rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13529/1:b..l P13516/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=70117, q=351 ncpus=2)
task:syz.5.1620      state:R  running task     stack:25896 pid:13516 ppid:8490   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 6c 26 04 0d 48 89 de 5b e9 f3 6f 57 00 cc cc cc <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d c0 89 7c 7e 65 8b 15 c1 89 7c
RSP: 0018:ffffc9001218f590 EFLAGS: 00000286
RAX: ffffffff813b54d7 RBX: 0000000080000000 RCX: 0000000000000000
RDX: ffff888021361e00 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9001218f980 R08: ffff888021361e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc9001218f668
R13: dffffc0000000000 R14: ffffc9001218f9c8 R15: ffffc9001218f678
 unwind_next_frame+0x1d24/0x2970 arch/x86/kernel/unwind_orc.c:672
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 save_stack+0x125/0x230 mm/page_owner.c:128
 __reset_page_owner+0x4e/0x190 mm/page_owner.c:149
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 mm_free_pgd kernel/fork.c:811 [inline]
 __mmdrop+0xb4/0x3d0 kernel/fork.c:927
 exit_mm+0x24a/0x350 kernel/exit.c:570
 do_exit+0x8dd/0x2460 kernel/exit.c:871
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1026
 get_signal+0x12fc/0x13f0 kernel/signal.c:2902
 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f59d9f9caeb
RSP: 002b:00007f59daecef00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000005 RCX: 00007f59d9f9caeb
RDX: 00007f59daecffd0 RSI: 0000000080085502 RDI: 0000000000000005
RBP: 00007f59daecffd0 R08: 0000000000000040 R09: 00007f59daecefc8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000000000012 R15: 00007f59da05125f
 </TASK>
task:modprobe        state:R  running task     stack:23816 pid:13529 ppid:12540  flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
RIP: 0010:kasan_check_range+0x1b9/0x290 mm/kasan/generic.c:-1
Code: f4 49 01 dc 4d 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 0e 41 80 3b 00 75 6b 49 ff c3 49 ff cc 75 f2 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 45 84 ff 0f 85 91 00 00 00 41 f7
RSP: 0018:ffffc90012207768 EFLAGS: 00000297
RAX: ffffffff8a756b01 RBX: ffffffffffffffff RCX: ffffffff8a756b8f
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff976ed220
RBP: ffffc90012207950 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2edda44 R12: fffffbfff2edda44
R13: dffffc0000000000 R14: fffffbfff2edda45 R15: 1ffffffff2edda44
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline]
 mt_validate+0x2cf/0x4400 lib/maple_tree.c:7223
 validate_mm+0xc6/0x450 mm/mmap.c:288
 __split_vma+0xad4/0xc60 mm/mmap.c:2425
 mprotect_fixup+0xab7/0xca0 mm/mprotect.c:650
 do_mprotect_pkey+0x7c2/0xcb0 mm/mprotect.c:819
 __do_sys_mprotect mm/mprotect.c:840 [inline]
 __se_sys_mprotect mm/mprotect.c:837 [inline]
 __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:837
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f176eae82c7
RSP: 002b:00007ffc202f9f88 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f176eac5050 RCX: 00007f176eae82c7
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007f176e80f000
RBP: 00007ffc202fa250 R08: 0000000000000000 R09: 00007f176e861870
R10: 00007f176eac5050 R11: 0000000000000206 R12: 0000000000000010
R13: 0000021dcbe94bb5 R14: 0000000000000000 R15: 00007f176eafc310
 </TASK>
rcu: rcu_preempt kthread starved for 10578 jiffies! g70117 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:27656 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </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 PID: 0 Comm: swapper/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:106 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0xac/0x290 mm/kasan/generic.c:187
Code: 4c 01 fb 41 80 3b 00 0f 85 8d 01 00 00 49 ff c3 48 ff c3 75 ee e9 1d 01 00 00 44 89 dd 83 e5 07 0f 84 b5 00 00 00 41 80 3b 00 <4d> 89 dc 0f 85 9e 01 00 00 83 fd 07 0f 84 8d 00 00 00 41 80 3c 1f
RSP: 0018:ffffc90000007c28 EFLAGS: 00000046
RAX: ffffffff81779001 RBX: dffffc0000000001 RCX: ffffffff8177b863
RDX: 0000000000000001 RSI: 0000000000000128 RDI: ffffffff8d14bcf8
RBP: 0000000000000007 R08: ffffffff8d14be1f R09: 1ffffffff1a297c3
R10: dffffc0000000000 R11: fffffbfff1a2979f R12: 0000000000000025
R13: dffffc0000000000 R14: fffffbfff1a297c4 R15: 1ffffffff1a2979f
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b35676000 CR3: 000000002299b000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 timekeeping_advance+0x7c3/0xac0 kernel/time/timekeeping.c:2216
 update_wall_time+0x10/0x30 kernel/time/timekeeping.c:2231
 tick_sched_do_timer kernel/time/tick-sched.c:221 [inline]
 tick_sched_timer+0x18f/0x580 kernel/time/tick-sched.c:1485
 __run_hrtimer kernel/time/hrtimer.c:1754 [inline]
 __hrtimer_run_queues+0x4e1/0xc40 kernel/time/hrtimer.c:1818
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1880
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: b8 1f 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 43 24 40 00 fb f4 <c3> 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2e 41 89 de 80
RSP: 0018:ffffffff8ce07d80 EFLAGS: 000002c2
RAX: 6d3a7116457d2f00 RBX: ffffffff8162aea1 RCX: 6d3a7116457d2f00
RDX: 0000000000000001 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9a20
RBP: ffffffff8ce07eb8 R08: ffff8880b8e36b2b R09: 1ffff110171c6d65
R10: dffffc0000000000 R11: ffffed10171c6d66 R12: 1ffffffff19c0fbc
R13: dffffc0000000000 R14: 1ffffffff19d2688 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:753
 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:178 [inline]
 do_idle+0x221/0x590 kernel/sched/idle.c:302
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
 rest_init+0x2e2/0x300 init/main.c:744
 arch_call_rest_init+0xe/0x10 init/main.c:840
 start_kernel+0x459/0x4e0 init/main.c:1085
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
 x86_64_start_kernel+0x60/0x60 arch/x86/kernel/head64.c:536
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>