ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=16e4/1/0x4000000000000000 softirq=82259/82260 fqs=3
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11226/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=74929, q=198 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14312 Comm: syz.0.2432 Not tainted 6.16.0-rc3-syzkaller-00042-g78f4e737a53e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__kasan_check_read+0xa/0x20 mm/kasan/shadow.c:31
Code: 31 ed eb cf cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 89 f6 48 8b 0c 24 <31> d2 e9 ef e4 ff ff 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc90000a08d10 EFLAGS: 00000046
RAX: ffffffff81ae9354 RBX: 0000000000000000 RCX: ffffffff81ae936c
RDX: 0000000000010000 RSI: 0000000000000008 RDI: ffffffff8f9fe1f0
RBP: ffffc90000a08e90 R08: ffffffff99caacb3 R09: 1ffffffff3395596
R10: dffffc0000000000 R11: fffffbfff3395597 R12: ffff88806f15e340
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b8727cc0
FS:  0000000000000000(0000) GS:ffff888125d83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f611ff8 CR3: 0000000050354000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:638 [inline]
 cpu_online include/linux/cpumask.h:1197 [inline]
 trace_hrtimer_cancel include/trace/events/timer.h:317 [inline]
 debug_deactivate+0x5c/0x200 kernel/time/hrtimer.c:491
 __run_hrtimer kernel/time/hrtimer.c:1729 [inline]
 __hrtimer_run_queues+0x2b0/0xc60 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+0x10b/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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:find_stack lib/stackdepot.c:553 [inline]
RIP: 0010:stack_depot_save_flags+0x1aa/0x900 lib/stackdepot.c:619
Code: 00 31 f6 4c 89 54 24 18 e8 33 f6 ca ff 4c 8b 54 24 18 8b 74 24 04 85 db 75 62 4d 8b 24 24 4d 39 fc 74 56 41 39 6c 24 10 75 f0 <45> 39 54 24 14 75 e9 31 c0 49 8b 0c c6 49 3b 4c c4 20 75 dc 48 ff
RSP: 0018:ffffc90004616f28 EFLAGS: 00000246
RAX: ffff88823ae00000 RBX: 0000000000002000 RCX: 0000000000b52f40
RDX: 000000002c4ddff5 RSI: 0000000000000001 RDI: 000000003e6eb66e
RBP: 0000000008eb52f4 R08: 00000000c9350199 R09: 0000000067051705
R10: 000000000000000f R11: ffffffff81ace5b0 R12: ffff8880569b4690
R13: 000000000000000f R14: ffffc90004616fe0 R15: ffff88823b952f40
 save_stack+0x105/0x1f0 mm/page_owner.c:157
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1248 [inline]
 free_unref_folios+0xcd2/0x1570 mm/page_alloc.c:2763
 folios_put_refs+0x559/0x640 mm/swap.c:992
 free_pages_and_swap_cache+0x4be/0x520 mm/swap_state.c:267
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404
 zap_pte_range mm/memory.c:1774 [inline]
 zap_pmd_range mm/memory.c:1827 [inline]
 zap_pud_range mm/memory.c:1856 [inline]
 zap_p4d_range mm/memory.c:1877 [inline]
 unmap_page_range+0x38fd/0x41c0 mm/memory.c:1898
 unmap_single_vma mm/memory.c:1941 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:1985
 exit_mmap+0x248/0xb50 mm/mmap.c:1284
 __mmput+0x118/0x420 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x648/0x22e0 kernel/exit.c:952
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
 __do_sys_exit_group kernel/exit.c:1116 [inline]
 __se_sys_exit_group kernel/exit.c:1114 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1114
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f9eafb8e929
Code: Unable to access opcode bytes at 0x7f9eafb8e8ff.
RSP: 002b:00007ffc04f6a0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9eafb8e929
RDX: 00007f9eae9f9000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc04f6a12c R08: 0000001404f6a1bf R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000235
R13: 00000000000927c0 R14: 00000000000c677d R15: 00007ffc04f6a180
 </TASK>
task:kworker/u8:5    state:R  running task     stack:19896 pid:11226 tgid:11226 ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x31/0x90 kernel/kcov.c:314
Code: 24 65 48 8b 14 25 08 d0 99 92 65 8b 0d b8 7f d9 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 3c 16 00 00 00 74 52 <8b> 8a 18 16 00 00 83 f9 03 75 47 48 8b 8a 20 16 00 00 44 8b 8a 1c
RSP: 0018:ffffc90003767a18 EFLAGS: 00000246
RAX: ffffffff8b2d5c43 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8880356b8000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88807dc2cf20 R08: 0000000000000000 R09: ffffffff8b2d5c12
R10: dffffc0000000000 R11: ffffffff8b2d5b40 R12: dffffc0000000000
R13: ffffffff8b2d5c12 R14: ffff888031384d80 R15: 00000000000001e4
 rcu_read_lock include/linux/rcupdate.h:842 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0x103/0x610 net/batman-adv/network-coding.c:719
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g74929 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:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-rc3-syzkaller-00042-g78f4e737a53e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 95 28 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8de07d80 EFLAGS: 000002c6
RAX: fc57630822d69d00 RBX: ffffffff81974c68 RCX: fc57630822d69d00
RDX: 0000000000000001 RSI: ffffffff8d96ea60 RDI: ffffffff8be1b9c0
RBP: ffffffff8de07ea8 R08: ffff8880b8632f5b R09: 1ffff110170c65eb
R10: dffffc0000000000 R11: ffffed10170c65ec R12: ffffffff8f9fe1f0
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1bd2a50
FS:  0000000000000000(0000) GS:ffff888125c83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f717ff8 CR3: 0000000033272000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:749
 default_idle_call+0x74/0xb0 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:185 [inline]
 do_idle+0x1e8/0x510 kernel/sched/idle.c:325
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:423
 rest_init+0x2de/0x300 init/main.c:745
 start_kernel+0x47d/0x500 init/main.c:1102
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307
 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:288
 common_startup_64+0x13e/0x147
 </TASK>
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!
ip6_tunnel: ip6gretap0: Local routing loop detected!