====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/13195 is trying to acquire lock: 0000000074c29852 (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 0000000074c29852 (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow fs/namei.c:1688 [inline] 0000000074c29852 (&ovl_i_mutex_dir_key[depth]){++++}, at: walk_component+0x798/0xda0 fs/namei.c:1811 batman_adv: batadv0: Adding interface: gretap2741 but task is already holding lock: 000000006db32066 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 000000006db32066 (&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_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_pread64 fs/read_write.c:627 [inline] __do_sys_pread64 fs/read_write.c:637 [inline] __se_sys_pread64 fs/read_write.c:634 [inline] __x64_sys_pread64+0x1f7/0x250 fs/read_write.c:634 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 batman_adv: batadv0: Interface activated: gretap2741 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_fix_origin fs/overlayfs/namei.c:796 [inline] ovl_lookup+0x1109/0x1a00 fs/overlayfs/namei.c:915 __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_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_dir_key[depth]){++++}: down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:758 [inline] lookup_slow fs/namei.c:1688 [inline] walk_component+0x798/0xda0 fs/namei.c:1811 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2073 [inline] path_openat+0x1db/0x2df0 fs/namei.c:3536 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] --> &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.4/13195: #0: 000000006db32066 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 000000006db32066 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 13195 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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] lookup_slow fs/namei.c:1688 [inline] walk_component+0x798/0xda0 fs/namei.c:1811 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2073 [inline] path_openat+0x1db/0x2df0 fs/namei.c:3536 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: 0033:0x7f8f68e8f059 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:00007f8f67804168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f8f68fa1f60 RCX: 00007f8f68e8f059 RDX: 0000000020000ac0 RSI: 0000000020000800 RDI: 0000000020000340 RBP: 00007f8f68ee908d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffde6ead71f R14: 00007f8f67804300 R15: 0000000000022000 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "l´ :file0" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. batman_adv: Cannot find parent device overlayfs: unrecognized mount option "l´ :file0" or missing value batman_adv: batadv0: Adding interface: gretap2742 batman_adv: batadv0: Interface activated: gretap2742 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: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value usb 13-1: enqueue for inactive port 0 usb 13-1: enqueue for inactive port 0 batman_adv: batadv0: Adding interface: gretap2743 batman_adv: batadv0: Interface activated: gretap2743 vhci_hcd: vhci_device speed not set EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue 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. batman_adv: Cannot find parent device EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue batman_adv: batadv0: Adding interface: gretap2744 batman_adv: batadv0: Interface activated: gretap2744 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. overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2745 batman_adv: batadv0: Interface activated: gretap2745 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue batman_adv: Cannot find parent device overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. batman_adv: batadv0: Adding interface: gretap2746 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. batman_adv: batadv0: Interface activated: gretap2746 overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value 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. batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2747 overlayfs: bad mount option "redirect_dir=./file" overlayfs: failed to resolve './file1': -2 overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: batadv0: Interface activated: gretap2747 batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2748 batman_adv: batadv0: Interface activated: gretap2748 overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value 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: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2749 batman_adv: batadv0: Interface activated: gretap2749 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: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value overlayfs: maximum fs stacking depth exceeded batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2750 batman_adv: batadv0: Interface activated: gretap2750 overlayfs: unrecognized mount option "ldirM™µ—›2W" or missing value x_tables: ip_tables: TPROXY target: used from hooks FORWARD, but only usable from PREROUTING kauditd_printk_skb: 1 callbacks suppressed audit: type=1800 audit(1643823482.257:1355): pid=13606 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=14762 res=0 overlayfs: unrecognized mount option "ldirM™µ—›2W" or missing value batman_adv: Cannot find parent device x_tables: ip_tables: TPROXY target: used from hooks FORWARD, but only usable from PREROUTING batman_adv: batadv0: Adding interface: gretap2751 batman_adv: batadv0: Interface activated: gretap2751 overlayfs: unrecognized mount option "ldirM™µ—›2W" or missing value batman_adv: Cannot find parent device x_tables: ip_tables: TPROXY target: used from hooks FORWARD, but only usable from PREROUTING batman_adv: batadv0: Adding interface: gretap2752 batman_adv: batadv0: Interface activated: gretap2752 audit: type=1800 audit(1643823483.207:1356): pid=13716 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=13959 res=0 batman_adv: Cannot find parent device qnx4: no qnx4 filesystem (no root dir). batman_adv: batadv0: Adding interface: gretap2753 batman_adv: batadv0: Interface activated: gretap2753 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. audit: type=1800 audit(1643823483.407:1357): pid=13757 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=15044 res=0 overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2754 qnx4: no qnx4 filesystem (no root dir). overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: batadv0: Interface activated: gretap2754 qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir). batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2755 batman_adv: batadv0: Interface activated: gretap2755 qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir). batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2756 qnx4: no qnx4 filesystem (no root dir). batman_adv: batadv0: Interface activated: gretap2756 qnx4: no qnx4 filesystem (no root dir). batman_adv: Cannot find parent device qnx4: no qnx4 filesystem (no root dir). batman_adv: batadv0: Adding interface: gretap2757 batman_adv: batadv0: Interface activated: gretap2757 qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir). batman_adv: Cannot find parent device overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. batman_adv: batadv0: Adding interface: gretap2758 batman_adv: batadv0: Interface activated: gretap2758 qnx4: no qnx4 filesystem (no root dir). overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2759 batman_adv: batadv0: Interface activated: gretap2759 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2760 batman_adv: batadv0: Interface activated: gretap2760 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2761 batman_adv: batadv0: Interface activated: gretap2761 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2762 batman_adv: batadv0: Interface activated: gretap2762 overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2763 overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: batadv0: Interface activated: gretap2763 overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value batman_adv: Cannot find parent device batman_adv: batadv0: Adding interface: gretap2764 batman_adv: batadv0: Interface activated: gretap2764 overlayfs: unrecognized mount option "0x0000000000000003" or missing value overlayfs: unrecognized mount option "ÿÿÿÿ" or missing value overlayfs: unrecognized mount option "0x0000000000000003" or missing value batman_adv: Cannot find parent device overlayfs: unrecognized mount option "ÿÿÿÿ" or missing value