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Sat, 21 Jun 2025 08:44:21 -0700 (PDT) Date: Sat, 21 Jun 2025 08:44:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6856d355.a00a0220.137b3.007d.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in exit_to_user_mode_loop From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 9468680009 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: amxy5851ocqk5k75znj8wgkh1j8k914n X-HE-Tag: 1750520662-864161 X-HE-Meta: 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 +bV7WWMs 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 73RHuTK3 fRUHKLl8ONxmnVb0CguAq7DYRppB2sFEMOX1H3iMdV+qyjvf27NbTAezKT8rW5goCxWRE97UbVdstDWZgzMTAyhBT88nUJyJ8kC5J3HNvoCg8ykN+PLesDN0MJf4bwG1Wa56cJd4nTBmNI7mzD2WRUXY+cxouDXQEVabnzonX9oaadKY7l2JyUOxqRTG7ig+lWIN/764fzvjsi/u8fjK+YIWKb1lpPU+1a1tqMbXDXAdBl/ay3tSbTmqi/LsRZ9dcuIZrog6IT/qEQ+nP3NWLERqVIsqSNf4tn5KRmY4G9Hq8+a6t24jC/4Z2kUbB/6XJ5tJs+uyJQGPpab6wucl3oJB+DKu7dKUwSyNc7b4bf7CrGA8xICxs/ukD7oFBPs4qxjEfIGuuDmOLyvo6CLi/ejng39tIpx930m2eGwg8zqJFOAHToAPr5Rl7WxBbaJU 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: 52da431bf03b Merge tag 'libnvdimm-fixes-6.16-rc3' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15caf50c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6a237c32900fc479 dashboard link: https://syzkaller.appspot.com/bug?extid=2642f347f7309b4880dc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/97afcc470d39/disk-52da431b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dc0ebacae4ba/vmlinux-52da431b.xz kernel image: https://storage.googleapis.com/syzbot-assets/85dd67feecea/bzImage-52da431b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2642f347f7309b4880dc@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=1c34/1/0x4000000000000000 softirq=161556/161556 fqs=0 rcu: (detected by 0, t=10506 jiffies, g=161353, q=257 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3068 Comm: syz.2.12969 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:89 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0xa5/0x2c0 mm/kasan/generic.c:189 Code: 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 41 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 0f 85 de 01 00 00 <49> ff c3 48 ff c3 75 ee e9 21 01 00 00 44 89 dd 83 e5 07 0f 84 b5 RSP: 0018:ffffc90000a08b70 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff819ed95d RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff99d17f20 RBP: ffffc90000a08c78 R08: ffffffff99d17f23 R09: 1ffffffff33a2fe4 R10: dffffc0000000000 R11: fffffbfff33a2fe4 R12: 0000000000000001 R13: ffff88805f06d5e8 R14: fffffbfff33a2fe5 R15: 1ffffffff33a2fe4 FS: 0000000000000000(0000) GS:ffff888125d85000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6119f32f98 CR3: 000000000df38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] queued_spin_is_locked include/asm-generic/qspinlock.h:57 [inline] debug_spin_unlock kernel/locking/spinlock_debug.c:101 [inline] do_raw_spin_unlock+0x4d/0x240 kernel/locking/spinlock_debug.c:141 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock_irqrestore+0x78/0x110 kernel/locking/spinlock.c:194 debug_object_activate+0x2e2/0x420 lib/debugobjects.c:836 debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline] debug_activate kernel/time/hrtimer.c:484 [inline] enqueue_hrtimer+0x30/0x3a0 kernel/time/hrtimer.c:1088 __run_hrtimer kernel/time/hrtimer.c:1778 [inline] __hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5948 Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 89 73 3a 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc900047272d0 EFLAGS: 00000206 RAX: fafe2bb1bb0f2700 RBX: 0000000000000001 RCX: fafe2bb1bb0f2700 RDX: 0000000000000000 RSI: ffffffff8db5a486 RDI: ffffffff8be1b800 RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff822cc8f7 R10: dffffc0000000000 R11: fffff940002e65a9 R12: 0000000000000246 R13: ffff888030045a00 R14: ffffffff8e13eda0 R15: 0000000000000001 lookup_page_ext mm/page_ext.c:254 [inline] page_ext_lookup+0xe7/0x180 mm/page_ext.c:520 page_ext_iter_begin include/linux/page_ext.h:132 [inline] page_table_check_clear+0x278/0x700 mm/page_table_check.c:78 ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline] get_and_clear_full_ptes include/linux/pgtable.h:714 [inline] zap_present_folio_ptes mm/memory.c:1505 [inline] zap_present_ptes mm/memory.c:1590 [inline] do_zap_pte_range mm/memory.c:1691 [inline] zap_pte_range mm/memory.c:1735 [inline] zap_pmd_range mm/memory.c:1827 [inline] zap_pud_range mm/memory.c:1856 [inline] zap_p4d_range mm/memory.c:1877 [inline] unmap_page_range+0x3249/0x41c0 mm/memory.c:1898 unmap_single_vma mm/memory.c:1941 [inline] unmap_vmas+0x399/0x580 mm/memory.c:1985 exit_mmap+0x248/0xb50 mm/mmap.c:1284 __mmput+0x118/0x420 kernel/fork.c:1121 exit_mm+0x1da/0x2c0 kernel/exit.c:581 do_exit+0x640/0x22e0 kernel/exit.c:943 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104 get_signal+0x125e/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f611918e929 Code: Unable to access opcode bytes at 0x7f611918e8ff. RSP: 002b:00007f6119f330e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f61193b5fa8 RCX: 00007f611918e929 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f61193b5fa8 RBP: 00007f61193b5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f61193b5fac R13: 0000000000000000 R14: 00007fff0affa0b0 R15: 00007fff0affa198 rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g161353 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=69309 rcu: rcu_preempt kthread starved for 10506 jiffies! g161353 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:26888 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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