overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/25319 is trying to acquire lock: 00000000d97a53db (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 00000000d97a53db (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline] 00000000d97a53db (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 but task is already holding lock: 00000000b822fb58 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 00000000b822fb58 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&sig->cred_guard_mutex){+.+.}: do_io_accounting fs/proc/base.c:2750 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #3 (&p->lock){+.+.}: seq_read+0x6b/0x11c0 fs/seq_file.c:164 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_create_object+0x96/0x290 fs/overlayfs/dir.c:602 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: inode_lock_shared include/linux/fs.h:758 [inline] lookup_slow fs/namei.c:1688 [inline] lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573 ovl_lookup_single+0x60/0x920 fs/overlayfs/namei.c:206 ovl_lookup_layer+0x3bd/0x440 fs/overlayfs/namei.c:292 ovl_lookup+0x729/0x1a00 fs/overlayfs/namei.c:903 __lookup_slow+0x246/0x4a0 fs/namei.c:1672 lookup_slow fs/namei.c:1689 [inline] walk_component+0x7ac/0xda0 fs/namei.c:1811 lookup_last fs/namei.c:2274 [inline] path_lookupat+0x1ff/0x8d0 fs/namei.c:2319 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x113/0x210 fs/stat.c:185 vfs_lstat include/linux/fs.h:3137 [inline] __do_sys_newlstat fs/stat.c:350 [inline] __se_sys_newlstat+0x96/0x120 fs/stat.c:344 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&ovl_i_mutex_dir_key[depth]#2){++++}: down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &ovl_i_mutex_dir_key[depth]#2 --> &p->lock --> &sig->cred_guard_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sig->cred_guard_mutex); lock(&p->lock); lock(&sig->cred_guard_mutex); lock(&ovl_i_mutex_dir_key[depth]#2); *** DEADLOCK *** 1 lock held by syz-executor.1/25319: #0: 00000000b822fb58 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 00000000b822fb58 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 25319 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd7366ca639 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd734c3d168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007fd7367eaf80 RCX: 00007fd7366ca639 RDX: 0000000020000840 RSI: 00000000200005c0 RDI: 00000000200001c0 RBP: 00007fd736725ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc926968cf R14: 00007fd734c3d300 R15: 0000000000022000 overlayfs: unrecognized mount option "perdir=./bus" or missing value EXT4-fs (loop1): Unrecognized mount option "er#Xrors=reoount-ro" or missing value overlayfs: overlapping lowerdir path audit: type=1326 audit(1668393096.459:116): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=25366 comm="syz-executor.4" exe="/root/syz-executor.4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f230221e639 code=0x7ffc0000 overlayfs: overlapping lowerdir path overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: overlapping lowerdir path netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1326 audit(1668393096.499:117): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=25366 comm="syz-executor.4" exe="/root/syz-executor.4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f230221e639 code=0x7ffc0000 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "worile1" or missing value overlayfs: unrecognized mount option "worile1" or missing value EXT4-fs (loop2): VFS: Can't find ext4 filesystem audit: type=1326 audit(1668393096.769:118): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=25366 comm="syz-executor.4" exe="/root/syz-executor.4" sig=0 arch=c000003e syscall=151 compat=0 ip=0x7f230221e639 code=0x7ffc0000 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs (loop1): Unrecognized mount option "er#Xrors=reoount-ro" or missing value audit: type=1326 audit(1668393096.909:119): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=25366 comm="syz-executor.4" exe="/root/syz-executor.4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f230221e639 code=0x7ffc0000 audit: type=1326 audit(1668393096.909:120): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=25366 comm="syz-executor.4" exe="/root/syz-executor.4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f230221e639 code=0x7ffc0000 overlayfs: upper fs does not support file handles, falling back to index=off. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "" or missing value EXT4-fs (loop2): VFS: Can't find ext4 filesystem overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "lowerdiR=.:file0ۼwU~=7&^Oil/СdS0yg3K] " or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: failed to resolve './file0': -2 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: unrecognized mount option "lowerdr.:file0" or missing value overlayfs: unrecognized mount option "upperdim=./bus" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "lowerdr.:file0" or missing value overlayfs: unrecognized mount option "upperdim=./bus" or missing value overlayfs: missing 'lowerdir' overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "lowerdr.:file0" or missing value overlayfs: unrecognized mount option "lowerdr.:file0" or missing value overlayfs: unrecognized mount option "upperdim=./bus" or missing value overlayfs: upper fs does not support file handles, falling back to index=off. EXT4-fs (loop1): Unrecognized mount option "nombaache" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "uppk(Berdir=./bus" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: upper fs does not support file handles, falling back to index=off. EXT4-fs (loop1): Unrecognized mount option "nombaache" or missing value overlayfs: unrecognized mount option "uppk(Berdir=./bus" or missing value netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): Unrecognized mount option "euid=00000000000000060928" or missing value overlayfs: unrecognized mount option "lowe.:file0tr!4 Km+3kN/$`pav) " or missing value EXT4-fs (loop2): Unrecognized mount option "euid=00000000000000060928" or missing value overlayfs: 'file0' not a directory overlayfs: './file0' not a directory netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): Unrecognized mount option "euid=00000000000000060928" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: 'file0' not a directory overlayfs: './file0' not a directory EXT4-fs mount: 17 callbacks suppressed EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "nF4wvElI&)W>_pZ}ǒZ iĵe`:;#VPnFnׇP!^7f=H93ϣ@N`\\";caƔ* R}^&1d Cn " or missing value EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: overlapping lowerdir path overlayfs: unrecognized mount option "nF4wvElI&)W>_pZ}ǒZ iĵe`:;#VPnFnׇP!^7f=H93ϣ@N`\\";caƔ* R}^&1d Cn " or missing value overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: failed to resolve './file0': -2 EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "lowvdid=.:ft5ile0" or missing value EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: failed to resolve './file1': -2 overlayfs: maximum fs stacking depth exceeded overlayfs: unrecognized mount option "lowvdid=.:ft5ile0" or missing value overlayfs: upper fs does not support file handles, falling back to index=off. EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: unrecognized mount option "u`perdir=Q/bus" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "u`perdir=Q/bus" or missing value raw_sendmsg: syz-executor.3 forgot to set AF_INET. Fix it! overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. nla_parse: 5 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: failed to resolve './file0': -2 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: upper fs does not support file handles, falling back to index=off. EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: unrecognized mount option "low|xĜr" or missing value overlayfs: upper fs does not support file handles, falling back to index=off. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "low|xĜr" or missing value EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. overlayfs: failed to resolve './file0': -2 EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: upper fs does not support file handles, falling back to index=off. EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: upper fs does not support file handles, falling back to index=off. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: upper fs does not support file handles, falling back to index=off. netlink: 'syz-executor.4': attribute type 4 has an invalid length. EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: unrecognized mount option "loJyLver" or missing value overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: unrecognized mount option "pperdir=./bus" or missing value EXT4-fs (loop2): Unrecognized mount option "nǎuache" or missing value overlayfs: unrecognized mount option "lowxrdir=./file0" or missing value overlayfs: unrecognized mount option "loJyLver" or missing value EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: filesystem on './bus' not supported as upperdir overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: unrecognized mount option "pperdir=./bus" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "loJyLver" or missing value netlink: 'syz-executor.3': attribute type 4 has an invalid length. EXT4-fs (loop1): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: unrecognized mount option "lowxrdir=./file0" or missing value