rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6290/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=8505, q=386 ncpus=2)
task:syz.2.151       state:R  running task     stack:27936 pid:6290  tgid:6290  ppid:5820   task_flags:0x40004c flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6765
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6944
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1772 [inline]
 zap_pmd_range mm/memory.c:1834 [inline]
 zap_pud_range mm/memory.c:1863 [inline]
 zap_p4d_range mm/memory.c:1884 [inline]
 unmap_page_range+0xee3/0x4390 mm/memory.c:1905
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1951
 unmap_vmas+0x22f/0x490 mm/memory.c:1995
 exit_mmap+0x1c1/0xba0 mm/mmap.c:1284
 __mmput+0x12a/0x410 kernel/fork.c:1356
 mmput+0x62/0x70 kernel/fork.c:1378
 exit_mm kernel/exit.c:570 [inline]
 do_exit+0x9ba/0x2d70 kernel/exit.c:925
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1096
 x64_sys_call+0x151f/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f373078d169
RSP: 002b:00007fff8e7cbb48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f373078d169
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff8e7cbbac R08: 000000048e7cbc3f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000011
R13: 00000000000927c0 R14: 000000000001147c R15: 00007fff8e7cbc00
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g8505 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=2779
rcu: rcu_preempt kthread starved for 10502 jiffies! g8505 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:28344 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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: 6298 Comm: syz.1.153 Not tainted 6.14.0-rc5-syzkaller-00023-gbb2281fb05e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:246
Code: cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 2f ee 49 7e <65> 8b 05 30 ee 49 7e a9 00 01 ff 00 74 1d f6 c4 01 74 67 a9 00 00
RSP: 0018:ffffc90000007d78 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff896aacc4
RDX: ffff88802f8e0000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff888028209810 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000002
R13: ffff888028209800 R14: ffff88805b6dc340 R15: ffff888028209000
FS:  00007f5a53b8e6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000003375a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 advance_sched+0x924/0xc60 net/sched/sch_taprio.c:985
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 96 dc 3c f6 48 89 df e8 ee 5b 3d f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 65 31 2e f6 65 8b 05 a6 03 aa 74 85 c0 74 16 5b
RSP: 0018:ffffc9000e93fca8 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880b862c680 RCX: 1ffffffff2dd8a73
RDX: 0000000000000000 RSI: ffffffff8b6cfb00 RDI: ffffffff8bd367a0
RBP: 0000000000000282 R08: 0000000000000001 R09: fffffbfff2dd8998
R10: ffffffff96ec4cc7 R11: 0000000000000001 R12: fc68908529c714c7
R13: 0000000000000000 R14: 0000001088993120 R15: dffffc0000000000
 clock_was_set+0x591/0x850 kernel/time/hrtimer.c:984
 do_settimeofday64+0x305/0x4c0 kernel/time/timekeeping.c:1381
 do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195
 __do_sys_clock_settime kernel/time/posix-timers.c:1135 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1119 [inline]
 __x64_sys_clock_settime+0x1bf/0x2a0 kernel/time/posix-timers.c:1119
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a52d8d169
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:00007f5a53b8e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f5a52fa5fa0 RCX: 00007f5a52d8d169
RDX: 0000000000000000 RSI: 0000400000000240 RDI: 0000000000000000
RBP: 00007f5a52e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5a52fa5fa0 R15: 00007ffe7ad77cb8
 </TASK>