Hello, syzbot found the following issue on: HEAD commit: bdcf11de Merge tag 'riscv-for-linus-5.9-rc6' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=179e18d3900000 kernel config: https://syzkaller.appspot.com/x/.config?x=a1f3c5052e8097e9 dashboard link: https://syzkaller.appspot.com/bug?extid=9f864abad79fae7c17e1 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c33cad900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154bc6c3900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9f864abad79fae7c17e1@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: memory leak unreferenced object 0xffff88811a0d75c0 (size 32): comm "syz-executor307", pid 6444, jiffies 4294941412 (age 12.730s) hex dump (first 32 bytes): 6c 6f 6f 70 30 00 00 00 00 00 00 00 00 00 00 00 loop0........... 01 00 00 00 03 00 00 00 2b 00 00 00 00 00 00 00 ........+....... backtrace: [<00000000f89b0bef>] kstrdup+0x36/0x70 mm/util.c:60 [<000000004b68a0da>] kstrdup_const+0x35/0x60 mm/util.c:82 [<000000008eb65a51>] kvasprintf_const+0x72/0xe0 lib/kasprintf.c:48 [<00000000691729e7>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289 [<00000000dfb16dfe>] kobject_add_varg lib/kobject.c:384 [inline] [<00000000dfb16dfe>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:473 [<000000005849f02f>] ext4_register_sysfs+0x6b/0x160 fs/ext4/sysfs.c:508 [<0000000027523718>] ext4_fill_super+0x2d04/0x46c0 fs/ext4/super.c:4799 [<0000000095f0e4f3>] mount_bdev+0x1d3/0x210 fs/super.c:1417 [<00000000415e8d00>] legacy_get_tree+0x26/0x70 fs/fs_context.c:592 [<00000000bf686d81>] vfs_get_tree+0x28/0xe0 fs/super.c:1547 [<00000000fd6d6aba>] do_new_mount fs/namespace.c:2875 [inline] [<00000000fd6d6aba>] path_mount+0x90e/0xda0 fs/namespace.c:3192 [<000000008d02c1d0>] do_mount fs/namespace.c:3205 [inline] [<000000008d02c1d0>] __do_sys_mount fs/namespace.c:3413 [inline] [<000000008d02c1d0>] __se_sys_mount fs/namespace.c:3390 [inline] [<000000008d02c1d0>] __x64_sys_mount+0x140/0x190 fs/namespace.c:3390 [<000000001c682859>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 [<0000000095c447b2>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 BUG: memory leak unreferenced object 0xffff88811a0d74e0 (size 32): comm "syz-executor307", pid 6451, jiffies 4294941943 (age 7.420s) hex dump (first 32 bytes): 6c 6f 6f 70 30 00 00 00 00 00 00 00 00 00 00 00 loop0........... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000f89b0bef>] kstrdup+0x36/0x70 mm/util.c:60 [<000000004b68a0da>] kstrdup_const+0x35/0x60 mm/util.c:82 [<000000008eb65a51>] kvasprintf_const+0x72/0xe0 lib/kasprintf.c:48 [<00000000691729e7>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289 [<00000000dfb16dfe>] kobject_add_varg lib/kobject.c:384 [inline] [<00000000dfb16dfe>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:473 [<000000005849f02f>] ext4_register_sysfs+0x6b/0x160 fs/ext4/sysfs.c:508 [<0000000027523718>] ext4_fill_super+0x2d04/0x46c0 fs/ext4/super.c:4799 [<0000000095f0e4f3>] mount_bdev+0x1d3/0x210 fs/super.c:1417 [<00000000415e8d00>] legacy_get_tree+0x26/0x70 fs/fs_context.c:592 [<00000000bf686d81>] vfs_get_tree+0x28/0xe0 fs/super.c:1547 [<00000000fd6d6aba>] do_new_mount fs/namespace.c:2875 [inline] [<00000000fd6d6aba>] path_mount+0x90e/0xda0 fs/namespace.c:3192 [<000000008d02c1d0>] do_mount fs/namespace.c:3205 [inline] [<000000008d02c1d0>] __do_sys_mount fs/namespace.c:3413 [inline] [<000000008d02c1d0>] __se_sys_mount fs/namespace.c:3390 [inline] [<000000008d02c1d0>] __x64_sys_mount+0x140/0x190 fs/namespace.c:3390 [<000000001c682859>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 [<0000000095c447b2>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
