rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=7174/1/0x4000000000000000 softirq=64884/64884 fqs=42
rcu: 	(detected by 0, t=10506 jiffies, g=69737, q=284 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14256 Comm: syz.4.1856 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:lock_is_held_type+0x2f/0x140 kernel/locking/lockdep.c:5925
Code: 0d 7a a9 69 05 b8 ff ff ff ff 85 c9 0f 84 ed 00 00 00 65 8b 15 d2 d5 aa 08 85 d2 0f 85 de 00 00 00 41 57 41 56 41 55 41 54 55 <53> 48 83 ec 08 65 48 8b 2d fc 8e aa 08 8b 95 9c 0b 00 00 85 d2 0f
RSP: 0018:ffffc90000a08e20 EFLAGS: 00000046
RAX: 00000000ffffffff RBX: ffff88807abe9300 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8880b8528418
RBP: ffff8880b8528640 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880b8528400 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f2fa79e26c0(0000) GS:ffff888123eec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 00000000359bf000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:249 [inline]
 __remove_hrtimer+0x374/0x440 kernel/time/hrtimer.c:1145
 __run_hrtimer kernel/time/hrtimer.c:2012 [inline]
 __hrtimer_run_queues+0x352/0x9c0 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:__rcu_read_unlock+0xad/0x5e0 kernel/rcu/tree_plugin.h:441
Code: c8 04 00 00 85 c0 75 51 48 8d bb c4 04 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 8b 01 00 00 8b 83 c4 04 00 00 3d
RSP: 0018:ffffc90004407908 EFLAGS: 00000202
RAX: 0000000000000004 RBX: ffff88803783a540 RCX: ffffc90004407904
RDX: 0000000000000000 RSI: ffffffff8e17cd3b RDI: ffff88803783aa04
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000005
R13: ffffc90004407a78 R14: dffffc0000000000 R15: ffff88801bc62000
 rcu_read_unlock include/linux/rcupdate.h:873 [inline]
 atomic_notifier_call_chain+0xa8/0x1c0 kernel/notifier.c:224
 do_con_write+0x487/0x4a30 drivers/tty/vt/vt.c:3319
 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3661
 process_output_block drivers/tty/n_tty.c:557 [inline]
 n_tty_write+0x431/0x1160 drivers/tty/n_tty.c:2366
 iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
 file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 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: 0033:0x7f2fa6b9de59
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:00007f2fa79e2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2fa6e26180 RCX: 00007f2fa6b9de59
RDX: 0000000000001006 RSI: 0000200000002080 RDI: 0000000000000006
RBP: 00007f2fa6c33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2fa6e26218 R14: 00007f2fa6e26180 R15: 00007ffd08165898
 </TASK>
rcu: rcu_preempt kthread starved for 10295 jiffies! g69737 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:28984 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: 0 UID: 0 PID: 5614 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x593/0x16c0 kernel/smp.c:892
Code: 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 a9 95 0c 00 f3 90 41 0f b6 45 00 41 38 c4 7c 08 <84> c0 0f 85 2c 0f 00 00 8b 45 08 31 ff 83 e0 01 41 89 c6 89 c6 e8
RSP: 0000:ffffc90003fdf888 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fd3abd
RDX: ffff88807bd98000 RSI: ffffffff81fd3a97 RDI: ffff88807bd98000
RBP: ffff8880b8541240 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170a8249 R14: 0000000000000001 R15: ffff8880b843c880
FS:  0000555572495500(0000) GS:ffff888123dec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555724b0a48 CR3: 000000005b8ab000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x45f/0x16f0 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:345 [inline]
 ptep_clear_flush+0x148/0x170 mm/pgtable-generic.c:104
 wp_page_copy mm/memory.c:3941 [inline]
 do_wp_page+0x12a4/0x4350 mm/memory.c:4336
 handle_pte_fault mm/memory.c:6395 [inline]
 __handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6517
 handle_mm_fault+0x37b/0xa30 mm/memory.c:6686
 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f60ec3629e0
Code: e4 28 00 48 8d 0c 1e 49 39 d0 49 89 48 60 0f 95 c2 48 29 d8 0f b6 d2 48 83 c8 01 48 c1 e2 02 48 09 da 48 83 ca 01 48 89 56 08 <48> 89 41 08 48 8d 4e 10 eb b0 48 8d 0d a7 da 0c 00 ba 9e 10 00 00
RSP: 002b:00007ffd0c3bd680 EFLAGS: 00010206
RAX: 00000000000185c1 RBX: 0000000000008040 RCX: 00005555724b0a40
RDX: 0000000000008041 RSI: 00005555724a8a00 RDI: 0000000000000004
RBP: 0000000000000802 R08: 00007f60ec5f0e20 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008030
R13: 0000000000000000 R14: 00007f60ec5f0e80 R15: 0000000000000000
 </TASK>
ip6_tunnel: ip6gre2 xmit: Local address not yet configured!
