rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=e8c4/1/0x4000000000000000 softirq=82347/82348 fqs=5
rcu: 	(detected by 1, t=10505 jiffies, g=55809, q=191 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11361 Comm: syz.4.1654 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:num_possible_cpus include/linux/cpumask.h:1222 [inline]
RIP: 0010:mm_get_cid kernel/sched/sched.h:3850 [inline]
RIP: 0010:sched_mm_cid_fork+0x5b0/0x1120 kernel/sched/core.c:10679
Code: 00 00 31 ed 31 db e9 7b 01 00 00 49 c7 c4 98 fe 1a 8e 49 c1 ec 03 41 bd 00 00 00 80 eb 0a 89 e8 f7 d8 0f 81 e3 fe ff ff f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 40 44 8b 35
RSP: 0000:ffffc9000c067c48 EFLAGS: 00000887
RAX: 0000000080000000 RBX: ffff88803152a410 RCX: 0000000080000001
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff88803152a410
RBP: 0000000080000000 R08: 1ffff110062a5331 R09: 0000000000000000
R10: ffff888031529ad4 R11: fffff5200180cf78 R12: 1ffffffff1c35fd3
R13: 0000000080000000 R14: 0000000000000002 R15: ffff888031529880
FS:  0000000000000000(0000) GS:ffff888125460000(0063) knlGS:00000000f54bdb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f729f8c9 CR3: 00000000281ba000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: 0000000000000030 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bprm_execve+0xda1/0x1460 fs/exec.c:1771
 do_execveat_common+0x50d/0x690 fs/exec.c:1846
 __do_compat_sys_execveat fs/exec.c:1968 [inline]
 __se_compat_sys_execveat fs/exec.c:1961 [inline]
 __ia32_compat_sys_execveat+0xcd/0xf0 fs/exec.c:1961
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 do_int80_emulation+0x173/0x4d0 arch/x86/entry/syscall_32.c:172
 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0023:0xf70cef6c
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f54bd50c EFLAGS: 00000206 ORIG_RAX: 0000000000000166
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000080000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000001000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10480 jiffies! g55809 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:27744 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:
CPU: 1 UID: 0 PID: 5489 Comm: dhcpcd 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:__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 cd 4f f1 f5 f7 c3 00 02 00 00 74 05 e8 d0 a7 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 0c e3 f5 65 8b 05 0d 20 6b 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc90000a08a88 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000103
RDX: 0000000000000002 RSI: ffffffff8def6c33 RDI: 0000000000000001
RBP: ffffc90000a08d70 R08: ffffffff90119ab7 R09: 1ffffffff2023356
R10: dffffc0000000000 R11: fffffbfff2023357 R12: dffffc0000000000
R13: 000000000000d000 R14: ffff888029c34000 R15: ffff888029d56470
FS:  00007f5b67fcb780(0000) GS:ffff888125560000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7496288 CR3: 00000000359ca000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
 dummy_timer+0x44a2/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:-1
 __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:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x36/0x70 kernel/kcov.c:217
Code: 18 5f 56 11 65 8b 15 39 5f 56 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 a4 16 00 00 00 74 2c 8b 91 80 16 00 00 <83> fa 02 75 21 48 8b 91 88 16 00 00 48 8b 32 48 8d 7e 01 8b 89 84
RSP: 0018:ffffc90003497578 EFLAGS: 00000246
RAX: ffffffff81b9be9d RBX: 1ffff110170c8515 RCX: ffff88801f303d00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900034976a8 R08: ffffffff90119ab7 R09: 1ffffffff2023356
R10: dffffc0000000000 R11: fffffbfff2023357 R12: ffff8880b86428a8
R13: dffffc0000000000 R14: ffff8880b873bf80 R15: 0000000000000000
 csd_lock_wait kernel/smp.c:342 [inline]
 smp_call_function_many_cond+0xcfd/0x12c0 kernel/smp.c:877
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:57 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline]
 flush_tlb_mm_range+0x5c3/0x10c0 arch/x86/mm/tlb.c:1472
 dup_mmap+0x17a2/0x1d90 mm/mmap.c:1906
 dup_mm kernel/fork.c:1531 [inline]
 copy_mm+0x13b/0x4a0 kernel/fork.c:1583
 copy_process+0x18b6/0x3cd0 kernel/fork.c:2223
 kernel_clone+0x248/0x8e0 kernel/fork.c:2653
 __do_sys_clone kernel/fork.c:2794 [inline]
 __se_sys_clone kernel/fork.c:2778 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2778
 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: 0033:0x7f5b6809f636
Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffc6479bb40 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc6479bb48 RCX: 00007f5b6809f636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc647bc090 R08: 0000000000000000 R09: 0000000000000001
R10: 00007f5b67fcba50 R11: 0000000000000246 R12: 00007ffc6479bc80
R13: 0000000000000000 R14: 0000000000000000 R15: 0000557d21b50ac0
 </TASK>