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Wed, 05 Jul 2023 20:12:53 -0700 (PDT) Date: Wed, 05 Jul 2023 20:12:53 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000607ff905ffc8e477@google.com> Subject: [syzbot] [mm?] WARNING: suspicious RCU usage in mas_walk (2) 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: B5FC040014 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: tjhk61adj6qf7ytogfcan4xkp4dct7j6 X-HE-Tag: 1688613174-645380 X-HE-Meta: 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 VDu8ewMr 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 +bmFrqvh v0sIxS34+Iq/43s9jsuMcjOCV0mbLUfqsOfSBGAKDmaZxg3aad0hBTTHxPQCQPZydA7d9fDrN6JImgHtX2In5pn87Nh7Xewsbhms83cRObPcuHyWRtR0CO4m7cj0jW4KrkCvn6WsL+6xaQmaooCm46dUKlkyMiu30OOG8AarCX0J8lnEEgVcx2wKvRw+sCt289xy9tINTk9aOlpmQRlxdhAHdOdCOpTj9UtTd5CWEnlOorbBqLySeWEKfqpm/Cpskr5wAA+h3yUeyBJnOCaMDtB86MiFW56dEyflQi/oPIJltkBOqzwYKg== 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: Hello, syzbot found the following issue on: HEAD commit: a901a3568fd2 Merge tag 'iomap-6.5-merge-1' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=105632c8a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=db74cd5aa6878807 dashboard link: https://syzkaller.appspot.com/bug?extid=8645fe63c4d22c8d27b8 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3e7b15164da6/disk-a901a356.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9880c1d81d68/vmlinux-a901a356.xz kernel image: https://storage.googleapis.com/syzbot-assets/6d5b0c0d9670/bzImage-a901a356.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8645fe63c4d22c8d27b8@syzkaller.appspotmail.com SELinux: policy capability cgroup_seclabel=1 SELinux: policy capability nnp_nosuid_transition=1 SELinux: policy capability genfs_seclabel_symlinks=0 SELinux: policy capability ioctl_skip_cloexec=0 ============================= WARNING: suspicious RCU usage 6.4.0-syzkaller-10173-ga901a3568fd2 #0 Not tainted ----------------------------- lib/maple_tree.c:860 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 no locks held by init/1. stack backtrace: CPU: 1 PID: 1 Comm: init Not tainted 6.4.0-syzkaller-10173-ga901a3568fd2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x208/0x3a0 kernel/locking/lockdep.c:6719 mas_root lib/maple_tree.c:860 [inline] mas_root lib/maple_tree.c:858 [inline] mas_start lib/maple_tree.c:1402 [inline] mas_start lib/maple_tree.c:1392 [inline] mas_state_walk lib/maple_tree.c:3861 [inline] mas_walk+0x4e8/0x7c0 lib/maple_tree.c:4980 mas_find_setup lib/maple_tree.c:5924 [inline] mas_find+0x1cb/0x340 lib/maple_tree.c:5965 vma_next include/linux/mm.h:865 [inline] validate_mm+0xd2/0x470 mm/mmap.c:301 do_vmi_align_munmap+0x1199/0x1680 mm/mmap.c:2561 do_vmi_munmap+0x266/0x430 mm/mmap.c:2619 __vm_munmap+0x137/0x380 mm/mmap.c:2899 __do_sys_munmap mm/mmap.c:2916 [inline] __se_sys_munmap mm/mmap.c:2913 [inline] __x64_sys_munmap+0x62/0x80 mm/mmap.c:2913 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f36cc8e9817 Code: ff ff 76 10 48 8b 15 10 36 0d 00 f7 d8 64 89 02 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 35 0d 00 f7 d8 64 89 01 48 RSP: 002b:00007fff12a54cf8 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 000000000000001f RCX: 00007f36cc8e9817 RDX: 0000000000000000 RSI: 00000000000415ce RDI: 00007f36cc6b1000 RBP: 00005613cf216bf0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f36cc6b1000 R15: 00007f36cc72a16d ============================= WARNING: suspicious RCU usage 6.4.0-syzkaller-10173-ga901a3568fd2 #0 Not tainted ----------------------------- lib/maple_tree.c:816 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 no locks held by init/1. stack backtrace: CPU: 0 PID: 1 Comm: init Not tainted 6.4.0-syzkaller-10173-ga901a3568fd2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x208/0x3a0 kernel/locking/lockdep.c:6719 mt_slot lib/maple_tree.c:816 [inline] mt_slot lib/maple_tree.c:813 [inline] mtree_range_walk+0x602/0x940 lib/maple_tree.c:2976 mas_state_walk lib/maple_tree.c:3868 [inline] mas_walk+0x393/0x7c0 lib/maple_tree.c:4980 mas_find_setup lib/maple_tree.c:5924 [inline] mas_find+0x1cb/0x340 lib/maple_tree.c:5965 vma_next include/linux/mm.h:865 [inline] validate_mm+0xd2/0x470 mm/mmap.c:301 do_vmi_align_munmap+0x1199/0x1680 mm/mmap.c:2561 do_vmi_munmap+0x266/0x430 mm/mmap.c:2619 __vm_munmap+0x137/0x380 mm/mmap.c:2899 __do_sys_munmap mm/mmap.c:2916 [inline] __se_sys_munmap mm/mmap.c:2913 [inline] __x64_sys_munmap+0x62/0x80 mm/mmap.c:2913 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f36cc8e9817 Code: ff ff 76 10 48 8b 15 10 36 0d 00 f7 d8 64 89 02 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 35 0d 00 f7 d8 64 89 01 48 RSP: 002b:00007fff12a54cf8 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 000000000000001f RCX: 00007f36cc8e9817 RDX: 0000000000000000 RSI: 00000000000415ce RDI: 00007f36cc6b1000 RBP: 00005613cf216bf0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f36cc6b1000 R15: 00007f36cc72a16d --- 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 bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup