Hello, syzbot found the following crash on: HEAD commit: 5a9ffb95 Merge tag '5.7-rc5-smb3-fixes' of git://git.samba.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10b72a02100000 kernel config: https://syzkaller.appspot.com/x/.config?x=f8295ae5b3f8268d dashboard link: https://syzkaller.appspot.com/bug?extid=f196caa45793d6374707 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17585b76100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12500a02100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+f196caa45793d6374707@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: memory leak unreferenced object 0xffff888117169ac0 (size 64): comm "syz-executor012", pid 6609, jiffies 4294942172 (age 13.720s) hex dump (first 32 bytes): 01 00 00 00 ff ff ff ff 00 00 00 00 00 c9 ff ff ................ d0 9a 16 17 81 88 ff ff d0 9a 16 17 81 88 ff ff ................ backtrace: [<00000000351bb234>] kmalloc include/linux/slab.h:555 [inline] [<00000000351bb234>] do_eventfd+0x35/0xf0 fs/eventfd.c:418 [<00000000c2f69a77>] __do_sys_eventfd fs/eventfd.c:443 [inline] [<00000000c2f69a77>] __se_sys_eventfd fs/eventfd.c:441 [inline] [<00000000c2f69a77>] __x64_sys_eventfd+0x14/0x20 fs/eventfd.c:441 [<0000000086d6f989>] do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295 [<000000006c5bcb63>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 BUG: memory leak unreferenced object 0xffff888117169100 (size 64): comm "syz-executor012", pid 6609, jiffies 4294942172 (age 13.720s) hex dump (first 32 bytes): e8 99 dd 00 00 c9 ff ff e8 99 dd 00 00 c9 ff ff ................ 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 ... ............ backtrace: [<00000000436d2955>] kmalloc include/linux/slab.h:555 [inline] [<00000000436d2955>] kzalloc include/linux/slab.h:669 [inline] [<00000000436d2955>] kvm_assign_ioeventfd_idx+0x4f/0x270 arch/x86/kvm/../../../virt/kvm/eventfd.c:798 [<00000000e89390cc>] kvm_assign_ioeventfd arch/x86/kvm/../../../virt/kvm/eventfd.c:934 [inline] [<00000000e89390cc>] kvm_ioeventfd+0xbb/0x194 arch/x86/kvm/../../../virt/kvm/eventfd.c:961 [<00000000ba9f6732>] kvm_vm_ioctl+0x1e6/0x1030 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3670 [<000000005da94937>] vfs_ioctl fs/ioctl.c:47 [inline] [<000000005da94937>] ksys_ioctl+0xa6/0xd0 fs/ioctl.c:771 [<00000000a583d097>] __do_sys_ioctl fs/ioctl.c:780 [inline] [<00000000a583d097>] __se_sys_ioctl fs/ioctl.c:778 [inline] [<00000000a583d097>] __x64_sys_ioctl+0x1a/0x20 fs/ioctl.c:778 [<0000000086d6f989>] do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295 [<000000006c5bcb63>] 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
