rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
 P14983/1:b..l
 P14988/1:b..l

rcu: 	(detected by 1, t=10502 jiffies, g=100621, q=626 ncpus=2)
task:syz.4.2653      state:R
  running task     stack:24104 pid:14988 tgid:14986 ppid:5858   task_flags:0x400040 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_is_watching+0x67/0xb0 kernel/rcu/tree.c:737
Code: 89 f7 e8 fc cd 84 00 48 c7 c3 58 8b 69 93 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 22 8b 03 65 ff 0d f9 31 c0 11 <74> 10 83 e0 04 c1 e8 02 5b 41 5e 41 5f c3 cc cc cc cc e8 32 1b 82
RSP: 0018:ffffc9000b5c73e0 EFLAGS: 00000286

RAX: 0000000000c5c95c RBX: ffff8880b8732b58 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8ca1b5a0 RDI: ffffffff8ca1b560
RBP: ffffffff93686020 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100b0d8b2d R12: 0000000000000000
R13: 0000000000000002 R14: ffffffff8e79bc18 R15: dffffc0000000000
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x5e/0x2f0 kernel/locking/lockdep.c:5829
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 count_memcg_events_mm include/linux/memcontrol.h:986 [inline]
 count_memcg_event_mm+0xb7/0x440 include/linux/memcontrol.h:996
 mm_account_fault mm/memory.c:6174 [inline]
 handle_mm_fault+0x171f/0x1bf0 mm/memory.c:6335
 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline]
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x2bb/0x920 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_nocheck_4+0x3/0x10 arch/x86/lib/putuser.S:104
Code: d9 0f 01 cb 89 01 31 c9 0f 01 ca c3 cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000b5c78f8 EFLAGS: 00050202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000200000139030
RDX: ffff888044dd9e00 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc9000b5c7a70 R08: ffffffff89dfc844 R09: 1ffff920016b8ed4
R10: dffffc0000000000 R11: fffff520016b8ed5 R12: 0000200000139000
R13: 0000000000000002 R14: 0000000000000000 R15: ffffc9000b5c7d00
 ____sys_recvmsg+0x2ac/0x480 net/socket.c:2799
 ___sys_recvmsg net/socket.c:2828 [inline]
 do_recvmmsg+0x428/0xab0 net/socket.c:2923
 __sys_recvmmsg net/socket.c:2997 [inline]
 __do_sys_recvmmsg net/socket.c:3020 [inline]
 __se_sys_recvmmsg net/socket.c:3013 [inline]
 __x64_sys_recvmmsg+0x1ab/0x260 net/socket.c:3013
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae8658e169
RSP: 002b:00007fae87424038 EFLAGS: 00000246
 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fae867b6080 RCX: 00007fae8658e169
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007fae86610a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fae867b6080 R15: 00007fae868dfa28
 </TASK>
task:syz.2.2652      state:R
  running task     stack:24616 pid:14983 tgid:14983 ppid:5859   task_flags:0x400040 flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0xb/0x3e0 kernel/locking/lockdep.c:5874
Code: f9 ff ff 66 66 66 2e 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 55 41 57 41 56 41 55 <41> 54 53 48 83 ec 30 48 89 f5 49 89 ff 48 8d 1d d1 e7 c9 11 65 48
RSP: 0018:ffffc9000bb0f7c0 EFLAGS: 00000202

