ip6_tunnel: ip6gretap1 xmit: Local address not yet configured! rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=56c4/1/0x4000000000000000 softirq=111437/111438 fqs=32 rcu: (detected by 0, t=10502 jiffies, g=128681, q=637 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 22681 Comm: syz.8.5727 Not tainted 6.16.0-next-20250731-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__this_cpu_preempt_check+0x0/0x20 lib/smp_processor_id.c:63 Code: b6 da bb f5 eb a7 e8 8f e4 ff ff 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 89 fe 48 c7 c7 00 41 e3 8b e9 bd fe ff ff cc cc cc RSP: 0018:ffffc90000a08c20 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 3168275062bc4e00 RDX: ffff88802d6f9e00 RSI: ffff8880529bb300 RDI: ffffffff8db7a779 RBP: 00000000ffffffff R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200014117c R12: 0000000000000046 R13: ffff88802d6f9e00 R14: ffff8880529bb300 R15: 0000000000000002 FS: 00007f67fd69e6c0(0000) GS:ffff888125d43000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d01aff8 CR3: 0000000042926000 CR4: 00000000003526f0 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lock_is_held_type+0xfe/0x190 kernel/locking/lockdep.c:5941 lock_is_held include/linux/lockdep.h:249 [inline] advance_sched+0x160/0xc90 net/sched/sch_taprio.c:927 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ca ac 23 f6 48 89 df e8 22 44 24 f6 e8 1d 96 4d f6 fb bf 01 00 00 00 82 3c 16 f6 65 8b 05 fb 0f 24 07 85 c0 74 07 5b c3 cc cc cc cc RSP: 0018:ffffc900038ce918 EFLAGS: 00000286 RAX: 3168275062bc4e00 RBX: ffff888076998a30 RCX: 3168275062bc4e00 RDX: 0000000000000006 RSI: ffffffff8d98c137 RDI: 0000000000000001 RBP: ffff888076998a28 R08: ffffffff8fa21837 R09: 1ffffffff1f44306 R10: dffffc0000000000 R11: fffffbfff1f44307 R12: 1ffffd4000408e38 R13: ffffea00020471c8 R14: 0000000000020000 R15: 0000000000000000 spin_unlock_irq include/linux/spinlock.h:401 [inline] __remove_mapping+0x86a/0xad0 mm/vmscan.c:814 shrink_folio_list+0x28af/0x4cd0 mm/vmscan.c:1552 reclaim_folio_list+0xeb/0x500 mm/vmscan.c:2232 reclaim_pages+0x49a/0x5b0 mm/vmscan.c:2269 madvise_cold_or_pageout_pte_range+0x1974/0x1d00 mm/madvise.c:565 walk_pmd_range mm/pagewalk.c:130 [inline] walk_pud_range mm/pagewalk.c:224 [inline] walk_p4d_range mm/pagewalk.c:262 [inline] walk_pgd_range+0xfe6/0x1d40 mm/pagewalk.c:303 __walk_page_range+0x14c/0x710 mm/pagewalk.c:410 walk_page_range_vma+0x393/0x440 mm/pagewalk.c:705 madvise_pageout_page_range mm/madvise.c:624 [inline] madvise_pageout mm/madvise.c:649 [inline] madvise_vma_behavior+0x31c2/0x3af0 mm/madvise.c:1352 madvise_walk_vmas+0x51c/0xa30 mm/madvise.c:1669 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1885 do_madvise+0x1bc/0x270 mm/madvise.c:1978 __do_sys_madvise mm/madvise.c:1987 [inline] __se_sys_madvise mm/madvise.c:1985 [inline] __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1985 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f67fc78eb69 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f67fd69e038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f67fc9b5fa0 RCX: 00007f67fc78eb69 RDX: 0000000000000015 RSI: 7fffffffffffffff RDI: 0000200000000000 RBP: 00007f67fc811df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f67fc9b5fa0 R15: 00007ffd28d4e868 rcu: rcu_preempt kthread starved for 10437 jiffies! g128681 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:26792 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x165/0x360 kernel/sched/core.c:7058 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 22704 Comm: syz.3.5736 Not tainted 6.16.0-next-20250731-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b6 62 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 5e 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 45 5e RSP: 0018:ffffc9000c6178e0 EFLAGS: 00000246 RAX: ffffffff81b454fb RBX: 1ffff110170e7f59 RCX: 0000000000080000 RDX: ffffc9000cafe000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000c617a48 R08: ffffffff8fa21837 R09: 1ffffffff1f44306 R10: dffffc0000000000 R11: fffffbfff1f44307 R12: ffff8880b873fac8 R13: dffffc0000000000 R14: ffff8880b863b180 R15: 0000000000000001 FS: 00007fe7164596c0(0000) GS:ffff888125c43000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6952ce56c0 CR3: 000000004b4ec000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044 invalidate_bdev+0x71/0xa0 block/bdev.c:100 btrfs_get_bdev_and_sb+0x114/0x340 fs/btrfs/volumes.c:497 btrfs_open_one_device fs/btrfs/volumes.c:662 [inline] open_fs_devices+0x1d6/0x1430 fs/btrfs/volumes.c:1245 btrfs_get_tree_super fs/btrfs/super.c:1922 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2074 [inline] btrfs_get_tree+0xcab/0x1820 fs/btrfs/super.c:2108 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4321 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe71559030a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe716458e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe716458ef0 RCX: 00007fe71559030a RDX: 00002000000055c0 RSI: 0000200000000200 RDI: 00007fe716458eb0 RBP: 00002000000055c0 R08: 00007fe716458ef0 R09: 000000000300000a R10: 000000000300000a R11: 0000000000000246 R12: 0000200000000200 R13: 00007fe716458eb0 R14: 00000000000055a3 R15: 0000200000000080