audit: type=1804 audit(1675040075.521:289): pid=1725 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2292964230/syzkaller.0kfhrF/1130/file0" dev="sda1" ino=14230 res=1 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.2/1791 is trying to acquire lock: 0000000057c50664 (&ovl_i_mutex_dir_key[depth]#3){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 0000000057c50664 (&ovl_i_mutex_dir_key[depth]#3){++++}, at: do_last fs/namei.c:3326 [inline] 0000000057c50664 (&ovl_i_mutex_dir_key[depth]#3){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 but task is already holding lock: 000000008554e127 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 000000008554e127 (&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){+.+.}: lock_trace fs/proc/base.c:402 [inline] proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938 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 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 -> #2 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_do_remove+0xf0/0xdb0 fs/overlayfs/dir.c:845 vfs_rmdir.part.0+0x10f/0x3d0 fs/namei.c:3882 vfs_rmdir fs/namei.c:3868 [inline] do_rmdir+0x3fd/0x490 fs/namei.c:3943 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]#2){++++}: 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] path_setxattr+0x95/0x190 fs/xattr.c:534 __do_sys_setxattr fs/xattr.c:554 [inline] __se_sys_setxattr fs/xattr.c:550 [inline] __x64_sys_setxattr+0xc0/0x160 fs/xattr.c:550 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]#3){++++}: 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]#3 --> &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]#3); *** DEADLOCK *** 1 lock held by syz-executor.2/1791: #0: 000000008554e127 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 000000008554e127 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 1791 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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: 0033:0x7f140bd700c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007f13fdaa0168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f140be90120 RCX: 00007f140bd700c9 RDX: 0000000020000700 RSI: 00000000200005c0 RDI: 0000000020000540 RBP: 00007f140bdcbae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffc3ac1c4f R14: 00007f13fdaa0300 R15: 0000000000022000 usb usb4: usbfs: process 1810 (syz-executor.4) did not claim interface 1 before use IPVS: ftp: loaded support on port[0] = 21 overlayfs: missing 'lowerdir' IPVS: ftp: loaded support on port[0] = 21 overlayfs: missing 'lowerdir' usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use overlayfs: unrecognized mount option "index=ogf" or missing value usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use overlayfs: unrecognized mount option "work`ir=./禔嫘璼身锝oJT睕BP\O1_俕le5" or missing value usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use usb usb4: usbfs: process 1919 (syz-executor.4) did not claim interface 1 before use overlayfs: missing 'lowerdir' usb usb4: usbfs: process 2031 (syz-executor.4) did not claim interface 1 before use overlayfs: unrecognized mount option "index=ogf" or missing value overlayfs: unrecognized mount option "work`ir=./禔嫘璼身锝oJT睕BP\O1_俕le5" or missing value overlayfs: unrecognized mount option "index=ogf" or missing value overlayfs: unrecognized mount option "work`ir=./禔嫘璼身锝oJT睕BP\O1_俕le5" or missing value kauditd_printk_skb: 20 callbacks suppressed audit: type=1804 audit(1675040080.011:310): pid=2100 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3188548762/syzkaller.NGdevJ/1092/file1" dev="sda1" ino=14403 res=1 netlink: 'syz-executor.2': attribute type 6 has an invalid length. netlink: 'syz-executor.2': attribute type 6 has an invalid length. audit: type=1804 audit(1675040080.791:311): pid=2155 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3188548762/syzkaller.NGdevJ/1093/file1" dev="sda1" ino=14453 res=1 netlink: 'syz-executor.2': attribute type 6 has an invalid length. vhci_hcd vhci_hcd.0: pdev(2) rhport(0) sockfd(4) vhci_hcd vhci_hcd.0: devid(0) speed(5) speed_str(super-speed) vhci_hcd vhci_hcd.0: Device attached vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device audit: type=1804 audit(1675040081.701:312): pid=2244 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3188548762/syzkaller.NGdevJ/1094/file1" dev="sda1" ino=14852 res=1 bond3: making interface vlan2 the new active one bond3: Enslaving vlan2 as an active interface with an up link nla_parse: 5 callbacks suppressed netlink: 9 bytes leftover after parsing attributes in process `syz-executor.3'. device gretap0 entered promiscuous mode netlink: 5 bytes leftover after parsing attributes in process `syz-executor.3'. 0猉功D龌: renamed from gretap0 device c0猉功D龌 left promiscuous mode netlink: 9 bytes leftover after parsing attributes in process `syz-executor.3'. device c0猉功D龌 entered promiscuous mode netlink: 5 bytes leftover after parsing attributes in process `syz-executor.3'. 1猉功D龌: renamed from c0猉功D龌 device c1猉功D龌 left promiscuous mode netlink: 9 bytes leftover after parsing attributes in process `syz-executor.3'. device c1猉功D龌 entered promiscuous mode netlink: 5 bytes leftover after parsing attributes in process `syz-executor.3'. 0猉功D龌: renamed from c1猉功D龌 device c0猉功D龌 left promiscuous mode netlink: 'syz-executor.0': attribute type 10 has an invalid length. netlink: 'syz-executor.0': attribute type 10 has an invalid length. audit: type=1800 audit(1675040084.211:313): pid=2500 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 netlink: 'syz-executor.0': attribute type 10 has an invalid length. audit: type=1800 audit(1675040085.021:314): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.021:315): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.021:316): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.031:317): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.031:318): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.031:319): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.031:320): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.041:321): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.041:322): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0 audit: type=1800 audit(1675040085.041:323): pid=2594 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="mixer" dev="sda1" ino=14259 res=0