Hello, syzbot found the following crash on: HEAD commit: 0bf999f9 linux/pipe_fs_i.h: fix kernel-doc warnings after .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1589bd4ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=2802e33434f4f863 dashboard link: https://syzkaller.appspot.com/bug?extid=193c375dcddb4f345091 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dec65ee00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c05311e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+193c375dcddb4f345091@xxxxxxxxxxxxxxxxxxxxxxxxx executing program BUG: memory leak unreferenced object 0xffff8881166b3ac0 (size 32): comm "syz-executor191", pid 7127, jiffies 4294946216 (age 12.850s) hex dump (first 32 bytes): 00 66 73 00 00 00 00 00 00 00 00 00 00 00 00 00 .fs............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000006202a794>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] [<000000006202a794>] slab_post_alloc_hook mm/slab.h:586 [inline] [<000000006202a794>] slab_alloc mm/slab.c:3320 [inline] [<000000006202a794>] __do_kmalloc mm/slab.c:3654 [inline] [<000000006202a794>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3671 [<000000007e324303>] kstrdup+0x3a/0x70 mm/util.c:60 [<000000002835aac3>] nfs23_parse_monolithic fs/nfs/fs_context.c:958 [inline] [<000000002835aac3>] nfs_fs_context_parse_monolithic+0x5cf/0x8f0 fs/nfs/fs_context.c:1147 [<000000004fe3f934>] parse_monolithic_mount_data+0x37/0x40 fs/fs_context.c:679 [<00000000dccb779f>] do_new_mount fs/namespace.c:2818 [inline] [<00000000dccb779f>] do_mount+0x945/0xc80 fs/namespace.c:3107 [<000000006234487e>] __do_sys_mount fs/namespace.c:3316 [inline] [<000000006234487e>] __se_sys_mount fs/namespace.c:3293 [inline] [<000000006234487e>] __x64_sys_mount+0xc0/0x140 fs/namespace.c:3293 [<00000000d2937fdd>] do_syscall_64+0x73/0x220 arch/x86/entry/common.c:294 [<00000000fa6ba8f3>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
