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Wed, 26 Mar 2025 20:03:32 -0700 (PDT) Date: Wed, 26 Mar 2025 20:03:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67e4c004.050a0220.2f068f.001d.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in clone (7) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pasha.tatashin@soleen.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: B1439A000C X-Stat-Signature: bej615aprm7czumkeexbsepxwcy84dxk X-HE-Tag: 1743044613-802418 X-HE-Meta: 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 o7+iTQJJ 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 6jiWstvW eTlzw0GVw4caQo8/9RzMCB2Mm6O7qR5PUcjewy+cXRmqFmzYrBc4bvbLVfhCn5gkRg2KZh+tTEPRD9ERtt6t5h32UAlbmIQuyJhxT0ZZetYQyp+TXkvWWlVpW0WIDFlmG0E9jrqcYQIkZPmy9OD6BwEi9JQzlm0dZp1nkpJlMyJeJ7shUWlCCXN7d2raG7BgIAFJ8WHMB3RuX0UsPjHIymjoGOYmSaWZ06dxyCGSs33yJaxJJpaHl4+v0kJIMKypT7nhYfrDHx5tgZDRSHaWBkMGBElakv44iQpSNcYb6r6dI+ItqmSlFZPNxZ3ksWnVIFyJxmv/85UKKfuG4abogYdnEOuqySLyskyg/t0pLVY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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@syzkaller.appspotmail.com 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: 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 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 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: 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 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 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: 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 --- 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@googlegroups.com. 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