syzbot

ip6_tunnel: K xmit: Local address not yet configured!
ip6_tunnel: K xmit: Local address not yet configured!
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=795c/1/0x4000000000000000 softirq=80524/80525 fqs=0
rcu: 	(detected by 1, t=10506 jiffies, g=91017, q=324 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5612 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:advance_sched+0x673/0xd20 net/sched/sch_taprio.c:987
Code: ea 03 80 3c 02 00 0f 85 09 06 00 00 4d 89 af 50 01 00 00 48 8b 74 24 20 4c 89 fa 48 8b 7c 24 48 e8 d2 43 ff ff e8 4d 91 42 f8 <48> b8 00 00 00 00 00 fc ff df 48 8b 54 24 38 48 c1 ea 03 80 3c 02
RSP: 0018:ffffc90000007de8 EFLAGS: 00000046
RAX: 0000000080010003 RBX: 0000000000000000 RCX: ffffffff89c68fed
RDX: ffff88807e122540 RSI: ffffffff89c74b53 RDI: ffff88807e122540
RBP: ffff8880561e2800 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 18c2fcf81ae80806 R14: ffff888033632400 R15: ffff888033632400
FS:  0000555592213500(0000) GS:ffff888123de8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000003b030 CR3: 000000005cacb000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__nr_to_section+0xb5/0x100 include/linux/mmzone.h:2058
Code: c1 ea 03 80 3c 02 00 75 57 48 8b 6d 00 48 85 ed 74 2a e8 ee 76 83 ff 83 e3 7f e8 e6 76 83 ff 48 c1 e3 05 48 01 dd 5b 48 89 e8 <5d> 41 5c e9 93 4b 36 09 bd 01 00 00 00 e9 53 ff ff ff e8 c4 76 83
RSP: 0018:ffffc9000319f410 EFLAGS: 00000282
RAX: ffff88813fe74180 RBX: 0000000000064aa8 RCX: ffffffff8286654e
RDX: ffff88807e122540 RSI: ffffffff828665ba RDI: ffff88807e122540
RBP: ffff88813fe74180 R08: 0000000000000006 R09: 0000000000001000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
 __pfn_to_section include/linux/mmzone.h:2187 [inline]
 lookup_page_ext+0x46/0x100 mm/page_ext.c:255
 page_ext_iter_begin include/linux/page_ext.h:137 [inline]
 page_table_check_set+0x314/0x930 mm/page_table_check.c:113
 __page_table_check_ptes_set+0x27a/0x4e0 mm/page_table_check.c:212
 page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
 set_ptes include/linux/pgtable.h:447 [inline]
 __copy_present_ptes mm/memory.c:1118 [inline]
 copy_present_ptes mm/memory.c:1197 [inline]
 copy_pte_range mm/memory.c:1320 [inline]
 copy_pmd_range mm/memory.c:1408 [inline]
 copy_pud_range mm/memory.c:1445 [inline]
 copy_p4d_range mm/memory.c:1469 [inline]
 copy_page_range+0x2197/0x5b20 mm/memory.c:1555
 dup_mmap+0xd44/0x21b0 mm/mmap.c:1840
 dup_mm kernel/fork.c:1543 [inline]
 copy_mm kernel/fork.c:1595 [inline]
 copy_process+0x4588/0x8030 kernel/fork.c:2289
 kernel_clone+0x176/0x9d0 kernel/fork.c:2748
 __do_sys_clone+0xd9/0x120 kernel/fork.c:2889
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3dc07c68d2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffda604eae0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffda604eae0 RCX: 00007f3dc07c68d2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffda604ec6c R08: 0000000000000000 R09: 0000000000000001
R10: 00005555922137d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 000000000011bcc6 R15: 00007ffda604ecc0
 </TASK>
rcu: rcu_preempt kthread starved for 10506 jiffies! g91017 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:27928 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7326
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 20447 Comm: syz.1.4345 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:write_comp_data+0x40/0x90 kernel/kcov.c:246
Code: 59 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 c3 cc cc cc cc 8b 87 24 17 00 00 85 c0 74 f1 8b 87 f8 16 00 00 <83> f8 03 75 e6 48 8b 87 00 17 00 00 8b bf fc 16 00 00 48 8b 30 48
RSP: 0018:ffffc9000e5c79f8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff81fd46fd
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88807c70a540
RBP: ffff8880b8443680 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170886d1 R14: 0000000000000001 R15: ffff8880b853c880
FS:  00007f3ffebb26c0(0000) GS:ffff888123ee8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000036030 CR3: 000000003863f000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 csd_lock_wait kernel/smp.c:342 [inline]
 smp_call_function_many_cond+0x5ad/0x16c0 kernel/smp.c:892
 clock_was_set+0x61c/0x850 kernel/time/hrtimer.c:999
 do_adjtimex+0x302/0x370 kernel/time/timekeeping.c:3006
 do_clock_adjtime kernel/time/posix-timers.c:1169 [inline]
 __do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1181
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4000d9de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3ffebb2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f4001026270 RCX: 00007f4000d9de59
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007f4000e33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4001026308 R14: 00007f4001026270 R15: 00007ffeeba3c738
 </TASK>