====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/4554 is trying to acquire lock: 000000001231660d (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 000000001231660d (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow fs/namei.c:1688 [inline] 000000001231660d (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573 but task is already holding lock: 000000006137423c (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 000000006137423c (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline] 000000006137423c (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&ovl_i_mutex_dir_key[depth]#2){++++}: 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 -> #3 (&sig->cred_guard_mutex){+.+.}: do_io_accounting fs/proc/base.c:2750 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 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 -> #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_create_object+0x96/0x290 fs/overlayfs/dir.c:602 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 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] 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_open+0x698/0x1a20 fs/namei.c:3214 do_last fs/namei.c:3327 [inline] path_openat+0x1804/0x2df0 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] --> &sig->cred_guard_mutex --> &ovl_i_mutex_dir_key[depth]#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ovl_i_mutex_dir_key[depth]#2); lock(&sig->cred_guard_mutex); lock(&ovl_i_mutex_dir_key[depth]#2); lock(&ovl_i_mutex_dir_key[depth]); *** DEADLOCK *** 2 locks held by syz-executor.1/4554: #0: 00000000ac7e7399 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 00000000ac7e7399 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 #1: 000000006137423c (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] #1: 000000006137423c (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline] #1: 000000006137423c (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 stack backtrace: CPU: 0 PID: 4554 Comm: syz-executor.1 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] 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_open+0x698/0x1a20 fs/namei.c:3214 do_last fs/namei.c:3327 [inline] path_openat+0x1804/0x2df0 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: 0033:0x7f1b852eb109 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:00007f1b83c60168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f1b853fdf60 RCX: 00007f1b852eb109 RDX: 0000000020000b00 RSI: 0000000020000900 RDI: 00000000200004c0 RBP: 00007f1b8534505d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff74b955ef R14: 00007f1b83c60300 R15: 0000000000022000 audit: type=1800 audit(1655394548.275:23487): pid=4577 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=14018 res=0 overlayfs: failed to resolve './file1': -2 audit: type=1800 audit(1655394548.495:23488): pid=4573 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14035 res=0 tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' EXT4-fs warning (device loop2): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. EXT4-fs (loop2): mount failed overlayfs: overlapping lowerdir path tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. audit: type=1800 audit(1655394549.075:23489): pid=4648 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=13905 res=0 audit: type=1800 audit(1655394549.505:23490): pid=4674 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="file0" dev="sda1" ino=13968 res=0 EXT4-fs warning (device loop2): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. EXT4-fs (loop2): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. audit: type=1800 audit(1655394549.875:23491): pid=4689 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=13908 res=0 EXT4-fs (loop1): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' EXT4-fs (loop1): mount failed audit: type=1800 audit(1655394550.285:23492): pid=4719 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14118 res=0 EXT4-fs warning (device loop1): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' audit: type=1800 audit(1655394550.785:23493): pid=4757 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=13949 res=0 netlink: 'syz-executor.2': attribute type 1 has an invalid length. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. EXT4-fs warning (device loop1): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed audit: type=1800 audit(1655394551.206:23494): pid=4784 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14016 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs warning (device loop1): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 'syz-executor.2': attribute type 1 has an invalid length. EXT4-fs (loop1): mount failed tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. audit: type=1800 audit(1655394551.426:23495): pid=4849 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=13911 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs warning (device loop1): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): mount failed EXT4-fs warning (device loop1): ext4_enable_quotas:5883: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. kauditd_printk_skb: 2 callbacks suppressed audit: type=1800 audit(1655394551.736:23498): pid=4910 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=14257 res=0 EXT4-fs (loop1): mount failed tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' audit: type=1800 audit(1655394552.476:23499): pid=4990 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=13914 res=0 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' audit: type=1800 audit(1655394552.876:23500): pid=5029 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=13913 res=0 audit: type=1800 audit(1655394552.986:23501): pid=5043 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=14134 res=0 tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. EXT4-fs (loop1): bad geometry: block count 512 exceeds size of device (9 blocks) audit: type=1800 audit(1655394553.356:23502): pid=5083 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=13929 res=0 EXT4-fs (loop1): bad geometry: block count 512 exceeds size of device (9 blocks) overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' audit: type=1800 audit(1655394553.576:23503): pid=5115 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=13976 res=0 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' EXT4-fs (loop1): bad geometry: block count 512 exceeds size of device (9 blocks) audit: type=1800 audit(1655394554.236:23504): pid=5144 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14293 res=0 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. ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. audit: type=1800 audit(1655394554.556:23505): pid=5185 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=14056 res=0 tmpfs: No value for mount option '*˜àI¨Í‡féÛ-ÚD3µ:üŒCÉ|u‘'k÷e&Èãë÷dDrôåºå€' audit: type=1800 audit(1655394555.066:23506): pid=5205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14232 res=0