rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (2 ticks this GP) idle=27ac/1/0x4000000000000000 softirq=75132/75138 fqs=2
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5830/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=60589, q=62 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15656 Comm: syz.4.2725 Not tainted 6.15.0-rc7-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__lock_release kernel/locking/lockdep.c:5562 [inline]
RIP: 0010:lock_release+0x10b/0x2f0 kernel/locking/lockdep.c:5887
Code: 8e ff ff 48 85 c0 0f 84 47 01 00 00 8b 50 24 85 d2 0f 85 ae 01 00 00 66 83 78 22 1f 76 0c 66 83 68 22 20 66 83 78 22 1f 77 3c <8b> 54 24 0c 41 89 96 e8 0a 00 00 48 8b 00 49 89 86 e0 0a 00 00 41
RSP: 0018:ffffc90000007cc0 EFLAGS: 00000097
RAX: ffff888029ea53e8 RBX: ffffffff9add53e0 RCX: ffffc90000007ccc
RDX: 0000000000000000 RSI: ffffffff9add53e0 RDI: ffff888029ea53e8
RBP: 0000000000000006 R08: 0000000000000001 R09: fffff52000000f92
R10: 0000000000000006 R11: ffffffff9add53c8 R12: ffffffff84d6af7c
R13: 0000000000000006 R14: ffff888029ea4880 R15: 0000000000000004
FS: 00007fdb0f9896c0(0000) GS:ffff8881249da000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000350cc000 CR4: 00000000003526f0
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
_raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:194
debug_object_activate+0x2ec/0x4c0 lib/debugobjects.c:836
debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
debug_activate kernel/time/hrtimer.c:484 [inline]
enqueue_hrtimer+0x23/0x3b0 kernel/time/hrtimer.c:1088
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x8ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__schedule+0x1177/0x5de0 kernel/sched/core.c:6773
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 17 49 00 00 49 89 5f 10 48 8b bd 10 ff ff ff 48 89 de e8 51 a7 bd f5 48 89 c7 e8 c9 87 1b f6 <48> 8b 75 08 8b bd 08 ff ff ff e8 7a fb 1a f6 48 8b b5 88 fe ff ff
RSP: 0018:ffffc9000df77648 EFLAGS: 00000202
RAX: 0000000000000d1f RBX: ffff888029ea4880 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8dbe41e5 RDI: ffffffff8bf4a220
RBP: ffffc9000df777f8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90852e17 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888029ea4880 R15: ffff8880b8439dc0
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7090
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: b6 5f 55 00 48 89 df 5b e9 0d bc 5a 00 be 03 00 00 00 5b e9 32 e1 15 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 34 24 65 48 8b 15 18 1a e9 11 65 8b 05 29 1a e9
RSP: 0018:ffffc9000df778d0 EFLAGS: 00000296
RAX: 000000000000443c RBX: ffff888034990e10 RCX: ffffc9000cffd000
RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffffff8cc268a0
RBP: ffffc9000df77960 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8cc268a0
R13: ffff88802073ff00 R14: ffffffff8cc268a0 R15: 0000000000000000
kernfs_name_hash+0x19/0x120 fs/kernfs/dir.c:318
kernfs_add_one+0x1d9/0x840 fs/kernfs/dir.c:808
__kernfs_create_file+0x295/0x350 fs/kernfs/file.c:1067
sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:319
create_files fs/sysfs/group.c:76 [inline]
internal_create_group+0x578/0xf30 fs/sysfs/group.c:183
internal_create_groups+0x9d/0x150 fs/sysfs/group.c:223
device_add_groups drivers/base/core.c:2839 [inline]
device_add_attrs drivers/base/core.c:2903 [inline]
device_add+0x6d1/0x1a70 drivers/base/core.c:3646
netdev_register_kobject+0x182/0x3a0 net/core/net-sysfs.c:2336
register_netdevice+0x13dc/0x2270 net/core/dev.c:10999
tun_set_iff drivers/net/tun.c:2781 [inline]
__tun_chr_ioctl+0x1ee4/0x4740 drivers/net/tun.c:3048
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl fs/ioctl.c:892 [inline]
__x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdb0eb8e969
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:00007fdb0f989038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdb0edb6080 RCX: 00007fdb0eb8e969
RDX: 0000200000000200 RSI: 00000000400454ca RDI: 0000000000000005
RBP: 00007fdb0ec10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdb0edb6080 R15: 00007ffe4a9c5488
task:kworker/0:3 state:R running task stack:22040 pid:5830 tgid:5830 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: events delayed_vfree_work
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7090
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:unwind_next_frame+0x3ae/0x20a0 arch/x86/kernel/unwind_orc.c:678
Code: 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 0f b6 04 02 4c 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 69 16 00 00 41 c6 45 34 01 <48> b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04 02 84
RSP: 0018:ffffc9000449f870 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff911367cc
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffffff909233dc
RBP: ffffc9000449f928 R08: ffffffff911367f6 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000002bb0 R12: ffffc9000449f930
R13: ffffc9000449f8e0 R14: ffffc9000449f915 R15: ffffffff911367d1
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x160/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x84/0x1a0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1258 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2721
vfree+0x176/0x960 mm/vmalloc.c:3384
delayed_vfree_work+0x56/0x70 mm/vmalloc.c:3304
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread starved for 10498 jiffies! g60589 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:27304 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2046
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2248
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 15634 Comm: syz.6.2720 Not tainted 6.15.0-rc7-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x4aa/0x1290 kernel/smp.c:885
Code: 0c 00 85 ed 74 48 48 8b 44 24 20 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 f4 83 c5 03 e8 7d 17 0c 00 f3 90 41 0f b6 04 24 <40> 38 c5 7c 08 84 c0 0f 85 de 0b 00 00 8b 43 08 31 ff 83 e0 01 41
RSP: 0018:ffffc9000b40f7c8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b8441720 RCX: ffffffff81af2e99
RDX: ffff888037118000 RSI: ffffffff81af2e73 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffed10170882e5
R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8880b853b040
FS: 0000000000000000(0000) GS:ffff888124ada000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000033c0 CR3: 0000000048996000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1291 [inline]
flush_tlb_mm_range+0x322/0x1780 arch/x86/mm/tlb.c:1381
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:470 [inline]
tlb_flush_mmu mm/mmu_gather.c:403 [inline]
tlb_finish_mmu+0x3c9/0x7b0 mm/mmu_gather.c:496
exit_mmap+0x403/0xb90 mm/mmap.c:1297
__mmput+0x12a/0x410 kernel/fork.c:1380
mmput+0x62/0x70 kernel/fork.c:1402
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
get_signal+0x2673/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f366258e969
Code: Unable to access opcode bytes at 0x7f366258e93f.
RSP: 002b:00007f36633b7038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 0000000000297308 RBX: 00007f36627b5fa0 RCX: 00007f366258e969
RDX: 0000000000000010 RSI: 0000200000000080 RDI: 0000000000000005
RBP: 00007f3662610ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f36627b5fa0 R15: 00007fff3aaa4cf8