From nobody Fri Apr 29 17:52:22 2022 X-Original-To: bugs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id AC5851ABB18F for ; Fri, 29 Apr 2022 17:52:22 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Kqg6t2Fn7z4kM7 for ; Fri, 29 Apr 2022 17:52:22 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 2E55E111F5 for ; Fri, 29 Apr 2022 17:52:22 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 23THqMBc072910 for ; Fri, 29 Apr 2022 17:52:22 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 23THqMYp072909 for bugs@FreeBSD.org; Fri, 29 Apr 2022 17:52:22 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 263662] kernel panics if fuse daemon returns parent's i-number in FUSE_CREATE Date: Fri, 29 Apr 2022 17:52:22 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: Unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: rtm@lcs.mit.edu X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.mimetype attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@freebsd.org MIME-Version: 1.0 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1651254742; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=U9BXwm+wWhkIrKQm8klnUpOYoU96wiN3gEkUkMgKIS8=; b=awWlG2hh1UBxUiqWhw0IJgLoLljcVuTgWe0GH8zdIAZJ6LQf9+bBnrWfoCb29sU0oaIFjp rCmbF3huo2NWOnoM++nUfxKDA9fHbMN7yrXHGvR+aKyJvvnLwBYb11WU3BQhogSnPwp0Oz N0xvaPCdjld6xPh0QAJTJPT+1gBtUtJjNpoT2uY7h2ZGDdXmEz+VI1Lzq1MftqYhGkgNRO 3KvmLQ496YuxVr11+Z3nT4+RMHs3J9yA4Yf80gD1uJ5QWH9NBo9T7F42Clp7jHubx2r9xc oYzxGkQUBtVm98idtyq50+cvIo51Mdsq992IwlAOPg2i0Iq8/l0geTfFGGa1Iw== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1651254742; a=rsa-sha256; cv=none; b=siD3GosKrg+mRN1Jd9yuOuCVhbe9m/wD/WkNeKwBFpcQwdcr28vGR1pJd1Txl8u1rvBXwS NbnzcC08YKvoUDBnE86RKNEis/0I8UWS7qxzY4X8EgS7/RCYaxvZ7d1yZix98iWrr+RWi8 Dmo6pimfQHuORwwvG6gS1vE56WcszuqQkJoEt+EapA4wHlpZ9smTFMRwl4nk/oD2soT4G0 TVT5e7YHYyB3ewmYLYqroH305TnJAiO3yGiafOkx3QBPU8e9Z/Nlno1si9gPtmMs9ESu5j TcKm5Q9pVSkweBsFEfwVCT2G7SrksgUMttdggdYUxTWoiNOYqKhzO8IxEUtbzA== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D263662 Bug ID: 263662 Summary: kernel panics if fuse daemon returns parent's i-number in FUSE_CREATE Product: Base System Version: Unspecified Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: rtm@lcs.mit.edu Attachment #233588 text/plain mime type: Created attachment 233588 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D233588&action= =3Dedit fuse daemon that causes a panic by returning parent dir's i-number for FUSE_CREATE If a fuse daemon returns the parent directory's i-number for a new file in FUSE_CREATE, the kernel notices that it is trying to acquire a lock it already holds, and panics. I've attached a demo: # uname -a FreeBSD 14.0-CURRENT FreeBSD 14.0-CURRENT #1 main-n250917-440e36e68279: Fri Apr 29 07:33:58 EDT 2022=20=20=20=20 rtm@xxx:/usr/obj/usr/rtm/symbsd/src/riscv.riscv64/sys/RTM2 riscv # pkg install fusefs-libs # cc -I/usr/local/include/fuse -o futo1a futo1a.c -L/usr/local/lib -lfuse # ./futo1a ... panic: lockmgr_xlock_hard: recursing on non recursive lockmgr 0xffffffd0012e5cb0 @ /usr/rtm/symbsd/src/sys/kern/vfs_subr.c:3023=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20 cpuid =3D 0 time =3D 1649872295 KDB: stack backtrace: db_trace_self() at db_trace_self db_trace_self_wrapper() at db_trace_self_wrapper+0x38 kdb_backtrace() at kdb_backtrace+0x2c vpanic() at vpanic+0x16e panic() at panic+0x2a lockmgr_xlock_hard() at lockmgr_xlock_hard+0xb4 lockmgr_lock_flags() at lockmgr_lock_flags+0x14e vop_stdlock() at vop_stdlock+0x1c VOP_LOCK1_APV() at VOP_LOCK1_APV+0x32 VOP_LOCK1() at VOP_LOCK1+0x2e _vn_lock() at _vn_lock+0x30 vget_finish() at vget_finish+0x48 vfs_hash_get() at vfs_hash_get+0xb6 fuse_vnode_alloc() at fuse_vnode_alloc+0x5c fuse_vnode_get() at fuse_vnode_get+0x48 fuse_vnop_create() at fuse_vnop_create+0x300 VOP_CREATE_APV() at VOP_CREATE_APV+0x3a VOP_CREATE() at VOP_CREATE+0x2e vn_open_cred() at vn_open_cred+0x21e kern_openat() at kern_openat+0x16a sys_openat() at sys_openat+0x32 syscallenter() at syscallenter+0xf4 ecall_handler() at ecall_handler+0x18 do_trap_user() at do_trap_user+0xea cpu_exception_handler_user() at cpu_exception_handler_user+0x72 --- exception 8, tval =3D 0xd12b67000 KDB: enter: panic [ thread pid 35 tid 100051 ] Stopped at breakpoint+0xa: c.ldsp s0,0(sp) db> --=20 You are receiving this mail because: You are the assignee for the bug.=