Re: [syzbot ci] Re: vfs: add O_CREAT|O_DIRECTORY to open*(2)
From: Jori Koolstra
Date: Mon May 25 2026 - 14:30:48 EST
#syz test
---
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index f468acb8ee7d..d1925333d327 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -771,6 +771,9 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
struct inode *inode;
int p9_omode;
+ if ((flags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
if (d_in_lookup(dentry)) {
struct dentry *res = v9fs_vfs_lookup(dir, dentry, 0);
if (res || d_really_is_positive(dentry))
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 141fb54db65d..9f4b865d07d7 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -239,6 +239,9 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
struct v9fs_session_info *v9ses;
struct posix_acl *pacl = NULL, *dacl = NULL;
+ if ((flags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
if (d_in_lookup(dentry)) {
struct dentry *res = v9fs_vfs_lookup(dir, dentry, 0);
if (res || d_really_is_positive(dentry))
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index d54d71669176..9707d9ed17b6 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -813,6 +813,9 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
if (dentry->d_name.len > NAME_MAX)
return -ENAMETOOLONG;
+ if ((flags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
err = ceph_wait_on_conflict_unlink(dentry);
if (err)
return err;
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index b658b6baf72f..4c59992b9867 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -940,6 +940,9 @@ static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
if (fuse_is_bad(dir))
return -EIO;
+ if ((flags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
if (d_in_lookup(entry)) {
struct dentry *res = fuse_lookup(dir, entry, 0);
if (res || d_really_is_positive(entry))
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index e9bf4879c07f..21c6544fbee5 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -1384,6 +1384,9 @@ static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
{
bool excl = !!(flags & O_EXCL);
+ if ((flags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
if (d_in_lookup(dentry)) {
struct dentry *d = __gfs2_lookup(dir, dentry, file);
if (file->f_mode & FMODE_OPENED) {
diff --git a/fs/namei.c b/fs/namei.c
index 60223278f9ec..9d9529ef30c4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4383,11 +4383,6 @@ static struct dentry *atomic_open(const struct path *path, struct dentry *dentry
struct inode *dir = path->dentry->d_inode;
int error;
- if ((open_flag & O_MKDIR_MASK) == O_MKDIR_MASK) {
- error = -EOPNOTSUPP;
- goto out;
- }
-
file->__f_path.dentry = DENTRY_NOT_SET;
file->__f_path.mnt = path->mnt;
error = dir->i_op->atomic_open(dir, dentry, file,
@@ -4410,7 +4405,6 @@ static struct dentry *atomic_open(const struct path *path, struct dentry *dentry
error = -ENOENT;
}
}
-out:
if (error) {
dput(dentry);
dentry = ERR_PTR(error);
@@ -4642,7 +4636,7 @@ static const char *open_last_lookups(struct nameidata *nd,
*/
}
if (open_flag & O_CREAT)
- inode_lock(dir->d_inode);
+ inode_lock_nested(dir->d_inode, I_MUTEX_PARENT);
else
inode_lock_shared(dir->d_inode);
dentry = lookup_open(nd, file, op, got_write, &delegated_inode);
@@ -4713,6 +4707,7 @@ static int do_open(struct nameidata *nd,
if (open_flag & O_CREAT) {
if ((open_flag & O_EXCL) && !(file->f_mode & FMODE_CREATED))
return -EEXIST;
+ // there are no special rules for creating dirs in a sticky bit dir
if (!(open_flag & O_DIRECTORY)) {
if (d_is_dir(nd->path.dentry))
return -EISDIR;
