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AJvYcCW7zKVlMp+EnYN5ZdeBBjiZeouLs4Z7wwRqwxsOkBgWJ/6dzJynxEGCWk4cAn3auN3vDh4D1cOAEg==@kvack.org X-Gm-Message-State: AOJu0YyfHBkPLOPsK/vS8zPobeuaQh/jPUSlOFH7gqDZwpkT9TVgMezA tPtxwPZIl0J31+GB74h2Wnmp4jxL7Kt8ytngtGx3KDEZVx4Meg7z6+j9iyzOzBkm2x0z9zUhQxO GyLivzLXL1IJNNUal4ouCbKi1qPcXSzinkqzYsFrrYQOAb1Eoh08Yq2mDYlI= X-Google-Smtp-Source: AGHT+IETLjeI/x8GwhUVFXFmfmPQHqPDpYi1GGTA+t9fdtaMjicjJgVaHVeU3qHPXdbsIoFk4Oq2wWnhk84fuHUA8K3vF6i+SvhD MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1aa1:b0:3dd:fad4:7c61 with SMTP id e9e14a558f8ab-3de38c5eed6mr178893695ab.8.1750740087937; Mon, 23 Jun 2025 21:41:27 -0700 (PDT) Date: Mon, 23 Jun 2025 21:41:27 -0700 In-Reply-To: <68251338.a00a0220.104b28.0015.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <685a2c77.a00a0220.2e5631.0054.GAE@google.com> Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in vms_gather_munmap_vmas From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, pasha.tatashin@soleen.com, pfalcato@suse.de, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: DDB7240006 X-Stat-Signature: n6nsf67a81fx35un436fkf7gapppryzo X-Rspam-User: X-HE-Tag: 1750740088-114899 X-HE-Meta: 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/zokb7xsKtI9tPoUWUUOW3o3jbYG+RwpQR/1XawVi0V2NuhO/d3uB7t0TKchsonWem2pB7W3bPZlDzKPlsewzaiNOwIoKwkmicUVD4LNv2CYQ9c96rHlXhgSDrjTbrf9cNfozjo3yzwUrrlZ7KRT6fJWaO/0c6kwfR7ncKBby1egiw6/VOVq03OYBlowzcztvWNn1/dYhap4Qwf1OyQbvHC9ILxrlQ9tG6MsTVJ2GRqXTcfcF185ACG1SUcl1SJ+sUslZlEqTlPs/HylBF6sk8FnZyYjkWD+WLxTsZY9U0DJOikdgBdAA0z12X9M5+27NvPQtzbynjFhgQBShd7Cf1A3l3gcJ1gzrvlaaZPYvBIrDB9GlBsdKwWjSSQZGnaa 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: syzbot has found a reproducer for the following issue on: HEAD commit: 86731a2a651e Linux 6.16-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14c41b0c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=28cc6f051378bb16 dashboard link: https://syzkaller.appspot.com/bug?extid=701fc0fcde2b68c4bf59 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e5e182580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4323a61a1fcd/disk-86731a2a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/646a4fb19be1/vmlinux-86731a2a.xz kernel image: https://storage.googleapis.com/syzbot-assets/4235bfd16a36/bzImage-86731a2a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+701fc0fcde2b68c4bf59@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=095c/1/0x4000000000000000 softirq=18291/18292 fqs=1 rcu: (detected by 1, t=10504 jiffies, g=11509, q=2130 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6072 Comm: modprobe Not tainted 6.16.0-rc3-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__lock_acquire+0x80c/0xd20 kernel/locking/lockdep.c:-1 Code: d2 e9 c4 00 00 00 48 c7 c7 70 02 01 8e 48 89 de e8 39 98 51 03 eb c2 44 89 e0 25 ff 1f 00 00 41 c1 ec 03 41 81 e4 00 60 00 00 <41> 09 c4 4c 89 f9 48 c1 e9 20 89 ca c1 c2 04 41 29 cc 44 31 e2 44 RSP: 0018:ffffc90000007b30 EFLAGS: 00000046 RAX: 000000000000090a RBX: 0000000000000001 RCX: ffffffffffffffff RDX: 00000000ffffc000 RSI: ffff88802f5fc718 RDI: ffff88802f5fbc00 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff897ed7f4 R10: dffffc0000000000 R11: ffffffff897ed730 R12: 0000000000000000 R13: ffff88802f5fc6f0 R14: ffff88802f5fc718 R15: ffffffffffffffff FS: 0000000000000000(0000) GS:ffff888125c85000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd5919b74e8 CR3: 0000000073704000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xc4/0xc90 net/sched/sch_taprio.c:924 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x529/0xc60 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:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline] RIP: 0010:lock_acquire+0xcd/0x360 