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006d021491bc7-66100718ed1mr1474718eaf.72.1768379726632; Wed, 14 Jan 2026 00:35:26 -0800 (PST) Date: Wed, 14 Jan 2026 00:35:26 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6967554e.a70a0220.1aa68e.0004.GAE@google.com> Subject: [syzbot] [io-uring?] memory leak in iovec_from_user (4) From: syzbot To: axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: b54345928fa1 Merge tag 'gfs2-for-6.19-rc6' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15f82052580000 kernel config: https://syzkaller.appspot.com/x/.config?x=87bc41cae23d2144 dashboard link: https://syzkaller.appspot.com/bug?extid=df0b387708573ad096ce compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=147ef99a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=109655fa580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/23b084ff7602/disk-b5434592.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3ecd3b0e8e34/vmlinux-b5434592.xz kernel image: https://storage.googleapis.com/syzbot-assets/b42ab3574030/bzImage-b5434592.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+df0b387708573ad096ce@syzkaller.appspotmail.com BUG: memory leak unreferenced object 0xffff88812944f000 (size 4096): comm "syz.3.20", pid 6138, jiffies 4294947163 hex dump (first 32 bytes): 40 02 00 00 00 20 00 00 03 00 00 00 00 00 00 00 @.... .......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 8ab58d7d): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kmalloc_array_noprof include/linux/slab.h:1003 [inline] iovec_from_user lib/iov_iter.c:1321 [inline] iovec_from_user+0x108/0x140 lib/iov_iter.c:1304 __import_iovec+0x71/0x350 lib/iov_iter.c:1375 io_import_vec io_uring/rw.c:99 [inline] __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120 io_import_rw_buffer io_uring/rw.c:139 [inline] io_rw_do_import io_uring/rw.c:313 [inline] io_prep_rw+0xb5/0x120 io_uring/rw.c:325 io_prep_rwv io_uring/rw.c:343 [inline] io_prep_writev+0x23/0x80 io_uring/rw.c:363 io_init_req io_uring/io_uring.c:2235 [inline] io_submit_sqe io_uring/io_uring.c:2282 [inline] io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435 __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888129450000 (size 4096): comm "syz.3.20", pid 6138, jiffies 4294947163 hex dump (first 32 bytes): 40 02 00 00 00 20 00 00 03 00 00 00 00 00 00 00 @.... .......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 8ab58d7d): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kmalloc_array_noprof include/linux/slab.h:1003 [inline] iovec_from_user lib/iov_iter.c:1321 [inline] iovec_from_user+0x108/0x140 lib/iov_iter.c:1304 __import_iovec+0x71/0x350 lib/iov_iter.c:1375 io_import_vec io_uring/rw.c:99 [inline] __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120 io_import_rw_buffer io_uring/rw.c:139 [inline] io_rw_do_import io_uring/rw.c:313 [inline] io_prep_rw+0xb5/0x120 io_uring/rw.c:325 io_prep_rwv io_uring/rw.c:343 [inline] io_prep_writev+0x23/0x80 io_uring/rw.c:363 io_init_req io_uring/io_uring.c:2235 [inline] io_submit_sqe io_uring/io_uring.c:2282 [inline] io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435 __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888129451000 (size 4096): comm "syz.3.20", pid 6138, jiffies 4294947163 hex dump (first 32 bytes): 40 02 00 00 00 20 00 00 03 00 00 00 00 00 00 00 @.... .......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 8ab58d7d): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kmalloc_array_noprof include/linux/slab.h:1003 [inline] iovec_from_user lib/iov_iter.c:1321 [inline] iovec_from_user+0x108/0x140 lib/iov_iter.c:1304 __import_iovec+0x71/0x350 lib/iov_iter.c:1375 io_import_vec io_uring/rw.c:99 [inline] __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120 io_import_rw_buffer io_uring/rw.c:139 [inline] io_rw_do_import io_uring/rw.c:313 [inline] io_prep_rw+0xb5/0x120 io_uring/rw.c:325 io_prep_rwv io_uring/rw.c:343 [inline] io_prep_writev+0x23/0x80 io_uring/rw.c:363 io_init_req io_uring/io_uring.c:2235 [inline] io_submit_sqe io_uring/io_uring.c:2282 [inline] io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435 __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888129453000 (size 4096): comm "syz.3.20", pid 6138, jiffies 4294947164 hex dump (first 32 bytes): 40 02 00 00 00 20 00 00 03 00 00 00 00 00 00 00 @.... .......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 8ab58d7d): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kmalloc_array_noprof include/linux/slab.h:1003 [inline] iovec_from_user lib/iov_iter.c:1321 [inline] iovec_from_user+0x108/0x140 lib/iov_iter.c:1304 __import_iovec+0x71/0x350 lib/iov_iter.c:1375 io_import_vec io_uring/rw.c:99 [inline] __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120 io_import_rw_buffer io_uring/rw.c:139 [inline] io_rw_do_import io_uring/rw.c:313 [inline] io_prep_rw+0xb5/0x120 io_uring/rw.c:325 io_prep_rwv io_uring/rw.c:343 [inline] io_prep_writev+0x23/0x80 io_uring/rw.c:363 io_init_req io_uring/io_uring.c:2235 [inline] io_submit_sqe io_uring/io_uring.c:2282 [inline] io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435 __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888129452000 (size 4096): comm "syz.3.20", pid 6138, jiffies 4294947164 hex dump (first 32 bytes): 40 02 00 00 00 20 00 00 03 00 00 00 00 00 00 00 @.... .......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 8ab58d7d): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kmalloc_array_noprof include/linux/slab.h:1003 [inline] iovec_from_user lib/iov_iter.c:1321 [inline] iovec_from_user+0x108/0x140 lib/iov_iter.c:1304 __import_iovec+0x71/0x350 lib/iov_iter.c:1375 io_import_vec io_uring/rw.c:99 [inline] __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120 io_import_rw_buffer io_uring/rw.c:139 [inline] io_rw_do_import io_uring/rw.c:313 [inline] io_prep_rw+0xb5/0x120 io_uring/rw.c:325 io_prep_rwv io_uring/rw.c:343 [inline] io_prep_writev+0x23/0x80 io_uring/rw.c:363 io_init_req io_uring/io_uring.c:2235 [inline] io_submit_sqe io_uring/io_uring.c:2282 [inline] io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435 __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff888129454000 (size 4096): comm "syz.3.20", pid 6138, jiffies 4294947164 hex dump (first 32 bytes): 40 02 00 00 00 20 00 00 03 00 00 00 00 00 00 00 @.... .......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 8ab58d7d): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kmalloc_array_noprof include/linux/slab.h:1003 [inline] iovec_from_user lib/iov_iter.c:1321 [inline] iovec_from_user+0x108/0x140 lib/iov_iter.c:1304 __import_iovec+0x71/0x350 lib/iov_iter.c:1375 io_import_vec io_uring/rw.c:99 [inline] __io_import_rw_buffer+0x1e2/0x260 io_uring/rw.c:120 io_import_rw_buffer io_uring/rw.c:139 [inline] io_rw_do_import io_uring/rw.c:313 [inline] io_prep_rw+0xb5/0x120 io_uring/rw.c:325 io_prep_rwv io_uring/rw.c:343 [inline] io_prep_writev+0x23/0x80 io_uring/rw.c:363 io_init_req io_uring/io_uring.c:2235 [inline] io_submit_sqe io_uring/io_uring.c:2282 [inline] io_submit_sqes+0x40d/0xf40 io_uring/io_uring.c:2435 __do_sys_io_uring_enter+0x841/0xcf0 io_uring/io_uring.c:3285 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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