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e9ce1883288c..e44c7598b68e 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2314,6 +2314,9 @@ int nfs_atomic_open_v23(struct inode *dir, struct dentry *dentry,
if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
return -ENAMETOOLONG;
+ if ((open_flags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
if (open_flags & O_CREAT) {
error = nfs_do_create(dir, dentry, mode, open_flags);
if (!error) {
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 25048a3c2364..467f6bc707da 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -52,6 +52,9 @@ int nfs_check_flags(int flags)
if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
return -EINVAL;
+ if ((flags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
return 0;
}
EXPORT_SYMBOL_GPL(nfs_check_flags);
diff --git a/fs/open.c b/fs/open.c
index 68b694ae1843..865ea6f70e8c 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1209,7 +1209,7 @@ inline int build_open_flags(const struct open_how *how, struct open_flags *op)
if (WILL_CREATE(flags)) {
if (how->mode & ~S_IALLUGO)
return -EINVAL;
- if (flags & O_DIRECTORY)
+ if ((flags & (O_MKDIR_MASK)) == O_MKDIR_MASK)
op->mode = how->mode | S_IFDIR;
else
op->mode = how->mode | S_IFREG;
diff --git a/fs/smb/client/dir.c b/fs/smb/client/dir.c
index e4295a5b55b3..ec8c54c91261 100644
--- a/fs/smb/client/dir.c
+++ b/fs/smb/client/dir.c
@@ -526,6 +526,9 @@ int cifs_atomic_open(struct inode *dir, struct dentry *direntry,
if (unlikely(cifs_forced_shutdown(cifs_sb)))
return smb_EIO(smb_eio_trace_forced_shutdown);
+ if ((oflags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
/*
* Posix open is only called (at lookup time) for file create now. For
* opens (rather than creates), because we do not know if it is a file
diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c
index 42bedc4ec7af..aef5ca6730be 100644
--- a/fs/vboxsf/dir.c
+++ b/fs/vboxsf/dir.c
@@ -318,6 +318,9 @@ static int vboxsf_dir_atomic_open(struct inode *parent, struct dentry *dentry,
u64 handle;
int err;
+ if ((flags & O_MKDIR_MASK) == O_MKDIR_MASK)
+ return -EINVAL;
+
if (d_in_lookup(dentry)) {
struct dentry *res = vboxsf_dir_lookup(parent, dentry, 0);
if (res || d_really_is_positive(dentry))
diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
index a332e79b3207..e31f3a57f07c 100644
--- a/include/linux/fcntl.h
+++ b/include/linux/fcntl.h
@@ -12,6 +12,8 @@
FASYNC | O_DIRECT | O_LARGEFILE | O_DIRECTORY | O_NOFOLLOW | \
O_NOATIME | O_CLOEXEC | O_PATH | __O_TMPFILE)
+#define O_MKDIR_MASK (O_CREAT | O_DIRECTORY)
+
/* List of all valid flags for the how->resolve argument: */
#define VALID_RESOLVE_FLAGS \
(RESOLVE_NO_XDEV | RESOLVE_NO_MAGICLINKS | RESOLVE_NO_SYMLINKS | \
diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h
index 40ab8bbe668b..613475285643 100644
--- a/include/uapi/asm-generic/fcntl.h
+++ b/include/uapi/asm-generic/fcntl.h
@@ -95,8 +95,6 @@
#define O_NDELAY O_NONBLOCK
#endif
-#define O_MKDIR_MASK (O_CREAT | O_DIRECTORY)
-
#define F_DUPFD 0 /* dup */
#define F_GETFD 1 /* get close_on_exec */
#define F_SETFD 2 /* set/clear close_on_exec */
> Op 19-05-2026 08:59 CEST schreef syzbot ci <syzbot+ci8ee793bb5ffded2a@xxxxxxxxxxxxxxxxxxxxxxxxx>:
>
>
> syzbot ci has tested the following series
>
> [v4] vfs: add O_CREAT|O_DIRECTORY to open*(2)
> https://lore.kernel.org/all/20260518165237.2084042-1-jkoolstra@xxxxxxxxx
> * [RFC PATCH v4 1/2] vfs: add O_CREAT|O_DIRECTORY to open*(2)
> * [RFC PATCH v4 2/2] selftest: add tests for open*(O_CREAT|O_DIRECTORY)
>
> and found the following issues:
> * KASAN: slab-out-of-bounds Read in ovl_dir_release
> * general protection fault in path_openat
