3d f3 87 d5 09 RSP: 0018:ffff888045446e78 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3053 RBX: 0000000000000201 RCX: 1ffff11007fb15a2 RDX: dffffc0000000000 RSI: ffff88803fd8acf0 RDI: ffff88803fd8acc4 RBP: ffffffff87dbdb48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803fd8a440 R13: ffff8880a20a5018 R14: 0000000000000000 R15: dffffc0000000000 spin_unlock_bh include/linux/spinlock.h:374 [inline] batadv_tt_local_purge+0x278/0x370 net/batman-adv/translation-table.c:1456 batadv_tt_local_resize_to_mtu+0x8e/0x130 net/batman-adv/translation-table.c:4207 batadv_hardif_activate_interface.part.0.cold+0x88/0x226 net/batman-adv/hard-interface.c:664 batadv_hardif_activate_interface net/batman-adv/hard-interface.c:825 [inline] batadv_hardif_enable_interface+0xadf/0xba0 net/batman-adv/hard-interface.c:817 batadv_softif_slave_add+0x8a/0x100 net/batman-adv/soft-interface.c:898 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2321 rtnl_newlink+0x1279/0x15c0 net/core/rtnetlink.c:3170 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd71a8d50d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007fd718e26168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd71a9f5050 RCX: 00007fd71a8d50d9 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000009 RBP: 00007fd71a930ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda498d62f R14: 00007fd718e26300 R15: 0000000000022000 net_ratelimit: 5751 callbacks suppressed batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) rcu: INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-... } 10541 jiffies s: 757 root: 0x1/. batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) rcu: blocking rcu_node structures: batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) Task dump for CPU 0: batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) syz-executor.0 R running task 25264 21959 8128 0x8000000e batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) Call Trace: batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) rcu: INFO: rcu_sched detected stalls on CPUs/tasks: rcu: 0-....: (10543 ticks this GP) idle=b16/1/0x4000000000000000 softirq=98765/98769 fqs=5165 rcu: (detected by 1, t=10502 jiffies, g=3749, q=11) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 21959 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:__local_bh_enable_ip+0x83/0x270 kernel/softirq.c:169 Code: 8b 24 25 c0 df 01 00 49 8d bc 24 84 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 <83> c0 03 38 d0 7c 08 84 d2 0f 85 9e 01 00 00 41 8b 94 24 84 08 00 RSP: 0018:ffff888045446e78 EFLAGS: 00000202 RAX: 0000000000000004 RBX: 0000000000000201 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffff88803fd8acc4 RBP: ffffffff87dbdb48 R08: 0000000000000000 R09: ffffed1013cb58ef R10: ffff88809e5ac77b R11: 0000000000000000 R12: ffff88803fd8a440 R13: ffff8880a20a5418 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fd718e26700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f527af3f718 CR3: 00000000aa9bf000 CR4: 00000000003406f0 DR0: 0080ffff00000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: spin_unlock_bh include/linux/spinlock.h:374 [inline] batadv_tt_local_purge+0x278/0x370 net/batman-adv/translation-table.c:1456 batadv_tt_local_resize_to_mtu+0x8e/0x130 net/batman-adv/translation-table.c:4207 batadv_hardif_activate_interface.part.0.cold+0x88/0x226 net/batman-adv/hard-interface.c:664 batadv_hardif_activate_interface net/batman-adv/hard-interface.c:825 [inline] batadv_hardif_enable_interface+0xadf/0xba0 net/batman-adv/hard-interface.c:817 batadv_softif_slave_add+0x8a/0x100 net/batman-adv/soft-interface.c:898 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2321 rtnl_newlink+0x1279/0x15c0 net/core/rtnetlink.c:3170 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd71a8d50d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007fd718e26168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd71a9f5050 RCX: 00007fd71a8d50d9 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000009 RBP: 00007fd71a930ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda498d62f R14: 00007fd718e26300 R15: 0000000000022000 net_ratelimit: 5369 callbacks suppressed batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320) batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)