watchdog: BUG: soft lockup - CPU#0 stuck for 222s! [syz-executor:5614]
Modules linked in:
irq event stamp: 3749888
hardirqs last  enabled at (3749887): [<ffffffff8bb8b73d>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
hardirqs last  enabled at (3749887): [<ffffffff8bb8b73d>] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline]
hardirqs last  enabled at (3749887): [<ffffffff8bb8b73d>] irqentry_exit+0x24d/0xa00 kernel/entry/common.c:167
hardirqs last disabled at (3749888): [<ffffffff8bb8a31e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062
softirqs last  enabled at (3749884): [<ffffffff81c86222>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (3749884): [<ffffffff81c86222>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (3749884): [<ffffffff81c86222>] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
softirqs last disabled at (3749811): [<ffffffff81c86222>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (3749811): [<ffffffff81c86222>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (3749811): [<ffffffff81c86222>] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
CPU: 0 UID: 0 PID: 5614 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x589/0x16c0 kernel/smp.c:892
Code: b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 a9 95 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 2c 0f 00 00 8b 45 08 31
RSP: 0000:ffffc90003fdf888 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81fd3abd
RDX: ffff88807bd98000 RSI: ffffffff81fd3a97 RDI: ffff88807bd98000
RBP: ffff8880b8541240 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170a8249 R14: 0000000000000001 R15: ffff8880b843c880
FS:  0000555572495500(0000) GS:ffff888123dec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555724b0a48 CR3: 000000005b8ab000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x45f/0x16f0 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:345 [inline]
 ptep_clear_flush+0x148/0x170 mm/pgtable-generic.c:104
 wp_page_copy mm/memory.c:3941 [inline]
 do_wp_page+0x12a4/0x4350 mm/memory.c:4336
 handle_pte_fault mm/memory.c:6395 [inline]
 __handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6517
 handle_mm_fault+0x37b/0xa30 mm/memory.c:6686
 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f60ec3629e0
Code: e4 28 00 48 8d 0c 1e 49 39 d0 49 89 48 60 0f 95 c2 48 29 d8 0f b6 d2 48 83 c8 01 48 c1 e2 02 48 09 da 48 83 ca 01 48 89 56 08 <48> 89 41 08 48 8d 4e 10 eb b0 48 8d 0d a7 da 0c 00 ba 9e 10 00 00
RSP: 002b:00007ffd0c3bd680 EFLAGS: 00010206
RAX: 00000000000185c1 RBX: 0000000000008040 RCX: 00005555724b0a40
RDX: 0000000000008041 RSI: 00005555724a8a00 RDI: 0000000000000004
RBP: 0000000000000802 R08: 00007f60ec5f0e20 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008030
R13: 0000000000000000 R14: 00007f60ec5f0e80 R15: 0000000000000000
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14256 Comm: syz.4.1856 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:preempt_count_add+0x3d/0x150 kernel/sched/core.c:5985
Code: fc ff df 48 89 c1 53 83 e0 07 89 fb 48 c1 e9 03 83 c0 03 65 01 3d 33 19 8e 12 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 de 00 00 00 <8b> 15 ed 8e 9d 19 65 8b 05 16 19 8e 12 85 d2 75 0b 0f b6 d0 81 fa
RSP: 0018:ffffc90000a08d80 EFLAGS: 00000097
RAX: 0000000000000003 RBX: 0000000000000001 RCX: 1ffffffff36e56c0
RDX: 0000000000000004 RSI: ffffffff8bd2f980 RDI: 0000000000000001
RBP: 0000000000000006 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff9b919a48
R13: dffffc0000000000 R14: ffff88807abe9300 R15: 1ffff920001411b8
FS:  00007f2fa79e26c0(0000) GS:ffff888123eec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 00000000359bf000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:131 [inline]
 _raw_spin_lock_irqsave+0x1e/0x60 kernel/locking/spinlock.c:166
 debug_object_deactivate+0x135/0x3b0 lib/debugobjects.c:936
 debug_hrtimer_deactivate kernel/time/hrtimer.c:490 [inline]
 __run_hrtimer kernel/time/hrtimer.c:2000 [inline]
 __hrtimer_run_queues+0x2e9/0x9c0 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:__rcu_read_unlock+0xad/0x5e0 kernel/rcu/tree_plugin.h:441
Code: c8 04 00 00 85 c0 75 51 48 8d bb c4 04 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 8b 01 00 00 8b 83 c4 04 00 00 3d
RSP: 0018:ffffc90004407908 EFLAGS: 00000202
RAX: 0000000000000004 RBX: ffff88803783a540 RCX: ffffc90004407904
RDX: 0000000000000000 RSI: ffffffff8e17cd3b RDI: ffff88803783aa04
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000005
R13: ffffc90004407a78 R14: dffffc0000000000 R15: ffff88801bc62000
 rcu_read_unlock include/linux/rcupdate.h:873 [inline]
 atomic_notifier_call_chain+0xa8/0x1c0 kernel/notifier.c:224
 do_con_write+0x487/0x4a30 drivers/tty/vt/vt.c:3319
 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3661
 process_output_block drivers/tty/n_tty.c:557 [inline]
 n_tty_write+0x431/0x1160 drivers/tty/n_tty.c:2366
 iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
 file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 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: 0033:0x7f2fa6b9de59
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:00007f2fa79e2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2fa6e26180 RCX: 00007f2fa6b9de59
RDX: 0000000000001006 RSI: 0000200000002080 RDI: 0000000000000006
RBP: 00007f2fa6c33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2fa6e26218 R14: 00007f2fa6e26180 R15: 00007ffd08165898
 </TASK>