>
> Full report is available here:
> https://ci.syzbot.org/series/0d511b6b-6434-45cd-bbf3-51fe9d916e99
>
> ***
>
> KASAN: slab-out-of-bounds Read in ovl_dir_release
>
> tree: torvalds
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
> base: 5200f5f493f79f14bbdc349e402a40dfb32f23c8
> arch: amd64
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> config: https://ci.syzbot.org/builds/024b677f-50e7-4ef9-ae98-2652f5098bfd/config
> syz repro: https://ci.syzbot.org/findings/a7087360-137c-41f5-ae13-db4d551fe142/syz_repro
>
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in ovl_dir_release+0x228/0x2a0 fs/overlayfs/readdir.c:1033
> Read of size 8 at addr ffff88816cd2c818 by task syz.0.17/5813
>
> CPU: 0 UID: 0 PID: 5813 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> Call Trace:
> <TASK>
> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
> print_address_description+0x55/0x1e0 mm/kasan/report.c:378
> print_report+0x58/0x70 mm/kasan/report.c:482
> kasan_report+0x117/0x150 mm/kasan/report.c:595
> ovl_dir_release+0x228/0x2a0 fs/overlayfs/readdir.c:1033
> __fput+0x44f/0xa60 fs/file_table.c:510
> task_work_run+0x1d9/0x270 kernel/task_work.c:233
> resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
> __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
> exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98
> __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
> syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
> syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
> do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fe1a159ce59
> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffe25af07f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
> RAX: 0000000000000000 RBX: 00007ffe25af08e0 RCX: 00007fe1a159ce59
> RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
> RBP: 0000000000012e15 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000001b32a20000 R11: 0000000000000246 R12: 00007ffe25af0920
> R13: 00007fe1a1815fac R14: 0000000000012e53 R15: 00007fe1a1815fa0
> </TASK>
>
> Allocated by task 5814:
> kasan_save_stack mm/kasan/common.c:57 [inline]
> kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
> poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
> __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
> kasan_kmalloc include/linux/kasan.h:263 [inline]
> __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5419
> kmalloc_noprof include/linux/slab.h:950 [inline]
> kzalloc_noprof include/linux/slab.h:1188 [inline]
> ovl_file_alloc+0x4f/0x90 fs/overlayfs/file.c:99
> ovl_create_tmpfile fs/overlayfs/dir.c:1399 [inline]
> ovl_tmpfile+0x3fc/0x7d0 fs/overlayfs/dir.c:1448
> vfs_tmpfile+0x3ff/0x890 fs/namei.c:4794
> do_tmpfile+0xd3/0x240 fs/namei.c:4859
> path_openat+0x33c7/0x3b40 fs/namei.c:4893
> do_file_open+0x23e/0x4a0 fs/namei.c:4931
> do_sys_openat2+0x113/0x200 fs/open.c:1367
> do_sys_open fs/open.c:1373 [inline]
> __do_sys_open fs/open.c:1381 [inline]
> __se_sys_open fs/open.c:1377 [inline]
> __x64_sys_open+0x11e/0x150 fs/open.c:1377
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> The buggy address belongs to the object at ffff88816cd2c800
> which belongs to the cache kmalloc-16 of size 16
> The buggy address is located 8 bytes to the right of
> allocated 16-byte region [ffff88816cd2c800, ffff88816cd2c810)
>
> The buggy address belongs to the physical page:
> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88816cd2c840 pfn:0x16cd2c
> flags: 0x57ff00000000200(workingset|node=1|zone=2|lastcpupid=0x7ff)
> page_type: f5(slab)
> raw: 057ff00000000200 ffff888100041640 ffff888160400408 ffff888160400408
