I filed this a few months ago and can still be reproduced easily with kernel 4.1.1: https://bugzilla.kernel.org/show_bug.cgi?id=94531 [ 224.248568] ------------[ cut here ]------------ [ 224.252792] kernel BUG at fs/9p/acl.c:96! [ 224.256308] invalid opcode: 0000 [#1] [ 224.258424] Modules linked in: af_packet [ 224.258424] CPU: 0 PID: 266 Comm: ls Not tainted 4.1.1-kvm #1 [ 224.258424] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.2-20150617_082717-anatol 04/01/2014 [ 224.258424] task: ffff880025029a40 ti: ffff8800252f0000 task.ti: ffff8800252f0000 [ 224.258424] RIP: 0010:[<ffffffff81149c5f>] [<ffffffff81149c5f>] v9fs_get_cached_acl+0xf/0x13 [ 224.258424] RSP: 0018:ffff8800252f3d08 EFLAGS: 00010246 [ 224.258424] RAX: ffffffffffffffff RBX: ffff8800252f3db0 RCX: 0000000000000000 [ 224.258424] RDX: ffffffffffffffff RSI: 0000000000008000 RDI: ffff880025cba040 [ 224.258424] RBP: ffff8800252f3d08 R08: 0000000000008000 R09: ff72726462626000 [ 224.258424] R10: ffff880025ca3600 R11: 0000000000000000 R12: ffff880025ca3600 [ 224.258424] R13: 0000000000000000 R14: 0000000000000000 R15: ffff880025cba040 [ 224.258424] FS: 00007fad3f89b700(0000) GS:ffffffff8161a000(0000) knlGS:0000000000000000 [ 224.258424] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 224.258424] CR2: 00007fad3f8b1000 CR3: 0000000001f1b000 CR4: 00000000000007b0 [ 224.258424] Stack: [ 224.258424] ffff8800252f3d38 ffffffff81149f1f 0000000000000000 0000000000000000 [ 224.258424] ffff8800252f3db0 ffff880025ca3600 ffff8800252f3d60 ffffffff810ce701 [ 224.258424] 0000000000000000 0000000000000000 ffff8800252f3dc7 ffff8800252f3d98 [ 224.258424] Call Trace: [ 224.258424] [<ffffffff81149f1f>] v9fs_xattr_get_acl+0x67/0xaf [ 224.258424] [<ffffffff810ce701>] generic_getxattr+0x4d/0x55 [ 224.258424] [<ffffffff810cea8c>] vfs_getxattr+0x90/0x9d [ 224.258424] [<ffffffff810cedf3>] getxattr+0xcb/0x186 [ 224.258424] [<ffffffff810c0de5>] ? user_path_at_empty+0x80/0xca [ 224.258424] [<ffffffff8115ee7e>] ? __aa_current_profile+0x1c/0x1e [ 224.258424] [<ffffffff811481a3>] ? v9fs_cached_dentry_delete+0x28/0x35 [ 224.258424] [<ffffffff810cef0a>] path_getxattr+0x5c/0xa2 [ 224.258424] [<ffffffff810cf684>] SyS_getxattr+0xf/0x11 [ 224.258424] [<ffffffff8138d26b>] system_call_fastpath+0x12/0x71 [ 224.258424] Code: 33 f6 ff 8b 45 d4 eb 08 31 c0 c3 b8 f4 ff ff ff 5a 5b 41 5c 41 5d 41 5e 41 5f 5d c3 55 48 89 e5 e8 3b 29 fa ff 48 83 f8 ff 75 02 <0f> 0b 5d c3 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 70 [ 224.258424] RIP [<ffffffff81149c5f>] v9fs_get_cached_acl+0xf/0x13 [ 224.258424] RSP <ffff8800252f3d08> [ 224.366590] ---[ end trace 11bd711b8565ce78 ]--- [ 224.367527] Kernel panic - not syncing: Fatal exception [ 224.368142] Kernel Offset: disabled [ 224.368610] Rebooting in 30 seconds.. /home home-archvm-one 9p rw,relatime,dirsync,trans=virtio,version=9p2000.L,posixacl,cache=fscache If something on the host pollutes the directory where 9p is mounted in the guest it crashes the kernel on ls/getfacl or whatever. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
