rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=bbbc/1/0x4000000000000000 softirq=46913/46918 fqs=295
	(detected by 1, t=10506 jiffies, g=64437, q=4054 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9152 Comm: modprobe Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:mark_usage kernel/locking/lockdep.c:4508 [inline]
RIP: 0010:__lock_acquire+0xb9d/0x7c50 kernel/locking/lockdep.c:5003
Code: 0c 00 0f 84 bf 0f 00 00 83 7c 24 34 00 4c 8b 74 24 78 0f 84 d4 01 00 00 48 8b 44 24 50 42 0f b6 04 00 84 c0 0f 85 fc 5c 00 00 <41> 8b 07 66 85 c0 0f 88 d2 00 00 00 65 8b 0d f4 7b 9f 7e a9 00 00
RSP: 0018:ffffc900000078c0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880608b8ac4 RCX: ffff8880608b8000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff908b83f0
RBP: ffffc90000007b10 R08: dffffc0000000000 R09: fffffbfff211707f
R10: fffffbfff211707f R11: 1ffffffff211707e R12: ffff8880608b8000
R13: ffff8880608b8b02 R14: ffff8880608b8b08 R15: ffff8880608b8b28
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd48489d0c CR3: 0000000078b58000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0x47/0x970 net/sched/sch_taprio.c:700
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x522/0xc80 kernel/time/hrtimer.c:1755
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1817
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__sanitizer_cov_trace_switch+0xd0/0xe0 kernel/kcov.c:-1
Code: f3 48 c1 e3 05 4c 8d 63 28 4d 39 fc 77 9d 49 ff c6 4d 89 33 49 89 4c 1b 08 4d 89 54 1b 10 49 89 7c 1b 18 49 89 54 1b 20 eb 81 <5b> 41 5c 41 5e 41 5f c3 0f 1f 84 00 00 00 00 00 c7 87 f8 15 00 00
RSP: 0018:ffffc900035b7908 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffffffffffff RCX: 0000000000000007
RDX: ffffffff89fc7f95 RSI: ffffffff8de76e90 RDI: ffff88807568600c
RBP: dffffc0000000000 R08: ffff8880608b8000 R09: 0000000000000002
R10: 0000000000000009 R11: 0000000000000000 R12: ffff88807568600c
R13: ffffc900035b79d8 R14: ffffc900035b79c0 R15: ffff88807568600c
 mas_find+0x95/0x230 lib/maple_tree.c:6109
 validate_mm+0x1d4/0x2b0 mm/mmap.c:333
 mmap_region+0x7aa/0x1d30 mm/mmap.c:2910
 do_mmap+0x894/0xf30 mm/mmap.c:1424
 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520
 ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1470
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f55a0652242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffd48489968 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f55a0602000 RCX: 00007f55a0652242
RDX: 0000000000000001 RSI: 0000000000028000 RDI: 00007f55a0602000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000096000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffd484899f0
R13: 00007f55a062e0c0 R14: 00007ffd48489d70 R15: 00000fffa9091330
 </TASK>
rcu: rcu_preempt kthread starved for 9030 jiffies! g64437 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:27840 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 4323 Comm: kworker/1:5 Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events drain_vmap_area_work
RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_many_cond+0xe7b/0x1270 kernel/smp.c:998
Code: 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 6d e9 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 f9 e5 0a 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 de e5 0a
RSP: 0018:ffffc90004727940 EFLAGS: 00000293
RAX: ffffffff8175f132 RBX: dffffc0000000000 RCX: ffff8880240d0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004727aa0 R08: dffffc0000000000 R09: fffffbfff211704a
R10: fffffbfff211704a R11: 1ffffffff2117049 R12: 1ffff110171c85a5
R13: ffff8880b8f3bb00 R14: 0000000000000000 R15: ffff8880b8e42d28
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f761128cbe5 CR3: 000000000c68e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1166
 __purge_vmap_area_lazy+0x216/0x1900 mm/vmalloc.c:1753
 drain_vmap_area_work+0x3c/0xd0 mm/vmalloc.c:1803
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>