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Wed, 14 May 2025 15:03:36 -0700 (PDT) Date: Wed, 14 May 2025 15:03:36 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68251338.a00a0220.104b28.0015.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in vms_gather_munmap_vmas 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-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 13FD780005 X-Stat-Signature: iehwrtaowgzcu8usqg7m18mxo8ojy16t X-Rspam-User: X-HE-Tag: 1747260216-245331 X-HE-Meta: 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 B95Fig2A 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 QySedC6z U6fIxkBEXnw0epJF1Fbcs0lQ70Zgl3Ej8fcfwpk3ogOc8FBfhiOZr6BOtHggtmR9oV3/MM93/68mI3WlRrOs26jDwsHBhAdonuduiXSsguWKdX5AevKDNnVm80DlvUt16AGG5EpQ0bvwD7WuKf7VRk2p1agyXTHDVFm0uJj+6n2AV1o8DryANatfaWvtcKNiOUBPrKwP5uVvR05ulJq5BeQaOYfsRaH60qDxFbgT7FaqCoPMdgfziv32cYNKWemSN9ygbQGW3WQaDtWPwX7754s+1dUiRwrmQdbeEU87hST38n6dBuj8doc3f8DIfIUR8CVEq8X2Zj+0TAdTIZz20LyeDfE5d9ASwp0AIKdiIueW3RSnHgxvU+Vsh9QNTIOjs7sy9Aqv5ut1Tqjcg8rr3VIctHQ7hz/1 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: 82f2b0b97b36 Linux 6.15-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=129f4cd4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=714342dbe6af3a03 dashboard link: https://syzkaller.appspot.com/bug?extid=701fc0fcde2b68c4bf59 compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7a2b57ba9ad2/disk-82f2b0b9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2dabda38719c/vmlinux-82f2b0b9.xz kernel image: https://storage.googleapis.com/syzbot-assets/5e734acfa53b/bzImage-82f2b0b9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+701fc0fcde2b68c4bf59@syzkaller.appspotmail.com bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5179/1:b..l P7230/1:b..l rcu: (detected by 0, t=10503 jiffies, g=21217, q=525 ncpus=2) task:sed state:R running task stack:24280 pid:7230 tgid:7230 ppid:7226 task_flags:0x400000 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x168f/0x4c70 kernel/sched/core.c:6767 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7090 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5870 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 6b 32 d4 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90003656f70 EFLAGS: 00000206 RAX: 983870c225f6e200 RBX: 0000000000000000 RCX: 983870c225f6e200 RDX: 0000000000000000 RSI: ffffffff8d9219f6 RDI: ffffffff8bc0ffa0 RBP: ffffffff822a7ffa R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff822a7ffa R12: 0000000000000002 R13: ffffffff8df3d860 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] __page_table_check_zero+0xd7/0x510 mm/page_table_check.c:138 page_table_check_free include/linux/page_table_check.h:41 [inline] free_pages_prepare mm/page_alloc.c:1263 [inline] __free_frozen_pages+0xb19/0xcd0 mm/page_alloc.c:2725 discard_slab mm/slub.c:2716 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3185 put_cpu_partial+0x17c/0x250 mm/slub.c:3260 __slab_free+0x2f7/0x400 mm/slub.c:4512 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203 mt_alloc_one lib/maple_tree.c:176 [inline] mas_alloc_nodes+0x2e9/0x8e0 lib/maple_tree.c:1249 mas_node_count_gfp lib/maple_tree.c:1331 [inline] mas_preallocate+0x542/0x8b0 lib/maple_tree.c:5501 vma_iter_prealloc mm/vma.h:409 [inline] __split_vma+0x315/0x9b0 mm/vma.c:490 vms_gather_munmap_vmas+0x4ab/0x12b0 mm/vma.c:1336 __mmap_prepare mm/vma.c:2303 [inline] __mmap_region mm/vma.c:2506 [inline] mmap_region+0x5f5/0x1e50 mm/vma.c:2597 do_mmap+0xc68/0x1100 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+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f60fe10d242 RSP: 002b:00007fff93f23708 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f60fdde1000 RCX: 00007f60fe10d242 RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f60fdde1000 RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000006000 R10: 0000000000000812 R11: 0000000000000206 R12: 00007fff93f237c8 R13: 00007f60fdde40c0 R14: 00007fff93f23b40 R15: 00000ffff27e46e4 task:klogd state:R running task stack:24280 pid:5179 tgid:5179 ppid:1 task_flags:0x400100 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x168f/0x4c70 kernel/sched/core.c:6767 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7090 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5870 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 6b 32 d4 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90002ed7198 EFLAGS: 00000206 RAX: 59b6fbc4dbd42200 RBX: 0000000000000000 RCX: 59b6fbc4dbd42200 RDX: 0000000000000000 RSI: ffffffff8d9219f6 RDI: ffffffff8bc0ffa0 RBP: ffffffff8171a9f5 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8171a9f5 R12: 0000000000000002 R13: ffffffff8df3d860 R14: 0000000000000000 R15: 0000000000000246 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 save_stack+0xf7/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xb05/0xcd0 mm/page_alloc.c:2725 discard_slab mm/slub.c:2716 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3185 put_cpu_partial+0x17c/0x250 mm/slub.c:3260 __slab_free+0x2f7/0x400 mm/slub.c:4512 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4248 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:658 alloc_skb include/linux/skbuff.h:1340 [inline] alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6639 sock_alloc_send_pskb+0x857/0x990 net/core/sock.c:2954 unix_dgram_sendmsg+0x5c2/0x17c0 net/unix/af_unix.c:2007 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 __sys_sendto+0x3bd/0x520 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f56ee8c6407 RSP: 002b:00007ffd8756dbe0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f56ee776c80 RCX: 00007f56ee8c6407 RDX: 00000000000000a0 RSI: 00007ffd8756dd20 RDI: 0000000000000003 RBP: 00007ffd8756e150 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000202 R12: 00007ffd8756e168 R13: 00007ffd8756dd20 R14: 0000000000000085 R15: 00007ffd8756dd20 net_ratelimit: 18139 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) --- 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