rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4507/1:b..l P4523/1:b..l (detected by 0, t=10502 jiffies, g=10173, q=129 ncpus=2) task:modprobe state:R running task stack:24352 pid:4523 ppid:4490 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873 irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:__kasan_check_write+0x2/0x10 mm/kasan/shadow.c:37 Code: 0a 48 c7 c7 a3 a7 22 8c 48 89 de e8 e8 70 32 08 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 31 d2 e9 a3 ec ff ff 0f 1f 00 89 f6 <48> 8b 0c 24 ba 01 00 00 00 e9 90 ec ff ff 55 41 56 53 48 89 d3 89 RSP: 0018:ffffc90004c1f878 EFLAGS: 00000293 RAX: ffffffff89fdac25 RBX: 0000000000000003 RCX: ffff888056c81dc0 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff96e2f1c0 RBP: ffffc90004c1fa50 R08: ffff888056c81dc0 R09: 0000000000000003 R10: 0000000000000003 R11: 0000000000000000 R12: ffff88807e7f6f88 R13: ffff888074f9d480 R14: 0000000000000001 R15: 0000000000000300 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_inc include/linux/atomic/atomic-instrumented.h:190 [inline] mt_validate_nulls lib/maple_tree.c:7193 [inline] mt_validate+0x4426/0x4c90 lib/maple_tree.c:7244 validate_mm_mt+0xcd/0x420 mm/mmap.c:294 validate_mm+0xcc/0x2b0 mm/mmap.c:331 do_mmap+0xc7/0xf30 mm/mmap.c:1269 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1478 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff112f64242 RSP: 002b:00007ffc102b1cd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007ff112c90000 RCX: 00007ff112f64242 RDX: 0000000000000005 RSI: 0000000000008000 RDI: 00007ff112c90000 RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000003000 R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffc102b1d28 R13: 00007ff112f40b20 R14: 00007ffc102b2110 R15: 00000fff8205639e task:syz.2.46 state:R running task stack:24576 pid:4507 ppid:4264 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6730 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6754 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 __local_bh_enable_ip+0x13b/0x1b0 kernel/softirq.c:428 spin_unlock_bh include/linux/spinlock.h:396 [inline] __fib6_clean_all+0x239/0x370 net/ipv6/ip6_fib.c:2262 rt6_sync_down_dev net/ipv6/route.c:4944 [inline] rt6_disable_ip+0x120/0x7f0 net/ipv6/route.c:4949 addrconf_ifdown+0x162/0x1a10 net/ipv6/addrconf.c:3804 addrconf_notify+0x405/0xf40 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_mtu net/core/dev.c:2076 [inline] dev_set_mtu_ext+0x432/0x610 net/core/dev.c:8768 dev_set_mtu+0x41/0xc0 net/core/dev.c:8789 dev_ifsioc+0x490/0xe90 net/core/dev_ioctl.c:334 dev_ioctl+0x578/0xea0 net/core/dev_ioctl.c:588 sock_do_ioctl+0x222/0x2f0 net/socket.c:1218 sock_ioctl+0x4ed/0x6e0 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7efee4b8e929 RSP: 002b:00007efee5973038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007efee4db5fa0 RCX: 00007efee4b8e929 RDX: 0000200000002280 RSI: 0000000000008922 RDI: 0000000000000005 RBP: 00007efee4c10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007efee4db5fa0 R15: 00007ffee7b4c3b8 rcu: rcu_preempt kthread starved for 10572 jiffies! g10173 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:27840 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905 kthread+0x29d/0x330 kernel/kthread.c:376 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 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741