RAX: 0000000000000001 RBX: ffffc9000bb0f8c0 RCX: ffff88802700da00
RDX: dffffc0000000000 RSI: ffffffff816d9bc8 RDI: ffffffff8ed3df20
RBP: dffffc0000000001 R08: ffffc9000bb0ff48 R09: 0000000000000000
R10: ffffc9000bb0f910 R11: fffff52001761f24 R12: ffffc9000bb0f8d0
R13: dffffc0000000000 R14: ffffc9000bb0ff58 R15: ffffffff816d9bc8
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x1a9f/0x23b0 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2398 [inline]
 slab_free mm/slub.c:4656 [inline]
 kfree+0x198/0x430 mm/slub.c:4855
 kvm_destroy_vm_debugfs virt/kvm/kvm_main.c:1013 [inline]
 kvm_destroy_vm virt/kvm/kvm_main.c:1273 [inline]
 kvm_put_kvm+0x1d8/0xf50 virt/kvm/kvm_main.c:1346
 kvm_vm_release+0x43/0x50 virt/kvm/kvm_main.c:1369
 __fput+0x3e9/0x9f0 fs/file_table.c:465
 task_work_run+0x251/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x210 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf0538e169
RSP: 002b:00007fcf056dfb88 EFLAGS: 00000246
 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00000000000c9d2a RCX: 00007fcf0538e169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fcf055b7ba0 R08: 0000000000000001 R09: 0000000c056dfe7f
R10: 00007fcf05200000 R11: 0000000000000246 R12: 00007fcf055b5fac
R13: 00007fcf055b5fa0 R14: ffffffffffffffff R15: 00007fcf056dfca0
 </TASK>
rcu: rcu_preempt kthread starved for 10159 jiffies! g100621 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:26440 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
radio-si470x 2-1:0.0: non-zero urb status (-71)
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:409
Code: f0 20 2c fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 c1 5f 96 fc 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 cc cc cc cc 89 e9 80 e1 07 38 c1 7c
RSP: 0018:ffffc90000006df8 EFLAGS: 00000006
RAX: 1ffffffff354fb05 RBX: ffffffff9aa7dba0 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 00000000000105c1 RDI: 00000000000105c2
RBP: 0000000000000000 R08: ffffffff85969c26 R09: fffff52000000da0
R10: dffffc0000000000 R11: ffffffff85969be0 R12: 0000000000000000
R13: dffffc0000000000 R14: 00000000000003f9 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124f9a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2b04ac CR3: 000000004535e000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 serial_port_in include/linux/serial_core.h:791 [inline]
 serial8250_console_write+0x4c0/0x1e00 drivers/tty/serial/8250/8250_port.c:3420
 console_emit_next_record kernel/printk/printk.c:3138 [inline]
 console_flush_all+0x86b/0xec0 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325
 vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450
 dev_vprintk_emit+0x358/0x420 drivers/base/core.c:4891
 dev_printk_emit+0xdf/0x130 drivers/base/core.c:4902
 _dev_warn+0x12d/0x180 drivers/base/core.c:4958
 si470x_int_in_callback+0xaa2/0xff0 drivers/media/radio/si470x/radio-si470x-usb.c:378
 __usb_hcd_giveback_urb+0x42e/0x6e0 drivers/usb/core/hcd.c:1650
 dummy_timer+0x84b/0x4670 drivers/usb/gadget/udc/dummy_hcd.c:1994
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x5a6/0xd40 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1842
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:81
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 53 7e 18 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:ffffffff8ea07d60 EFLAGS: 000002c6
RAX: 8c02495301a30600 RBX: ffffffff8197272e RCX: ffffffff8c2fb89c
RDX: 0000000000000001 RSI: ffffffff8e64975f RDI: ffffffff8ca1b5c0
RBP: ffffffff8ea07eb8 R08: ffff8880b8632b5b R09: 1ffff110170c656b
R10: dffffc0000000000 R11: ffffed10170c656c R12: 1ffffffff1d40fc6
R13: 1ffffffff1d52cb0 R14: 0000000000000000 R15: dffffc0000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:748
 default_idle_call+0x74/0xb0 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:185 [inline]
 do_idle+0x22e/0x5d0 kernel/sched/idle.c:325
 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:423
 rest_init+0x2dc/0x300 init/main.c:743
 start_kernel+0x484/0x510 init/main.c:1099
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513
 x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:494
 common_startup_64+0x13e/0x147
 </TASK>
vkms_vblank_simulate: vblank timer overrun
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)
radio-si470x 2-1:0.0: non-zero urb status (-71)