overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/10640 is trying to acquire lock: overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. 0000000016018cef (&ovl_i_mutex_key[depth]#2){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 0000000016018cef (&ovl_i_mutex_key[depth]#2){+.+.}, at: process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 but task is already holding lock: 0000000049a8a1a1 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 0000000049a8a1a1 (&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: -> #3 (&sig->cred_guard_mutex){+.+.}: lock_trace fs/proc/base.c:402 [inline] proc_pid_stack+0x160/0x350 fs/proc/base.c:452 proc_single_show+0xeb/0x170 fs/proc/base.c:755 overlayfs: missing 'lowerdir' seq_read+0x4e0/0x11c0 fs/seq_file.c:232 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 overlayfs: unrecognized mount option "e0" or missing value 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 (&p->lock){+.+.}: seq_read+0x6b/0x11c0 fs/seq_file.c:164 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 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 -> #1 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_xattr_set+0x53/0x600 fs/overlayfs/inode.c:338 __vfs_setxattr+0x10e/0x170 fs/xattr.c:149 __vfs_setxattr_noperm+0x11a/0x420 fs/xattr.c:180 __vfs_setxattr_locked+0x176/0x250 fs/xattr.c:238 vfs_setxattr+0xe5/0x270 fs/xattr.c:255 setxattr+0x23d/0x330 fs/xattr.c:520 path_setxattr+0x170/0x190 fs/xattr.c:539 __do_sys_lsetxattr fs/xattr.c:561 [inline] __se_sys_lsetxattr fs/xattr.c:557 [inline] __x64_sys_lsetxattr+0xbd/0x150 fs/xattr.c:557 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&ovl_i_mutex_key[depth]#2){+.+.}: down_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 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_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_key[depth]#2); *** DEADLOCK *** 1 lock held by syz-executor.4/10640: #0: 0000000049a8a1a1 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 0000000049a8a1a1 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 10640 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 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_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 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: 0033:0x7f332667f279 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:00007f3324f70168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f33267922c0 RCX: 00007f332667f279 RDX: 0000000020000940 RSI: 0000000020000540 RDI: 00000000200002c0 RBP: 00007f33266d92e9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc86fd448f R14: 00007f3324f70300 R15: 0000000000022000 overlayfs: unrecognized mount option "ِ84+lowyrdir=/file0" or missing value overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "ِ84+lowyrdir=/file0" or missing value overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "ِ84+lowyrdir=/file0" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' EXT4-fs (loop1): VFS: Can't find ext4 filesystem overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' EXT4-fs (loop1): VFS: Can't find ext4 filesystem overlayfs: filesystem on './bus' not supported as upperdir overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs (loop1): VFS: Can't find ext4 filesystem overlayfs: failed to resolve './file0bL'~R4aD5w~Nx꧓rR': -2 overlayfs: missing 'lowerdir' EXT4-fs (loop1): VFS: Can't find ext4 filesystem overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' EXT4-fs (loop1): VFS: Can't find ext4 filesystem overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: failed to resolve './file0bL'~R4aD5w~Nx꧓rR': -2 overlayfs: maximum fs stacking depth exceeded overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "uppepdir=./bus" or missing value overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: maximum fs stacking depth exceeded overlayfs: unrecognized mount option "uppepdir=./bus" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "workdird" or missing value overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "workdird" or missing value overlayfs: missing 'lowerdir' overlayfs: 'file0' not a directory overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "workdird" or missing value overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' 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. overlayfs: missing 'lowerdir' overlayfs: failed to resolve './file1': -2 IPVS: ftp: loaded support on port[0] = 21 overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' IPVS: ftp: loaded support on port[0] = 21 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' IPVS: ftp: loaded support on port[0] = 21 overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. IPVS: ftp: loaded support on port[0] = 21 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. overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 overlayfs: failed to resolve './file1': -2 IPVS: ftp: loaded support on port[0] = 21 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. IPVS: ftp: loaded support on port[0] = 21 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' IPVS: ftp: loaded support on port[0] = 21 overlayfs: overlapping lowerdir path overlayfs: failed to resolve './file1': -2 IPVS: ftp: loaded support on port[0] = 21 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "v=O~ڼ@B " or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "upp" or missing value overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "v=O~ڼ@B " or missing value overlayfs: unrecognized mount option "upp" or missing value overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' IPVS: ftp: loaded support on port[0] = 21 overlayfs: missing 'lowerdir' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' IPVS: ftp: loaded support on port[0] = 21