FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value overlayfs: filesystem on './file0' not supported as upperdir FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value ====================================================== WARNING: possible circular locking dependency detected 4.14.229-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/28666 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 __vfs_read+0xe4/0x620 fs/read_write.c:411 vfs_read+0x139/0x340 fs/read_write.c:447 SYSC_read fs/read_write.c:574 [inline] SyS_read+0xf2/0x210 fs/read_write.c:567 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_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538 lookup_open+0x77a/0x1750 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0xe08/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 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.1/28666: #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: 28666 Comm: syz-executor.1 Not tainted 4.14.229-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:00007f1d7422d188 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000020000480 RSI: 0000000020000340 RDI: 00000000200001c0 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffce7e3ca3f R14: 00007f1d7422d300 R15: 0000000000022000 print_req_error: I/O error, dev loop4, sector 0 FAT-fs (loop1): Unrecognized mount option "func=KEXEC_INITRAMFS_CHECK" or missing value FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value caif:caif_disconnect_client(): nothing to disconnect caif:caif_disconnect_client(): nothing to disconnect overlayfs: failed to resolve './file0O^!7SlOv Bxߝ){6M*eZ': -2 FAT-fs (loop1): Unrecognized mount option "func=KEXEC_INITRAMFS_CHECK" or missing value nla_parse: 12 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: filesystem on './file0' not supported as upperdir caif:caif_disconnect_client(): nothing to disconnect FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. FAT-fs (loop0): Unrecognized mount option "obj_role=+" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. FAT-fs (loop1): Unrecognized mount option "obj_r" or missing value audit: type=1804 audit(1617911109.028:68): pid=28893 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir147998064/syzkaller.u5FGyG/621/bus/bus" dev="sda1" ino=14249 res=1 FAT-fs (loop1): Unrecognized mount option "obj_r" or missing value audit: type=1804 audit(1617911109.058:69): pid=28893 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir147998064/syzkaller.u5FGyG/621/bus/bus" dev="sda1" ino=14249 res=1 FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value overlayfs: filesystem on './file0' not supported as upperdir FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value overlayfs: failed to resolve './fide1': -2 FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value overlayfs: failed to resolve './fide1': -2 FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value overlayfs: filesystem on './file0' not supported as upperdir FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value nla_parse: 45 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. overlayfs: filesystem on './file0' not supported as upperdir netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: filesystem on './file0' not supported as upperdir FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value overlayfs: filesystem on './file0' not supported as upperdir FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value overlayfs: './file0' not a directory overlayfs: unrecognized mount option "00000000000000000000000" or missing value FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value overlayfs: unrecognized mount option "00000000000000000000000" or missing value FAT-fs (loop1): Unrecognized mount option "obj_role=+" or missing value