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Thu, 05 Nov 2026 03:10:43 -0800 (PST) Date: Thu, 05 Nov 2026 03:10:43 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aec6433.0ce67c00.35143.0002.GAE@google.com> Subject: [syzbot] [rdma?] [f2fs?] memory leak in radix_tree_insert (3) From: syzbot To: chao@kernel.org, jaegeuk@kernel.org, jgg@ziepe.ca, leon@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 6628e7d4c6b2 Linux 7.4-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=149fc6b1580000 kernel config: https://syzkaller.appspot.com/x/.config?x=441b6cc593d83cc4 dashboard link: https://syzkaller.appspot.com/bug?extid=d60be66dd00b4490fa96 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1613be2d580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bd1857dac9bc/disk-6628e7d4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0750834263ca/vmlinux-6628e7d4.xz kernel image: https://storage.googleapis.com/syzbot-assets/ef4090776a72/bzImage-6628e7d4.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/b8af1c9e7f1c/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=16e69cdd580000) AI-generated root cause summary: In lib/radix-tree.c:__radix_tree_create(), intermediate radix_tree_node (xa_node) structures are allocated and linked into parent slots as the function descends through tree levels (shift -= RADIX_TREE_MAP_SHIFT). If a subsequent node allocation fails with -ENOMEM before reaching the leaf slot, __radix_tree_create() returns the error immediately without unwinding or deleting the newly allocated empty intermediate nodes. Consequently, slot-based iterators such as radix_tree_for_each_slot() used during cleanup (e.g. in uverbs_destroy_api() -> uapi_remove_range()) never encounter the empty nodes (which have count == 0), causing those radix_tree_node objects to leak when the containing object is destroyed. full analysis: https://syzkaller.appspot.com/x/ai_root_cause?x=d60be66dd00b4490fa96 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d60be66dd00b4490fa96@syzkaller.appspotmail.com BUG: memory leak unreferenced object 0xffff88810d78f488 (size 576): comm "syz.1.32", pid 7505, jiffies 4294948085 hex dump (first 32 bytes): 0c 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 40 e5 f3 11 81 88 ff ff a0 f4 78 0d 81 88 ff ff @.........x..... backtrace (crc d8883653): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4733 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_noprof+0x35b/0x3e0 mm/slub.c:5047 radix_tree_node_alloc.constprop.0+0x81/0x1a0 lib/radix-tree.c:276 __radix_tree_create lib/radix-tree.c:624 [inline] radix_tree_insert+0x140/0x390 lib/radix-tree.c:712 uapi_add_elm drivers/infiniband/core/uverbs_uapi.c:27 [inline] uapi_add_elm drivers/infiniband/core/uverbs_uapi.c:16 [inline] uapi_add_get_elm+0x61/0x140 drivers/infiniband/core/uverbs_uapi.c:41 uapi_merge_obj_tree drivers/infiniband/core/uverbs_uapi.c:178 [inline] uapi_merge_def+0x4c4/0xb60 drivers/infiniband/core/uverbs_uapi.c:297 uapi_merge_def+0xf0/0xb60 drivers/infiniband/core/uverbs_uapi.c:286 uverbs_alloc_api+0x85/0xc50 drivers/infiniband/core/uverbs_uapi.c:659 ib_uverbs_create_uapi drivers/infiniband/core/uverbs_main.c:1140 [inline] ib_uverbs_add_one+0x1b1/0x350 drivers/infiniband/core/uverbs_main.c:1196 add_client_context+0x290/0x480 drivers/infiniband/core/device.c:755 enable_device_and_get+0x106/0x250 drivers/infiniband/core/device.c:1375 ib_register_device drivers/infiniband/core/device.c:1503 [inline] ib_register_device+0x4fe/0x7f0 drivers/infiniband/core/device.c:1441 siw_device_register drivers/infiniband/sw/siw/siw_main.c:71 [inline] siw_newlink drivers/infiniband/sw/siw/siw_main.c:433 [inline] siw_newlink+0x36a/0x3f0 drivers/infiniband/sw/siw/siw_main.c:415 nldev_newlink+0x26f/0x3e0 drivers/infiniband/core/nldev.c:1859 rdma_nl_rcv_msg+0x1ad/0x2d0 drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x175/0x1f0 drivers/infiniband/core/netlink.c:239 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x3e0/0x530 net/netlink/af_netlink.c:1361 BUG: memory leak unreferenced object 0xffff88810d792920 (size 576): comm "syz.1.32", pid 7505, jiffies 4294948085 hex dump (first 32 bytes): 06 09 00 00 00 00 00 00 88 f4 78 0d 81 88 ff ff ..........x..... 40 e5 f3 11 81 88 ff ff 38 29 79 0d 81 88 ff ff @.......8)y..... backtrace (crc 415aa5b6): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4733 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_noprof+0x35b/0x3e0 mm/slub.c:5047 radix_tree_node_alloc.constprop.0+0x81/0x1a0 lib/radix-tree.c:276 __radix_tree_create lib/radix-tree.c:624 [inline] radix_tree_insert+0x140/0x390 lib/radix-tree.c:712 uapi_add_elm drivers/infiniband/core/uverbs_uapi.c:27 [inline] uapi_add_elm drivers/infiniband/core/uverbs_uapi.c:16 [inline] uapi_add_get_elm+0x61/0x140 drivers/infiniband/core/uverbs_uapi.c:41 uapi_merge_obj_tree drivers/infiniband/core/uverbs_uapi.c:178 [inline] uapi_merge_def+0x4c4/0xb60 drivers/infiniband/core/uverbs_uapi.c:297 uapi_merge_def+0xf0/0xb60 drivers/infiniband/core/uverbs_uapi.c:286 uverbs_alloc_api+0x85/0xc50 drivers/infiniband/core/uverbs_uapi.c:659 ib_uverbs_create_uapi drivers/infiniband/core/uverbs_main.c:1140 [inline] ib_uverbs_add_one+0x1b1/0x350 drivers/infiniband/core/uverbs_main.c:1196 add_client_context+0x290/0x480 drivers/infiniband/core/device.c:755 enable_device_and_get+0x106/0x250 drivers/infiniband/core/device.c:1375 ib_register_device drivers/infiniband/core/device.c:1503 [inline] ib_register_device+0x4fe/0x7f0 drivers/infiniband/core/device.c:1441 siw_device_register drivers/infiniband/sw/siw/siw_main.c:71 [inline] siw_newlink drivers/infiniband/sw/siw/siw_main.c:433 [inline] siw_newlink+0x36a/0x3f0 drivers/infiniband/sw/siw/siw_main.c:415 nldev_newlink+0x26f/0x3e0 drivers/infiniband/core/nldev.c:1859 rdma_nl_rcv_msg+0x1ad/0x2d0 drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x175/0x1f0 drivers/infiniband/core/netlink.c:239 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x3e0/0x530 net/netlink/af_netlink.c:1361 connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF --- 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 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. 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