rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7338/1:b..l
rcu: 	(detected by 0, t=10508 jiffies, g=30473, q=871032 ncpus=2)
task:syz.1.501       state:R  running task     stack:25608 pid:7338  tgid:7334  ppid:5631   task_flags:0x40054c flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7277
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7599
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 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+0x20/0x40 kernel/rcu/update.c:321
Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d fb 84 94 04 00 74 1d 83 3d ca b4 94 04 00 74 14 65 48 8b 0d 48 55 af 07 <31> c0 83 b9 a4 0b 00 00 00 0f 94 c0 e9 8f fe 02 00 cc cc cc cc cc
RSP: 0018:ffffc9000a31f198 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc9000a31f258 RCX: ffff888020380000
RDX: ffffc9000a31f201 RSI: dffffc0000000000 RDI: ffffc9000a31f250
RBP: 1ffffffff2241001 R08: ffffc9000a31f5a8 R09: 0000000000000000
R10: ffffc9000a31f298 R11: fffff52001463e55 R12: ffffc9000a318000
R13: ffffffff8177f1df R14: ffffc9000a31f248 R15: ffffc9000a31f5b8
 rcu_read_unlock include/linux/rcupdate.h:878 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0x1b5d/0x2550 arch/x86/kernel/unwind_orc.c:709
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6508 [inline]
 kmem_cache_free+0x182/0x650 mm/slub.c:6635
 anon_vma_chain_free mm/rmap.c:147 [inline]
 unlink_anon_vmas+0x655/0x720 mm/rmap.c:539
 free_pgtables+0x836/0xb70 mm/memory.c:414
 exit_mmap+0x4aa/0x9f0 mm/mmap.c:1327
 __mmput+0x118/0x420 kernel/fork.c:1193
 exit_mm+0x221/0x2d0 kernel/exit.c:617
 do_exit+0x6cd/0x2360 kernel/exit.c:999
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1154
 get_signal+0x121b/0x12c0 kernel/signal.c:3051
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f737679e159
RSP: 002b:00007f73775ab028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffe00 RBX: 00007f7376a25fa0 RCX: 00007f737679e159
RDX: 000000000000001c RSI: 00002000000001c0 RDI: 000000000000000b
RBP: 00007f737683506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7376a26038 R14: 00007f7376a25fa0 R15: 00007f7376b4fa48
 </TASK>
rcu: rcu_preempt kthread starved for 9730 jiffies! g30473 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7277
 __schedule_loop kernel/sched/core.c:7354 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7369
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 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: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: bc 88 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d b3 c1 23 00 fb f4 <e9> 8c 08 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8ea07ca0 EFLAGS: 00000242
RAX: 0000000000d0ea6d RBX: ffffffff819bb25c RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e414979 RDI: ffffffff8c6da780
RBP: ffffffff8ea07d78 R08: ffff8880b8633a1b R09: 1ffff110170c6743
R10: dffffc0000000000 R11: ffffed10170c6744 R12: 0000000000000000
R13: 1ffffffff1d51e00 R14: 1ffffffff1d40f9c R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124cce000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd0d03f822f CR3: 000000007ddb6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x1cc/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 rest_init+0x378/0x3a0 init/main.c:732
 start_kernel+0x392/0x3e0 init/main.c:1190
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x157
 </TASK>