rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P20537/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=104801, q=264 ncpus=2)
task:syz.2.3336      state:R  running task     stack:24664 pid:20537 tgid:20536 ppid:19536  task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7140
 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x7f/0xb0 kernel/rcu/tree.c:752
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x5f/0x340 kernel/locking/lockdep.c:5831
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 count_memcg_events_mm include/linux/memcontrol.h:982 [inline]
 count_memcg_event_mm+0x3d/0x260 include/linux/memcontrol.h:992
 mm_account_fault mm/memory.c:6445 [inline]
 handle_mm_fault+0x2b0b/0x32b0 mm/memory.c:6606
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f612fe509e6
RSP: 002b:00007f6130e234a0 EFLAGS: 00010206
RAX: 0000000000c1a001 RBX: 00007f6130e23540 RCX: 000000000000000e
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f6130e235e0
RBP: 0000000000000102 R08: 00007f6125c00000 R09: 0000000000c1a000
R10: 0000000000000000 R11: 00007f6130e23550 R12: 0000000000000001
R13: 00007f613002fc40 R14: 0000000000000000 R15: 00007f6130e235e0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g104801 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=78647
rcu: rcu_preempt kthread starved for 10502 jiffies! g104801 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27104 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 20533 Comm: syz.8.3335 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:memset+0xf/0x20 arch/x86/lib/memset_64.S:38
Code: 44 88 1f e9 2e 8b b6 f5 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 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 e9 02 8b b6 f5 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a08ce8 EFLAGS: 00000002
RAX: 1ffff110098d6800 RBX: 1ffff110170e5001 RCX: 0000000000000005
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff88804c6b4313
RBP: ffff88802ed20800 R08: ffff88804c6b4317 R09: ffff88804c6b4308
R10: dffffc0000000000 R11: ffffed10098d6863 R12: ffff88804c6b4300
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88802ed20810
FS:  00007fe4089f66c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4089f5f98 CR3: 00000000297d7000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 rb_link_node include/linux/rbtree.h:91 [inline]
 rb_add_cached include/linux/rbtree.h:210 [inline]
 timerqueue_add+0x149/0x200 lib/timerqueue.c:40
 __run_hrtimer kernel/time/hrtimer.c:1794 [inline]
 __hrtimer_run_queues+0x636/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
Code: f7 e8 0d 6b 42 f6 f7 c3 00 02 00 00 74 05 e8 60 97 6c f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 44 85 34 f6 65 8b 05 4d e8 23 07 85 c0 74 18 5b 41 5e e9 1c 19
RSP: 0018:ffffc9000402fa50 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000202 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8d79207b RDI: 0000000000000001
RBP: ffff88802ed208d8 R08: ffffffff8f822277 R09: 1ffffffff1f0444e
R10: dffffc0000000000 R11: fffffbfff1f0444f R12: dffffc0000000000
R13: 3654592dcf1b0ba4 R14: ffff88802ed20888 R15: ffff88802ed208f8
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 timerfd_clock_was_set+0x1ce/0x2c0 fs/timerfd.c:111
 clock_was_set+0x73b/0x7c0 kernel/time/hrtimer.c:975
 do_adjtimex+0x228/0x310 kernel/time/timekeeping.c:2767
 do_clock_adjtime kernel/time/posix-timers.c:1161 [inline]
 __do_sys_clock_adjtime kernel/time/posix-timers.c:1173 [inline]
 __se_sys_clock_adjtime kernel/time/posix-timers.c:1164 [inline]
 __x64_sys_clock_adjtime+0x211/0x2c0 kernel/time/posix-timers.c:1164
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe40a78f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe4089f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fe40a9e6090 RCX: 00007fe40a78f749
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007fe40a813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe40a9e6128 R14: 00007fe40a9e6090 R15: 00007ffc4c62c4c8
 </TASK>