rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=fa54/1/0x4000000000000000 softirq=101319/101319 fqs=0
rcu: (detected by 1, t=10502 jiffies, g=116145, q=48 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 21819 Comm: syz.4.3969 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1998 [inline]
RIP: 0010:__hrtimer_run_queues+0x2b6/0x9c0 kernel/time/hrtimer.c:2096
Code: 44 14 00 49 39 ef 0f 8c fa 04 00 00 e8 03 4b 14 00 48 8b 44 24 38 0f b6 10 48 c7 c0 a4 a1 22 91 83 e0 07 83 c0 03 38 d0 7c 08 <84> d2 0f 85 08 06 00 00 8b 2d e0 8f 2c 0f 31 ff 89 ee e8 43 45 14
RSP: 0018:ffffc90000007e98 EFLAGS: 00000002
RAX: 0000000000000007 RBX: dffffc0000000000 RCX: ffffffff81f6118f
RDX: 0000000000000000 RSI: ffffffff81f6119d RDI: ffff88804df2ca80
RBP: 18c5f3ca3dfe7302 R08: 0000000000000006 R09: 1bc16d674ec82ba1
R10: 18c5f3ca3dfe7302 R11: 0000000000000000 R12: ffff888021bdb300
R13: 0000000000000001 R14: ffff8880b8428640 R15: 1bc16d674ec82ba1
FS: 0000000000000000(0000) GS:ffff888123dde000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000079000 CR3: 000000000e994000 CR4: 00000000003526f0
Call Trace:
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:write_comp_data+0x40/0x90 kernel/kcov.c:246
Code: 59 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 c3 cc cc cc cc 8b 87 24 17 00 00 85 c0 74 f1 8b 87 f8 16 00 00 <83> f8 03 75 e6 48 8b 87 00 17 00 00 8b bf fc 16 00 00 48 8b 30 48
RSP: 0018:ffffc90004007480 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffea0001a79a40 RCX: ffffffff8287033e
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88804df2ca80
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8e464f50
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000069e69067
rcu_read_lock include/linux/rcupdate.h:841 [inline]
page_table_check_clear+0x2be/0x8f0 mm/page_table_check.c:77
__page_table_check_pte_clear+0xf1/0x100 mm/page_table_check.c:155
page_table_check_pte_clear include/linux/page_table_check.h:55 [inline]
ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1263 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:879 [inline]
zap_present_folio_ptes mm/memory.c:1648 [inline]
zap_present_ptes mm/memory.c:1730 [inline]
do_zap_pte_range mm/memory.c:1832 [inline]
zap_pte_range mm/memory.c:1934 [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+0x2ccc/0x4a30 mm/memory.c:2109
unmap_vmas+0x299/0x5f0 mm/memory.c:2178
exit_mmap+0x1ef/0xa00 mm/mmap.c:1300
__mmput+0x12a/0x410 kernel/fork.c:1187
mmput+0x67/0x80 kernel/fork.c:1210
exit_mm kernel/exit.c:615 [inline]
do_exit+0x8b1/0x2ae0 kernel/exit.c:997
do_group_exit+0xd5/0x2a0 kernel/exit.c:1152
get_signal+0x1ec7/0x21e0 kernel/signal.c:3046
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x6f0 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:318 [inline]
do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c3519de99
Code: Unable to access opcode bytes at 0x7f1c3519de6f.
RSP: 002b:00007f1c32f91028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 000000000001011f RBX: 00007f1c35426270 RCX: 00007f1c3519de99
RDX: 000000000001011f RSI: 00002000000000c0 RDI: 0000000000000009
RBP: 00007f1c35233eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c35426308 R14: 00007f1c35426270 R15: 00007ffff8e62f68
rcu: rcu_preempt kthread starved for 10502 jiffies! g116145 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:28824 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 21812 Comm: syz.8.3968 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x589/0x16c0 kernel/smp.c:892
Code: b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 c9 95 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 2c 0f 00 00 8b 45 08 31
RSP: 0018:ffffc90003cbfb40 EFLAGS: 00000246
RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9000f348000
RDX: 0000000000080000 RSI: ffffffff81fdc6d7 RDI: ffff8880310b4a80
RBP: ffffe8ffffc95780 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: fffff91ffff92af1 R14: 0000000000000001 R15: ffff8880b853c880
FS: 00007f506765a6c0(0000) GS:ffff888123ede000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5067638ff8 CR3: 000000002ae28000 CR4: 00000000003526f0
Call Trace:
clock_was_set+0x61c/0x850 kernel/time/hrtimer.c:999
do_settimeofday64+0x330/0x4d0 kernel/time/timekeeping.c:1684
do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195
__do_sys_clock_settime kernel/time/posix-timers.c:1139 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1123 [inline]
__x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1123
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f506679de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f506765a028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f5066a25fa0 RCX: 00007f506679de99
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007f5066833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5066a26038 R14: 00007f5066a25fa0 R15: 00007ffc123d99f8