vkms_vblank_simulate: vblank timer overrun rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=c484/1/0x4000000000000000 softirq=24551/24552 fqs=1 rcu: (detected by 1, t=10502 jiffies, g=15301, q=176 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7426 Comm: syz.4.415 Not tainted 6.16.0-rc1-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__lock_acquire+0x3f7/0x1c90 kernel/locking/lockdep.c:5213 Code: 48 89 ef e8 9b f3 ff ff 85 c0 74 5e ba 08 00 00 00 4c 89 ee 48 89 ef e8 87 f3 ff ff 85 c0 74 4a 8b 05 dd f3 43 19 85 c0 74 72 <48> 8b 8d e0 0a 00 00 85 db 0f 85 56 03 00 00 8b 05 c4 f3 43 19 85 RSP: 0018:ffffc90000007bc8 EFLAGS: 00000047 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000008 RDX: 0000000000000000 RSI: ffff88807c3c53e8 RDI: ffff88807c3c4880 RBP: ffff88807c3c4880 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000078 R11: 0000000000000001 R12: ffff88807c3c5370 R13: ffff88807c3c53e8 R14: 0000000000000003 R15: 0000000000000002 FS: 00007f9d9ce4f6c0(0000) GS:ffff888124754000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2ddce2 CR3: 000000007d11e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 debug_object_activate+0x14c/0x4c0 lib/debugobjects.c:818 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:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_flush_all+0x9a2/0xc60 kernel/printk/printk.c:3227 Code: 00 e8 92 99 28 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 40 c4 20 00 48 85 db 0f 85 55 01 00 00 e8 c2 c8 20 00 fb 4c 89 e0 <48> c1 e8 03 42 80 3c 38 00 0f 84 11 ff ff ff 4c 89 e7 e8 a7 86 87 RSP: 0018:ffffc900036f6f90 EFLAGS: 00000287 RAX: ffffffff8f2eb858 RBX: 0000000000000000 RCX: ffffc9000e3da000 RDX: 0000000000080000 RSI: ffffffff819b53ee RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8f2eb858 R13: ffffffff8f2eb800 R14: ffffc900036f7020 R15: dffffc0000000000 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3325 vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450 _printk+0xc7/0x100 kernel/printk/printk.c:2475 validate_nla lib/nlattr.c:414 [inline] __nla_validate_parse+0x1870/0x2880 lib/nlattr.c:635 __nla_parse+0x40/0x60 lib/nlattr.c:732 __nlmsg_parse include/net/netlink.h:787 [inline] nlmsg_parse_deprecated include/net/netlink.h:828 [inline] rtnl_newlink+0x19a/0x2000 net/core/rtnetlink.c:3960 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9d9bf8e929 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:00007f9d9ce4f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9d9c1b5fa0 RCX: 00007f9d9bf8e929 RDX: 0000000004058880 RSI: 0000200000000600 RDI: 0000000000000003 RBP: 00007f9d9c010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9d9c1b5fa0 R15: 00007fff9345fe08 rcu: rcu_preempt kthread starved for 10500 jiffies! g15301 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:27272 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6878 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 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: 1 UID: 0 PID: 7428 Comm: syz.0.414 Not tainted 6.16.0-rc1-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x20 kernel/kcov.c:314 Code: bf 03 00 00 00 e9 58 fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 0c 24 <89> f2 89 fe bf 05 00 00 00 e9 2a fe ff ff 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc900036e7a40 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff8880b8443ba0 RCX: ffffffff81b0011d RDX: 0000000000080000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000000003 R14: ffffed1017088775 R15: ffff8880b853cf40 FS: 00007f8e2ab4d6c0(0000) GS:ffff888124854000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8e2ab4cf98 CR3: 000000005d82f000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:340 [inline] smp_call_function_many_cond+0xd9d/0x1510 kernel/smp.c:885 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2660 [inline] smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2870 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x376/0x550 kernel/jump_label.c:919 static_key_slow_inc_cpuslocked kernel/jump_label.c:168 [inline] static_key_slow_inc_cpuslocked+0x82/0x120 kernel/jump_label.c:151 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191 io_uring_create io_uring/io_uring.c:3688 [inline] io_uring_setup+0x18f9/0x2120 io_uring/io_uring.c:3827 __do_sys_io_uring_setup io_uring/io_uring.c:3861 [inline] __se_sys_io_uring_setup io_uring/io_uring.c:3852 [inline] __x64_sys_io_uring_setup+0xc2/0x170 io_uring/io_uring.c:3852 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8e29d8e929 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:00007f8e2ab4d038 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00007f8e29fb5fa0 RCX: 00007f8e29d8e929 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000191a RBP: 00007f8e29e10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f8e29fb5fa0 