[syzbot] [mm?] INFO: rcu detected stall in clone (7)

From: syzbot
Date: Wed Mar 26 2025 - 23:03:44 EST

Next message: Shuah Khan: "[GIT PULL] kunit next update for Linux 6.15-rc1"
Previous message: Kent Overstreet: "Re: linux-next: build failure after merge of the bcachefs tree"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello,

syzbot found the following issue on:

HEAD commit: 2df0c02dab82 x86 boot build: make git ignore stale 'tools'..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=146cd43f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=235ad3ee10cb70e
dashboard link: https://syzkaller.appspot.com/bug?extid=adf8ed0e3c4682852da1
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3e8f0b5bed43/disk-2df0c02d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3511fa20cc2c/vmlinux-2df0c02d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0ea010ba8490/bzImage-2df0c02d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+adf8ed0e3c4682852da1@xxxxxxxxxxxxxxxxxxxxxxxxx

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=3cb4/1/0x4000000000000000 softirq=42644/42646 fqs=134
rcu: (detected by 0, t=10502 jiffies, g=30361, q=199 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5827 Comm: syz-executor Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__kasan_check_byte+0xa/0x50 mm/kasan/common.c:555
Code: e9 89 fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 41 54 49 89 f4 55 <48> 89 fd 53 e8 0d 1f 00 00 89 c3 84 c0 74 0b 89 d8 5b 5d 41 5c c3
RSP: 0018:ffffc90000a08da0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff8880b8527858 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8b603266 RDI: ffff8880b8527858
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8b603266
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 000055555862d500(0000) GS:ffff888124b54000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9983a6f98 CR3: 0000000067ad6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>
kasan_check_byte include/linux/kasan.h:399 [inline]
lock_acquire kernel/locking/lockdep.c:5840 [inline]
lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5823
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
__run_hrtimer kernel/time/hrtimer.c:1805 [inline]
__hrtimer_run_queues+0x2bc/0xad0 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x108/0x3f0 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:__page_table_check_ptes_set+0x3c/0x3e0 mm/page_table_check.c:214
Code: 55 48 bd 00 00 00 00 00 fc ff df 53 48 89 f3 48 83 ec 70 48 c7 44 24 10 b3 8a b5 41 4c 8d 7c 24 10 48 c7 44 24 18 51 b5 b9 8d <49> c1 ef 03 48 c7 44 24 20 d0 47 2a 82 49 8d 04 2f c7 00 f1 f1 f1
RSP: 0018:ffffc9000434f6e8 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff888036076b38 RCX: 0000000000000001
RDX: 80000000744e2007 RSI: ffff888036076b38 RDI: ffff888029c11e00
RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888029c11e00 R14: dffffc0000000000 R15: ffffc9000434f6f8
page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
set_ptes include/linux/pgtable.h:288 [inline]
__copy_present_ptes mm/memory.c:967 [inline]
copy_present_ptes mm/memory.c:1050 [inline]
copy_pte_range mm/memory.c:1173 [inline]
copy_pmd_range mm/memory.c:1261 [inline]
copy_pud_range mm/memory.c:1298 [inline]
copy_p4d_range mm/memory.c:1322 [inline]
copy_page_range+0x20e7/0x5790 mm/memory.c:1420
dup_mmap kernel/fork.c:748 [inline]
dup_mm kernel/fork.c:1700 [inline]
copy_mm kernel/fork.c:1752 [inline]
copy_process+0x8651/0x9130 kernel/fork.c:2396
kernel_clone+0xfc/0x960 kernel/fork.c:2811
__do_sys_clone+0xce/0x120 kernel/fork.c:2954
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0bc05839d3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffdff5ea518 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0bc05839d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055555862d7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000047f07 R15: 00007ffdff5ea6b0
</TASK>
rcu: rcu_preempt kthread starved for 7591 jiffies! g30361 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:28056 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1129/0x5c00 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6840
schedule_timeout+0x123/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2046
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2248
kthread+0x3a4/0x760 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
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 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline]
RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 50 00 3f 08 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 68 fb a0 00 fb f4 <fa> c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8e007d68 EFLAGS: 00000246
RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8b5da2f9
RDX: 0000000000000001 RSI: ffff8881442d9000 RDI: ffff8881442d9064
RBP: ffff8881442d9064 R08: 0000000000000001 R09: ffffed10170865bd
R10: ffff8880b8432deb R11: 0000000000000000 R12: ffff88801eb0f800
R13: ffffffff8f02dae0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124a54000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f58d6613c9a CR3: 0000000067ad0000 CR4: 00000000003526f0
DR0: 0000000100000000 DR1: 0000000000000040 DR2: 0000000000000000
DR3: 0000000000000009 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
</IRQ>
<TASK>
acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:701
cpuidle_enter_state+0xb2/0x500 drivers/cpuidle/cpuidle.c:268
cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:389
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:230 [inline]
do_idle+0x378/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
rest_init+0x16b/0x2b0 init/main.c:743
start_kernel+0x3e9/0x4d0 init/main.c:1099
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:513
x86_64_start_kernel+0xb0/0xc0 arch/x86/kernel/head64.c:494
common_startup_64+0x13e/0x148
</TASK>

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Next message: Shuah Khan: "[GIT PULL] kunit next update for Linux 6.15-rc1"
Previous message: Kent Overstreet: "Re: linux-next: build failure after merge of the bcachefs tree"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]