syzbot has found a reproducer for the following issue on: HEAD commit: 3aaf0a27 Merge tag 'clang-format-for-linux-v5.11-rc7' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15d87364d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7edd79f26f7c0c3 dashboard link: https://syzkaller.appspot.com/bug?extid=6a137efd811917e8b53c syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10df828cd00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c4f2f8d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6a137efd811917e8b53c@xxxxxxxxxxxxxxxxxxxxxxxxx Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. executing program executing program BUG: memory leak unreferenced object 0xffff888110f47600 (size 232): comm "kworker/u4:1", pid 8442, jiffies 4294942490 (age 13.540s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 60 2a 04 01 81 88 ff ff 80 2d 37 0f 81 88 ff ff `*.......-7..... backtrace: [<000000007ea4ba2d>] kmem_cache_zalloc include/linux/slab.h:672 [inline] [<000000007ea4ba2d>] __alloc_file+0x1f/0xf0 fs/file_table.c:101 [<00000000cdcab42a>] alloc_empty_file+0x69/0x120 fs/file_table.c:150 [<00000000ca09bf0f>] alloc_file+0x33/0x1b0 fs/file_table.c:192 [<00000000c44b2f75>] alloc_file_pseudo+0xb2/0x140 fs/file_table.c:232 [<00000000a7d8ad8d>] create_pipe_files+0x138/0x2e0 fs/pipe.c:911 [<000000007cde2906>] umd_setup+0x33/0x220 kernel/usermode_driver.c:104 [<00000000566c5ffa>] call_usermodehelper_exec_async+0xb4/0x1b0 kernel/umh.c:101 [<00000000f26cfa20>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 BUG: memory leak unreferenced object 0xffff888113186300 (size 232): comm "kworker/u4:1", pid 8442, jiffies 4294942490 (age 13.540s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 60 2a 04 01 81 88 ff ff 00 d6 13 0f 81 88 ff ff `*.............. backtrace: [<000000007ea4ba2d>] kmem_cache_zalloc include/linux/slab.h:672 [inline] [<000000007ea4ba2d>] __alloc_file+0x1f/0xf0 fs/file_table.c:101 [<00000000cdcab42a>] alloc_empty_file+0x69/0x120 fs/file_table.c:150 [<00000000ca09bf0f>] alloc_file+0x33/0x1b0 fs/file_table.c:192 [<0000000053d2fba9>] alloc_file_clone+0x22/0x70 fs/file_table.c:244 [<000000002475fc17>] create_pipe_files+0x182/0x2e0 fs/pipe.c:922 [<00000000bcdcee57>] umd_setup+0xad/0x220 kernel/usermode_driver.c:115 [<00000000566c5ffa>] call_usermodehelper_exec_async+0xb4/0x1b0 kernel/umh.c:101 [<00000000f26cfa20>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
