overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. ====================================================== WARNING: possible circular locking dependency detected 4.14.226-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/25821 is trying to acquire lock: (&ovl_i_mutex_dir_key[depth]){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] (&ovl_i_mutex_dir_key[depth]){++++}, at: [] do_last fs/namei.c:3333 [inline] (&ovl_i_mutex_dir_key[depth]){++++}, at: [] path_openat+0x149b/0x2970 fs/namei.c:3569 but task is already holding lock: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds fs/exec.c:1404 [inline] (&sig->cred_guard_mutex){+.+.}, at: [] do_execveat_common+0x319/0x1f30 fs/exec.c:1748 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sig->cred_guard_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 lock_trace fs/proc/base.c:407 [inline] proc_pid_stack+0x13f/0x2f0 fs/proc/base.c:457 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4cf/0x1120 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_readv+0xfc/0x2c0 fs/read_write.c:1014 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #2 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 seq_read+0xba/0x1120 fs/seq_file.c:165 proc_reg_read+0xee/0x1a0 fs/proc/inode.c:217 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 kernel_readv fs/splice.c:361 [inline] default_file_splice_read+0x418/0x910 fs/splice.c:416 do_splice_to+0xfb/0x140 fs/splice.c:880 splice_direct_to_actor+0x207/0x730 fs/splice.c:952 do_splice_direct+0x164/0x210 fs/splice.c:1061 do_sendfile+0x47f/0xb30 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0xff/0x110 fs/read_write.c:1488 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (sb_writers#3){.+.+}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 sb_start_write include/linux/fs.h:1549 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 ovl_do_remove+0x67/0xb90 fs/overlayfs/dir.c:759 vfs_rmdir.part.0+0x144/0x390 fs/namei.c:3908 vfs_rmdir fs/namei.c:3893 [inline] do_rmdir+0x334/0x3c0 fs/namei.c:3968 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&ovl_i_mutex_dir_key[depth]){++++}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] do_last fs/namei.c:3333 [inline] path_openat+0x149b/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_open_execat+0xd3/0x450 fs/exec.c:849 do_execveat_common+0x711/0x1f30 fs/exec.c:1755 do_execve fs/exec.c:1860 [inline] SYSC_execve fs/exec.c:1941 [inline] SyS_execve+0x3b/0x50 fs/exec.c:1936 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: &ovl_i_mutex_dir_key[depth] --> &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]); *** DEADLOCK *** 1 lock held by syz-executor.3/25821: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds fs/exec.c:1404 [inline] #0: (&sig->cred_guard_mutex){+.+.}, at: [] do_execveat_common+0x319/0x1f30 fs/exec.c:1748 stack backtrace: CPU: 1 PID: 25821 Comm: syz-executor.3 Not tainted 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] do_last fs/namei.c:3333 [inline] path_openat+0x149b/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_open_execat+0xd3/0x450 fs/exec.c:849 do_execveat_common+0x711/0x1f30 fs/exec.c:1755 do_execve fs/exec.c:1860 [inline] SYSC_execve fs/exec.c:1941 [inline] SyS_execve+0x3b/0x50 fs/exec.c:1936 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f23d00dd188 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000020000580 RSI: 0000000020000200 RDI: 0000000020000140 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffdfaa7192f R14: 00007f23d00dd300 R15: 0000000000022000 xt_DSCP: dscp 40 out of range overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. xt_DSCP: dscp 40 out of range overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: option "workdir=./f" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: option "workdir=./f" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: option "workdir=./fileojperdir=./file0" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. block nbd1: Attempted send on invalid socket print_req_error: I/O error, dev nbd1, sector 0 audit: type=1804 audit(1616420028.391:45): pid=25904 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir632144993/syzkaller.Qiz0qd/9/bus" dev="sda1" ino=14256 res=1 overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. audit: type=1804 audit(1616420028.411:46): pid=25904 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir632144993/syzkaller.Qiz0qd/9/bus" dev="sda1" ino=14256 res=1 audit: type=1804 audit(1616420028.421:47): pid=25904 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir632144993/syzkaller.Qiz0qd/9/bus" dev="sda1" ino=14256 res=1 audit: type=1804 audit(1616420028.421:48): pid=25911 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir632144993/syzkaller.Qiz0qd/9/bus" dev="sda1" ino=14256 res=1 overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. ip_tables: iptables: counters copy to user failed while replacing table Bluetooth: hci1 command 0x0419 tx timeout overlayfs: failed to resolve './f)le0_x×ovBKnybD`ZAlowerdir=. " or missing value xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "+tAlowerdir=. " or missing value xt_DSCP: dscp 40 out of range overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: unrecognized mount option "upprdir=./file0" or missing value xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "upprdir=./file0" or missing value xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "lo7Erdir=./bus" or missing value overlayfs: unrecognized mount option "loserdir=./bus" or missing value overlayfs: unrecognized mount option "lo7Erdir=./bus" or missing value overlayfs: unrecognized mount option "loserdir=./bus" or missing value overlayfs: unrecognized mount option "_owerdir=./bus" or missing value x_tables: ip6_tables: TCPOPTSTRIP target: only valid in mangle table, not security xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "_owerdir=./bus" or missing value overlayfs: failed to resolve './file1': -2 