rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6553/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=24305, q=866 ncpus=2)
task:modprobe        state:R  running task     stack:23528 pid:6553  tgid:6553  ppid:6498   task_flags:0x40000c flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:debug_lockdep_rcu_enabled+0x0/0x40 kernel/rcu/update.c:319
Code: 48 8d 3d 13 f8 89 04 48 c7 c6 c1 64 21 8e 67 48 0f b9 3a 90 eb ca cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 31 c0 83 3d c3 63 86 04 00 74 1d 83 3d 9a 95 86 04 00
RSP: 0018:ffffc90003c0f5d8 EFLAGS: 00000286
RAX: 0000000080000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: ffffc90003c0f8d0 R08: ffff888071067303 R09: 1ffff1100e20ce60
R10: dffffc0000000000 R11: ffffed100e20ce61 R12: dffffc0000000000
R13: 00007fe57cfcd000 R14: 0000000000000000 R15: ffff888031f81f01
 rcu_read_unlock include/linux/rcupdate.h:869 [inline]
 pte_unmap include/linux/pgtable.h:117 [inline]
 zap_pte_range mm/memory.c:1964 [inline]
 zap_pmd_range mm/memory.c:2020 [inline]
 zap_pud_range mm/memory.c:2048 [inline]
 zap_p4d_range mm/memory.c:2069 [inline]
 __zap_vma_range+0x4089/0x4f10 mm/memory.c:2109
 unmap_vmas+0x390/0x550 mm/memory.c:2178
 exit_mmap+0x293/0x9f0 mm/mmap.c:1300
 __mmput+0x118/0x420 kernel/fork.c:1187
 exit_mm+0x221/0x2d0 kernel/exit.c:615
 do_exit+0x6cd/0x2360 kernel/exit.c:997
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1152
 __do_sys_exit_group kernel/exit.c:1163 [inline]
 __se_sys_exit_group kernel/exit.c:1161 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1161
 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe57d0af6c5
RSP: 002b:00007ffc810d70c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe57d1b0fe8 RCX: 00007fe57d0af6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffc810d7058 R09: 0000000000000000
R10: 00007ffc810d6ef0 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fe57d1af680 R15: 00007fe57d1b1000
 </TASK>
rcu: rcu_preempt kthread starved for 10537 jiffies! g24305 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:28192 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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: 6560 Comm: syz.4.33 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:restore_sigcontext arch/x86/kernel/signal_64.c:54 [inline]
RIP: 0010:__ia32_sys_rt_sigreturn+0x2fb/0x8c0 arch/x86/kernel/signal_64.c:268
Code: e8 ca a2 5d 00 48 8b 7c 24 08 e9 3d ff ff ff 48 8d bc 24 80 00 00 00 49 bc 00 00 00 00 00 fc ff df 4b c7 44 27 04 00 00 00 00 <4b> c7 44 27 0c 00 00 00 00 4b c7 44 27 14 00 00 00 00 4b c7 44 27
RSP: 0018:ffffc90003c4fca0 EFLAGS: 00000246
RAX: ffffffff81696f99 RBX: 1ffff92000789ffc RCX: 0000000000000000
RDX: ffff888029e59f00 RSI: 0000000000000000 RDI: ffffc90003c4fd20
RBP: ffffc90003c4fee0 R08: ffffc90003c4fc17 R09: 1ffff92000789f82
R10: dffffc0000000000 R11: fffff52000789f83 R12: dffffc0000000000
R13: 0000000000000000 R14: 00007faeefef2b38 R15: 1ffff92000789fa0
FS:  00007faeefef36c0(0000) GS:ffff88812504b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fda5b5e8640 CR3: 0000000029307000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faeeef3c319
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007faeefef2b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007faeef205fa8 RCX: 00007faeeef3c319
RDX: 00007faeefef2b40 RSI: 00007faeefef2c70 RDI: 0000000000000011
RBP: 00007faeef205fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faeef206038 R14: 00007fff736fc5b0 R15: 00007fff736fc698
 </TASK>