overlayfs: unrecognized mount option "p¡ï!d·>’8ö—Cý'«u›i‹NÝïµ°}&å±{uŽ³abzËùhãAÄU¢í\å€Ø2Ê#A¦PÑ" or missing value ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/1694 is trying to acquire lock: 00000000250033dc (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 00000000250033dc (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow fs/namei.c:1688 [inline] 00000000250033dc (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_one_len_unlocked+0x111/0x140 fs/namei.c:2573 but task is already holding lock: 000000001818f2fd (&ovl_i_mutex_dir_key[depth]#2){.+.+}, at: inode_lock_shared include/linux/fs.h:758 [inline] 000000001818f2fd (&ovl_i_mutex_dir_key[depth]#2){.+.+}, at: do_last fs/namei.c:3326 [inline] 000000001818f2fd (&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_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2793 proc_single_show+0xeb/0x170 fs/proc/base.c:755 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 do_preadv fs/read_write.c:1071 [inline] __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116 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.3/1694: #0: 000000003bad56bc (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 000000003bad56bc (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 #1: 000000001818f2fd (&ovl_i_mutex_dir_key[depth]#2){.+.+}, at: inode_lock_shared include/linux/fs.h:758 [inline] #1: 000000001818f2fd (&ovl_i_mutex_dir_key[depth]#2){.+.+}, at: do_last fs/namei.c:3326 [inline] #1: 000000001818f2fd (&ovl_i_mutex_dir_key[depth]#2){.+.+}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 stack backtrace: CPU: 0 PID: 1694 Comm: syz-executor.3 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: 0033:0x7f0dbbe98059 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:00007f0dba80d168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f0dbbfaaf60 RCX: 00007f0dbbe98059 RDX: 0000000020000840 RSI: 00000000200006c0 RDI: 00000000200003c0 RBP: 00007f0dbbef208d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc073abfbf R14: 00007f0dba80d300 R15: 0000000000022000 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 IPVS: length: 4096 != 8 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 audit: type=1800 audit(1644604920.385:210): pid=1812 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="file0" dev="fuse" ino=0 res=0 kvm [1857]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec audit: type=1800 audit(1644604921.281:211): pid=1875 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="file0" dev="fuse" ino=0 res=0 audit: type=1800 audit(1644604921.392:212): pid=1887 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.1" name="file0" dev="fuse" ino=0 res=0 kvm [1926]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec kvm [1941]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec kvm [1951]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec audit: type=1800 audit(1644604921.697:213): pid=1914 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.4" name="file0" dev="fuse" ino=0 res=0 audit: type=1800 audit(1644604921.728:214): pid=1923 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.2" name="file0" dev="fuse" ino=0 res=0 kvm [1966]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec kvm [1997]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec audit: type=1800 audit(1644604922.154:215): pid=1938 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="file0" dev="fuse" ino=0 res=0 audit: type=1800 audit(1644604922.286:216): pid=1953 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.1" name="file0" dev="fuse" ino=0 res=0 kvm [2045]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec kvm [2047]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec audit: type=1800 audit(1644604922.590:217): pid=1996 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.4" name="file0" dev="fuse" ino=0 res=0 audit: type=1800 audit(1644604922.620:218): pid=2001 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.2" name="file0" dev="fuse" ino=0 res=0 kvm [2068]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec audit: type=1800 audit(1644604923.046:219): pid=2035 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="file0" dev="fuse" ino=0 res=0 Cannot find add_set index 0 as target Cannot find add_set index 0 as target Cannot find add_set index 0 as target Cannot find add_set index 0 as target Cannot find add_set index 0 as target Cannot find add_set index 0 as target Cannot find add_set index 0 as target