rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=31881, q=1940 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 608 (4294972739-4294972131), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 608 jiffies! g31881 f0x2 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:28120 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 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:
Sending NMI from CPU 1 to CPUs 0:
radio-si470x 1-1:0.0: non-zero urb status (-71)
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5174 Comm: klogd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x10/0x90 kernel/kcov.c:314
Code: ff cc 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 04 24 65 48 8b 15 b8 8a 56 11 <65> 8b 0d d9 8a 56 11 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75
RSP: 0018:ffffc90000006f08 EFLAGS: 00000046
RAX: ffffffff81a5c2ca RBX: 0000000000000030 RCX: ffff88807d583d00
RDX: ffff88807d583d00 RSI: 0000000000000030 RDI: 0000000000000000
RBP: 0000000000000038 R08: ffffc90000007257 R09: 1ffff92000000e4a
R10: dffffc0000000000 R11: fffff52000000e4b R12: 1ffff92000000e07
R13: dffffc0000000000 R14: ffffc90000007068 R15: 0000000000020000
FS:  00007f4881786c80(0000) GS:ffff88812545d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555571d544e8 CR3: 000000007e06e000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 get_data+0x3fa/0x8e0 kernel/printk/printk_ringbuffer.c:1306
 copy_data kernel/printk/printk_ringbuffer.c:1884 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1993 [inline]
 _prb_read_valid+0x616/0xa80 kernel/printk/printk_ringbuffer.c:2170
 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2242
 printk_get_next_message+0x18b/0x880 kernel/printk/printk.c:3052
 console_emit_next_record kernel/printk/printk.c:3137 [inline]
 console_flush_one_record kernel/printk/printk.c:3269 [inline]
 console_flush_all+0x501/0xb20 kernel/printk/printk.c:3343
 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
 console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
 dev_vprintk_emit+0x355/0x420 drivers/base/core.c:4913
 dev_printk_emit+0xee/0x140 drivers/base/core.c:4924
 _dev_warn+0x11e/0x180 drivers/base/core.c:4980
 si470x_int_in_callback+0x9cc/0xf20 drivers/media/radio/si470x/radio-si470x-usb.c:378
 __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1657
 dummy_timer+0xbbd/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
 handle_softirqs+0x22a/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
Code: f7 e8 ed 1f f1 f5 f7 c3 00 02 00 00 74 05 e8 f0 77 1c f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> b4 dc e2 f5 65 8b 05 0d 20 6b 07 85 c0 74 18 5b 41 5e e9 dc 30
RSP: 0018:ffffc90004007590 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000282 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8def7890 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9011a3b7 R09: 1ffffffff2023476
R10: dffffc0000000000 R11: fffffbfff2023477 R12: ffff888038e3c000
R13: ffff888038e38000 R14: ffffffff9a4ab938 R15: 0000000000000003
 __debug_check_no_obj_freed lib/debugobjects.c:1125 [inline]
 debug_check_no_obj_freed+0x52e/0x550 lib/debugobjects.c:1146
 __free_pages_prepare mm/page_alloc.c:1440 [inline]
 __free_frozen_pages+0x549/0xdb0 mm/page_alloc.c:2978
 __slab_free+0x263/0x2b0 mm/slub.c:5573
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4538 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 __do_kmalloc_node mm/slub.c:5259 [inline]
 __kmalloc_node_track_caller_noprof+0x493/0x7b0 mm/slub.c:5368
 kmalloc_reserve net/core/skbuff.c:635 [inline]
 __alloc_skb+0x2c1/0x7d0 net/core/skbuff.c:713
 alloc_skb include/linux/skbuff.h:1383 [inline]
 alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6763
 sock_alloc_send_pskb+0x878/0x990 net/core/sock.c:2995
 unix_dgram_sendmsg+0x460/0x18e0 net/unix/af_unix.c:2127
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 __sys_sendto+0x672/0x710 net/socket.c:2206
 __do_sys_sendto net/socket.c:2213 [inline]
 __se_sys_sendto net/socket.c:2209 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2209
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f48818d6407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffcf1001b00 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f4881786c80 RCX: 00007f48818d6407
RDX: 0000000000000061 RSI: 00007ffcf1001c40 RDI: 0000000000000003
RBP: 00007ffcf1002070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000202 R12: 00007ffcf1002088
R13: 00007ffcf1001c40 R14: 0000000000000046 R15: 00007ffcf1001c40
 </TASK>
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
radio-si470x 1-1:0.0: non-zero urb status (-71)
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