> raw: ffff88816cd2c840 0000000800800042 00000000f5000000 0000000000000000
> page dumped because: kasan: bad access detected
> page_owner tracks the page as allocated
> page last allocated via order 0, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5741, tgid 5741 (syz-executor), ts 77437404410, free_ts 77431264562
> set_page_owner include/linux/page_owner.h:32 [inline]
> post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858
> prep_new_page mm/page_alloc.c:1866 [inline]
> get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946
> __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
> alloc_slab_page mm/slub.c:3278 [inline]
> allocate_slab+0x77/0x660 mm/slub.c:3467
> new_slab mm/slub.c:3525 [inline]
> ___slab_alloc+0x154/0x6c0 mm/slub.c:4444
> __slab_alloc_node mm/slub.c:4510 [inline]
> slab_alloc_node mm/slub.c:4886 [inline]
> __do_kmalloc_node mm/slub.c:5294 [inline]
> __kvmalloc_node_noprof+0x34d/0x8a0 mm/slub.c:6832
> xt_jumpstack_alloc net/netfilter/x_tables.c:1449 [inline]
> do_replace_table+0x191/0x620 net/netfilter/x_tables.c:1486
> xt_register_table+0x269/0x960 net/netfilter/x_tables.c:1596
> ip6t_register_table+0x16b/0x330 net/ipv6/netfilter/ip6_tables.c:1754
> ip6table_raw_table_init+0x54/0x80 net/ipv6/netfilter/ip6table_raw.c:48
> xt_find_table_lock+0x30c/0x3f0 net/netfilter/x_tables.c:1353
> xt_request_find_table_lock+0x26/0x100 net/netfilter/x_tables.c:1378
> get_info net/ipv6/netfilter/ip6_tables.c:979 [inline]
> do_ip6t_get_ctl+0x716/0x1230 net/ipv6/netfilter/ip6_tables.c:1668
> nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
> ipv6_getsockopt+0x1fd/0x2b0 net/ipv6/ipv6_sockglue.c:1464
> do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2487
> page last free pid 15 tgid 15 stack trace:
> reset_page_owner include/linux/page_owner.h:25 [inline]
> __free_pages_prepare mm/page_alloc.c:1402 [inline]
> __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943
> rcu_do_batch kernel/rcu/tree.c:2617 [inline]
> rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
> handle_softirqs+0x22a/0x840 kernel/softirq.c:622
> run_ksoftirqd+0x36/0x60 kernel/softirq.c:1076
> smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
> kthread+0x389/0x470 kernel/kthread.c:436
> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>
> Memory state around the buggy address:
> ffff88816cd2c700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff88816cd2c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >ffff88816cd2c800: 00 00 fc fc 00 00 fc fc fc fc fc fc fc fc fc fc
> ^
> ffff88816cd2c880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff88816cd2c900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ==================================================================
>
>
> ***
>
> general protection fault in path_openat
>
> tree: torvalds
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
> base: 5200f5f493f79f14bbdc349e402a40dfb32f23c8
> arch: amd64
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> config: https://ci.syzbot.org/builds/024b677f-50e7-4ef9-ae98-2652f5098bfd/config
> syz repro: https://ci.syzbot.org/findings/4b3b0fe3-064c-43e2-b887-b3a52d87a16a/syz_repro
>
> BTRFS info (device loop1): enabling ssd optimizations
> BTRFS info (device loop1): turning on async discard
> BTRFS info (device loop1): enabling free space tree
> BTRFS info (device loop1): use zstd compression, level 3
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> CPU: 1 UID: 0 PID: 5849 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:__d_entry_type include/linux/dcache.h:429 [inline]