x_tables: ip6_tables: TCPOPTSTRIP target: only valid in mangle table, not security xt_DSCP: dscp 40 out of range overlayfs: failed to resolve './file1': -2 x_tables: ip6_tables: TCPOPTSTRIP target: only valid in mangle table, not security overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. x_tables: ip6_tables: TCPOPTSTRIP target: only valid in mangle table, not security overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range x_tables: ip6_tables: TCPOPTSTRIP target: only valid in mangle table, not security IPVS: ftp: loaded support on port[0] = 21 xt_DSCP: dscp 40 out of range x_tables: ip6_tables: TCPOPTSTRIP target: only valid in mangle table, not security overlayfs: unrecognized mount option "dont_appise" or missing value device lo entered promiscuous mode overlayfs: unrecognized mount option "dont_appise" or missing value x_tables: ip6_tables: TCPOPTSTRIP target: only valid in mangle table, not security IPVS: ftp: loaded support on port[0] = 21 x_tables: ip6_tables: TCPOPTSTRIP target: only valid in mangle table, not security overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "le0" or missing value overlayfs: unrecognized mount option "le0" or missing value SQUASHFS error: zstd decompression error: 2 xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range SQUASHFS error: zstd decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x99 overlayfs: unrecognized mount option "18446744073709551615" or missing value SQUASHFS error: Unable to read metadata cache entry [99] SQUASHFS error: Unable to read inode 0x126 SQUASHFS error: zstd decompression error: 2 SQUASHFS error: zstd decompression failed, data probably corrupt SQUASHFS error: squashfs_read_data failed to read block 0x99 SQUASHFS error: Unable to read metadata cache entry [99] SQUASHFS error: Unable to read inode 0x126 overlayfs: unrecognized mount option "18446744073709551615" or missing value overlayfs: unrecognized mount option "lowerfir=./bus" or missing value xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "lowerfir=./bus" or missing value xt_DSCP: dscp 40 out of range overlayfs: failed to resolve './file0͞eQXLW': -2 xt_DSCP: dscp 40 out of range overlayfs: failed to resolve './file0͞eQXLW': -2 xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "lowerdsr=./bus" or missing value overlayfs: unrecognized mount option "lowerdsr=./bus" or missing value xt_DSCP: dscp 40 out of range overlayfs: failed to resolve './file1': -2 xt_DSCP: dscp 40 out of range overlayfs: failed to resolve './file1': -2 xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "worbkdir=./f./fil" or missing value overlayfs: unrecognized mount option "worbkdir=./f./fil" or missing value xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: failed to resolve './b': -2 overlayfs: failed to resolve './b': -2 bond0: team0 is up - this may be due to an out of date ifenslave bridge0: port 3(team0) entered blocking state xt_DSCP: dscp 40 out of range overlayfs: failed to resolve './fax7:j"^0MDiT[efj0=>Zn': -2 bridge0: port 3(team0) entered disabled state overlayfs: failed to resolve './fax7:j"^0MDiT[efj0=>Zn': -2 device team0 entered promiscuous mode overlayfs: unrecognized mount option "0xffffffffffffffff" or missing value xt_DSCP: dscp 40 out of range device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode overlayfs: unrecognized mount option "0xffffffffffffffff" or missing value overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state x_tables: ip_tables: socket match: used from hooks OUTPUT/POSTROUTING, but only valid from PREROUTING/INPUT xt_DSCP: dscp 40 out of range overlayfs: workdir is in-use by another mount, mount with '-o index=off' to override exclusive workdir protection. x_tables: ip_tables: socket match: used from hooks OUTPUT/POSTROUTING, but only valid from PREROUTING/INPUT overlayfs: failed to resolve './file1': -2 xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "in"ֻ3^)dex=oN" or missing value xt_DSCP: dscp 40 out of range overlayfs: failed to resolve './file1': -2 overlayfs: unrecognized mount option "in"ֻ3^)dex=oN" or missing value REISERFS warning (device loop5): super-6504 reiserfs_getopt: the option "usrjquota" requires an argument xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "orkdir=./file1" or missing value xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "orkdir=./file1" or missing value overlayfs: failed to resolve './file1': -2 overlayfs: unrecognized mount option "worKdir=./filep" or missing value overlayfs: unrecognized mount option "worKdir=./filep" or missing value xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "upperdir=./file0" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. xt_DSCP: dscp 40 out of range netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: missing 'lowerdir' xt_DSCP: dscp 40 out of range overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "lowerd/bus" or missing value overlayfs: unrecognized mount option "lowerd/bus" or missing value xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. xt_DSCP: dscp 40 out of range overlayfs: unrecognized mount option "nfs_export=on" or missing value overlayfs: unrecognized mount option "nfs_export=on" or missing value caif:caif_disconnect_client(): nothing to disconnect overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. x_tables: ip_tables: TPROXY target: used from hooks INPUT/FORWARD/POSTROUTING, but only usable from PREROUTING caif:caif_disconnect_client(): nothing to disconnect x_tables: ip_tables: TPROXY target: used from hooks INPUT/FORWARD/POSTROUTING, but only usable from PREROUTING overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range overlayfs: option "workdir=./fil" is useless in a non-upper mount, ignore xt_DSCP: dscp 40 out of range overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: option "workdir=./fil" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent xt_DSCP: dscp 40 out of range xt_DSCP: dscp 40 out of range