kernel/locking/lockdep.c:5867 Code: 0f 85 eb 00 00 00 65 48 8b 04 25 08 b0 99 92 83 b8 ec 0a 00 00 00 0f 85 d5 00 00 00 48 c7 44 24 30 00 00 00 00 9c 8f 44 24 30 <4c> 89 74 24 10 4d 89 fe 4c 8b 7c 24 30 fa 48 c7 c7 f0 21 98 8d e8 RSP: 0018:ffffc90003abecd8 EFLAGS: 00000246 RAX: ffff88802f5fbc00 RBX: 0000000000000000 RCX: 48d8de1ae89d0f00 RDX: 0000000000000000 RSI: ffffffff81728b12 RDI: 1ffffffff1c27dcc RBP: ffffffff81728af5 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90003abee98 R11: ffffffff81ace5b0 R12: 0000000000000002 R13: ffffffff8e13ee60 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] kmem_cache_alloc_bulk_noprof+0x4e0/0x790 mm/slub.c:5374 mt_alloc_bulk lib/maple_tree.c:181 [inline] mas_alloc_nodes+0x447/0x8e0 lib/maple_tree.c:1271 mas_node_count_gfp lib/maple_tree.c:1331 [inline] mas_preallocate+0x39e/0x6b0 lib/maple_tree.c:5532 vma_iter_prealloc mm/vma.h:463 [inline] __split_vma+0x2fa/0xa00 mm/vma.c:525 vms_gather_munmap_vmas+0x4ab/0x12b0 mm/vma.c:1375 __mmap_prepare mm/vma.c:2351 [inline] __mmap_region mm/vma.c:2607 [inline] mmap_region+0x678/0x1f30 mm/vma.c:2692 do_mmap+0xc45/0x10d0 mm/mmap.c:561 vm_mmap_pgoff+0x31b/0x4c0 mm/util.c:579 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:607 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd5919e8242 Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00 RSP: 002b:00007ffc896f1078 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fd591742000 RCX: 00007fd5919e8242 RDX: 0000000000000005 RSI: 000000000014e000 RDI: 00007fd591742000 RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000028000 R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffc896f10c8 R13: 00007fd5919bc5f0 R14: 00007ffc896f18b0 R15: 00000fff912de212 rcu: rcu_preempt kthread starved for 10500 jiffies! g11509 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:27128 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+0x3fc/0x770 arch/x86/kernel/process.c:148 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: 5190 Comm: udevd Not tainted 6.16.0-rc3-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0xf69/0x12d0 kernel/smp.c:885 Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 60 78 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 0b 74 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 f0 73 0b RSP: 0018:ffffc900030a7580 EFLAGS: 00000293 RAX: ffffffff81b4d830 RBX: ffff8880b873b040 RCX: ffff88807c598000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900030a76e0 R08: ffffffff8f9fe0f7 R09: 1ffffffff1f3fc1e R10: dffffc0000000000 R11: fffffbfff1f3fc1f R12: 1ffff110170c835d R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8641ae8 FS: 00007f8df5585880(0000) GS:ffff888125d85000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e81504cef0 CR3: 000000007c958000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x6b1/0x12c0 arch/x86/mm/tlb.c:1451 dup_mmap+0x15a0/0x1ac0 mm/mmap.c:1877 dup_mm kernel/fork.c:1477 [inline] copy_mm+0x13c/0x4b0 kernel/fork.c:1529 copy_process+0x1706/0x3c00 kernel/fork.c:2169 kernel_clone+0x224/0x7f0 kernel/fork.c:2599 __do_sys_clone kernel/fork.c:2742 [inline] __se_sys_clone kernel/fork.c:2726 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2726 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8df4ef1636 Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 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 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffffac3e030 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffffac3e038 RCX: 00007f8df4ef1636 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 000055e814eac910 R08: 0000000000000000 R09: 000055e814eb4890 R10: 00007f8df5585b50 R11: 0000000000000246 R12: 00007ffffac3e3f0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.