rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12173/1:b..l P19973/1:b..l
rcu: 	(detected by 1, t=10504 jiffies, g=73709, q=219 ncpus=2)
task:modprobe        state:R  running task     stack:23304 pid:19973 tgid:19973 ppid:1158   task_flags:0x40000c flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:32 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline]
RIP: 0010:lock_release+0xaa/0x3e0 kernel/locking/lockdep.c:5888
Code: 92 41 83 bf ec 0a 00 00 00 0f 85 1e 02 00 00 49 81 3e 40 73 5d 93 0f 84 11 02 00 00 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 <48> 8b 5c 24 20 fa 48 c7 c7 5e 20 98 8d e8 94 d0 c1 09 65 ff 05 ad
RSP: 0018:ffffc900001f72b0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffffff903b0b01 RCX: efe16b0b156e4900
RDX: ffffc900001f7401 RSI: ffffffff8be1b960 RDI: ffffffff8be1b920
RBP: dffffc0000000000 R08: ffffc900001f77e0 R09: 0000000000000000
R10: ffffc900001f7438 R11: fffff5200003ee89 R12: ffffc900001f77f0
R13: ffffffff81728af5 R14: ffffffff8e13ee20 R15: ffff88807e2dda00
 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+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4359
 kmalloc_noprof include/linux/slab.h:905 [inline]
 slab_free_hook mm/slub.c:2333 [inline]
 slab_free mm/slub.c:4643 [inline]
 kmem_cache_free+0x166/0x400 mm/slub.c:4745
 anon_vma_free mm/rmap.c:137 [inline]
 __put_anon_vma+0x12b/0x2d0 mm/rmap.c:2756
 put_anon_vma include/linux/rmap.h:117 [inline]
 unlink_anon_vmas+0x503/0x670 mm/rmap.c:444
 free_pgtables+0x7bf/0xaf0 mm/memory.c:402
 exit_mmap+0x444/0xb50 mm/mmap.c:1295
 __mmput+0x118/0x420 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x648/0x22e0 kernel/exit.c:952
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
 __do_sys_exit_group kernel/exit.c:1116 [inline]
 __se_sys_exit_group kernel/exit.c:1114 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1114
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdca18396c5
RSP: 002b:00007ffc0942cb98 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdca193afe8 RCX: 00007fdca18396c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffc0942cb28 R09: 0000000000000000
R10: 00007ffc0942c9c0 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fdca1939680 R15: 00007fdca193b000
 </TASK>
task:syz-executor    state:R  running task     stack:21568 pid:12173 tgid:12173 ppid:12144  task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6965
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6989
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_pte_range mm/memory.c:1206 [inline]
 copy_pmd_range+0x6727/0x7000 mm/memory.c:1267
 copy_pud_range mm/memory.c:1304 [inline]
 copy_p4d_range mm/memory.c:1328 [inline]
 copy_page_range+0xc46/0x1270 mm/memory.c:1416
 dup_mmap+0xf57/0x1ac0 mm/mmap.c:1838
 dup_mm kernel/fork.c:1477 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1529
 copy_process+0x1706/0x3c00 kernel/fork.c:2169
 kernel_clone+0x224/0x7f0 kernel/fork.c:2599
 __do_sys_clone kernel/fork.c:2742 [inline]
 __se_sys_clone kernel/fork.c:2726 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2726
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4dd9f85193
RSP: 002b:00007fff7f7ad3b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4dd9f85193
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555897ba7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 00000000001a04e1 R15: 00007fff7f7ad550
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g73709 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=127374
rcu: rcu_preempt kthread starved for 10500 jiffies! g73709 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27192 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 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:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 19981 Comm: modprobe Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #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:1778 [inline]
RIP: 0010:__hrtimer_run_queues+0x644/0xc60 kernel/time/hrtimer.c:1825
Code: 0f b6 04 28 84 c0 4c 8b 74 24 58 0f 85 43 02 00 00 48 8b 44 24 28 0f b6 18 89 de 83 e6 01 31 ff e8 61 ef 11 00 83 e3 01 75 20 <e8> 57 ec 11 00 4c 89 e7 4c 89 fe 31 d2 e8 3a 2e 00 00 eb 11 e8 43
RSP: 0018:ffffc90000007d40 EFLAGS: 00000046
RAX: ffffffff81ae612f RBX: 0000000000000000 RCX: 0000000000010000
RDX: ffff888027993c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007e90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f84 R12: ffff88807e238340
R13: dffffc0000000000 R14: ffff8880b8627c18 R15: ffff8880b8627bc0
FS:  0000000000000000(0000) GS:ffff888125c84000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005ff46000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:tomoyo_realpath_from_path+0x454/0x5d0 security/tomoyo/realpath.c:276
Code: fd eb 13 e8 4e bd 46 fd eb 0c e8 47 bd 46 fd eb 0f e8 40 bd 46 fd 49 bc 00 00 00 00 00 fc ff df 48 8b 2c 24 49 83 fd ea 74 13 <e8> 27 bd 46 fd 49 81 fd 01 f0 ff ff 73 41 e9 1e 01 00 00 e8 14 bd
RSP: 0018:ffffc900050cfa40 EFLAGS: 00000293
RAX: ffffffff84799050 RBX: 0000000000001000 RCX: ffff888027993c00
RDX: 0000000000000000 RSI: 0000000000008000 RDI: 0000000000004000
RBP: ffff88804c400000 R08: ffff88804c400fe5 R09: 0000000000000fe5
R10: ffff88804c400fe5 R11: 0000000000000fe5 R12: dffffc0000000000
R13: ffff88804c400fe5 R14: ffff88804c400000 R15: 0000000000000fff
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x213/0x4b0 security/tomoyo/file.c:822
 security_inode_getattr+0x12f/0x330 security/security.c:2377
 vfs_getattr fs/stat.c:259 [inline]
 vfs_fstat fs/stat.c:281 [inline]
 __do_sys_newfstat fs/stat.c:555 [inline]
 __se_sys_newfstat fs/stat.c:550 [inline]
 __x64_sys_newfstat+0xfc/0x200 fs/stat.c:550
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f68c26aee87
Code: 00 00 00 b8 15 00 00 00 0f 05 48 3d 00 f0 ff ff 77 01 c3 f7 d8 89 05 28 44 01 00 b8 ff ff ff ff c3 66 90 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 f7 d8 89 05 08 44 01 00 b8 ff ff ff ff
RSP: 002b:00007ffd7ab79148 EFLAGS: 00000246 ORIG_RAX: 0000000000000005
RAX: ffffffffffffffda RBX: 00007f68c26830c0 RCX: 00007f68c26aee87
RDX: 0000000000000000 RSI: 00007ffd7ab791e0 RDI: 0000000000000000
RBP: 00007ffd7ab792a0 R08: 00007f68c2684a90 R09: 00007f68c26830c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffd7ab79340 R15: 0000000000000000
 </TASK>