> RIP: 0010:d_can_lookup include/linux/dcache.h:444 [inline]
> RIP: 0010:do_open fs/namei.c:4726 [inline]
> RIP: 0010:path_openat+0x2e66/0x3b40 fs/namei.c:4902
> Code: e8 8f 49 7f ff eb 62 48 8b 44 24 78 42 80 3c 20 00 48 8b 5c 24 68 74 08 48 89 df e8 44 87 ea ff 4c 8b 3b 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 cb 09 00 00 41 bc 00 00 38 00 45 23 27
> RSP: 0018:ffffc9000405f960 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffffc9000405fc28 RCX: 0000000000000000
> RDX: ffff88810fe50000 RSI: 0000000000000002 RDI: 0000000000000000
> RBP: ffffc9000405fbb0 R08: ffff8881b949469b R09: 1ffff110372928d3
> R10: dffffc0000000000 R11: ffffed10372928d4 R12: dffffc0000000000
> R13: 1ffff1102eb65c88 R14: 000000000015d0c0 R15: 0000000000000001
> FS: 00007f074937f6c0(0000) GS:ffff8882a928a000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000c2113360000 CR3: 0000000103f3a000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> do_file_open+0x23e/0x4a0 fs/namei.c:4931
> do_sys_openat2+0x113/0x200 fs/open.c:1367
> do_sys_open fs/open.c:1373 [inline]
> __do_sys_openat fs/open.c:1389 [inline]
> __se_sys_openat fs/open.c:1384 [inline]
> __x64_sys_openat+0x138/0x170 fs/open.c:1384
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f074859ce59
> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f074937f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
> RAX: ffffffffffffffda RBX: 00007f0748815fa0 RCX: 00007f074859ce59
> RDX: 00000000001dd0c0 RSI: 0000200000000240 RDI: ffffffffffffff9c
> RBP: 00007f0748632d6f R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007f0748816038 R14: 00007f0748815fa0 R15: 00007fff34fee548
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:__d_entry_type include/linux/dcache.h:429 [inline]
> RIP: 0010:d_can_lookup include/linux/dcache.h:444 [inline]
> RIP: 0010:do_open fs/namei.c:4726 [inline]
> RIP: 0010:path_openat+0x2e66/0x3b40 fs/namei.c:4902
> Code: e8 8f 49 7f ff eb 62 48 8b 44 24 78 42 80 3c 20 00 48 8b 5c 24 68 74 08 48 89 df e8 44 87 ea ff 4c 8b 3b 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 cb 09 00 00 41 bc 00 00 38 00 45 23 27
> RSP: 0018:ffffc9000405f960 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffffc9000405fc28 RCX: 0000000000000000
> RDX: ffff88810fe50000 RSI: 0000000000000002 RDI: 0000000000000000
> RBP: ffffc9000405fbb0 R08: ffff8881b949469b R09: 1ffff110372928d3
> R10: dffffc0000000000 R11: ffffed10372928d4 R12: dffffc0000000000
> R13: 1ffff1102eb65c88 R14: 000000000015d0c0 R15: 0000000000000001
> FS: 00007f074937f6c0(0000) GS:ffff8882a928a000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f1c7a2f73b0 CR3: 0000000103f3a000 CR4: 00000000000006f0
> ----------------
> Code disassembly (best guess):
> 0: e8 8f 49 7f ff call 0xff7f4994
> 5: eb 62 jmp 0x69
> 7: 48 8b 44 24 78 mov 0x78(%rsp),%rax
> c: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
> 11: 48 8b 5c 24 68 mov 0x68(%rsp),%rbx
> 16: 74 08 je 0x20
> 18: 48 89 df mov %rbx,%rdi
> 1b: e8 44 87 ea ff call 0xffea8764
> 20: 4c 8b 3b mov (%rbx),%r15
> 23: 4c 89 f8 mov %r15,%rax
> 26: 48 c1 e8 03 shr $0x3,%rax
> * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
> 2f: 84 c0 test %al,%al
> 31: 0f 85 cb 09 00 00 jne 0xa02
> 37: 41 bc 00 00 38 00 mov $0x380000,%r12d
> 3d: 45 23 27 and (%r15),%r12d
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
> Tested-by: syzbot@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
>
> To test a patch for this bug, please reply with `#syz test`
> (should be on a separate line).
>
> The patch should be attached to the email.
> Note: arguments like custom git repos and branches are not supported.