R15: 00007ffc30590148 watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz.0.414:7428] Modules linked in: irq event stamp: 895542 hardirqs last enabled at (895541): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:310 hardirqs last disabled at (895542): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (895538): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (895538): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:607 softirqs last disabled at (895523): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (895523): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (895523): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 7428 Comm: syz.0.414 Not tainted 6.16.0-rc1-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+0xd7b/0x1510 kernel/smp.c:885 Code: e8 1a 17 0c 00 45 85 ed 74 46 48 8b 14 24 49 89 d6 49 89 d5 49 c1 ee 03 41 83 e5 07 4d 01 e6 41 83 c5 03 e8 b7 1b 0c 00 f3 90 <41> 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 6f 05 00 00 8b 43 08 31 ff RSP: 0018:ffffc900036e7a48 EFLAGS: 00000246 RAX: 0000000000080000 RBX: ffff8880b8443ba0 RCX: ffffc90005a73000 RDX: 0000000000080000 RSI: ffffffff81b000f9 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000000003 R14: ffffed1017088775 R15: ffff8880b853cf40 FS: 00007f8e2ab4d6c0(0000) GS:ffff888124854000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8e2ab4cf98 CR3: 000000005d82f000 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 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2660 [inline] smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2870 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x376/0x550 kernel/jump_label.c:919 static_key_slow_inc_cpuslocked kernel/jump_label.c:168 [inline] static_key_slow_inc_cpuslocked+0x82/0x120 kernel/jump_label.c:151 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191 io_uring_create io_uring/io_uring.c:3688 [inline] io_uring_setup+0x18f9/0x2120 io_uring/io_uring.c:3827 __do_sys_io_uring_setup io_uring/io_uring.c:3861 [inline] __se_sys_io_uring_setup io_uring/io_uring.c:3852 [inline] __x64_sys_io_uring_setup+0xc2/0x170 io_uring/io_uring.c:3852 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8e29d8e929 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:00007f8e2ab4d038 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00007f8e29fb5fa0 RCX: 00007f8e29d8e929 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000191a RBP: 00007f8e29e10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f8e29fb5fa0 R15: 00007ffc30590148 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7426 Comm: syz.4.415 Not tainted 6.16.0-rc1-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1761 [inline] RIP: 0010:__hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825 Code: 00 00 fc ff df 0f b6 04 01 84 c0 74 08 3c 03 0f 8e 5f 08 00 00 48 8b 44 24 30 4c 89 f7 c7 80 d8 0a 00 00 01 00 00 00 41 ff d7 <0f> 1f 00 41 89 c7 48 8b 44 24 18 48 8d b8 d8 0a 00 00 48 b8 00 00 RSP: 0018:ffffc90000007e40 EFLAGS: 00000082 RAX: 0000000000000001 RBX: ffff8880b8427d80 RCX: ffffc90000007d54 RDX: 0000000000000000 RSI: ffffffff8ddf3a61 RDI: ffff88807c3c4cc4 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880b8427c80 R13: 0000000000000000 R14: ffff88801b962340 R15: ffffffff899272e0 FS: 00007f9d9ce4f6c0(0000) GS:ffff888124754000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2ddce2 CR3: 000000007d11e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_flush_all+0x9a2/0xc60 kernel/printk/printk.c:3227 Code: 00 e8 92 99 28 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 40 c4 20 00 48 85 db 0f 85 55 01 00 00 e8 c2 c8 20 00 fb 4c 89 e0 <48> c1 e8 03 42 80 3c 38 00 0f 84 11 ff ff ff 4c 89 e7 e8 a7 86 87 RSP: 0018:ffffc900036f6f90 EFLAGS: 00000287 RAX: ffffffff8f2eb858 RBX: 0000000000000000 RCX: ffffc9000e3da000 RDX: 0000000000080000 RSI: ffffffff819b53ee RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8f2eb858 R13: ffffffff8f2eb800 R14: ffffc900036f7020 R15: dffffc0000000000 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3325 vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450 _printk+0xc7/0x100 kernel/printk/printk.c:2475 validate_nla lib/nlattr.c:414 [inline] __nla_validate_parse+0x1870/0x2880 lib/nlattr.c:635 __nla_parse+0x40/0x60 lib/nlattr.c:732 __nlmsg_parse include/net/netlink.h:787 [inline] nlmsg_parse_deprecated include/net/netlink.h:828 [inline] rtnl_newlink+0x19a/0x2000 net/core/rtnetlink.c:3960 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9d9bf8e929 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:00007f9d9ce4f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9d9c1b5fa0 RCX: 00007f9d9bf8e929 RDX: 0000000004058880 RSI: 0000200000000600 RDI: 0000000000000003 RBP: 00007f9d9c010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9d9c1b5fa0 R15: 00007fff9345fe08