bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "upperdi" or missing value ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/9597 is trying to acquire lock: 8021q: adding VLAN 0 to HW filter on device batadv761 0000000087468750 (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 0000000087468750 (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow fs/namei.c:1688 [inline] 0000000087468750 (&ovl_i_mutex_dir_key[depth]){++++}, at: walk_component+0x798/0xda0 fs/namei.c:1811 but task is already holding lock: bond192: Enslaving batadv761 as a backup interface with an up link 000000008558ff1e (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 000000008558ff1e (&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_syscall+0xb8/0x2f0 fs/proc/base.c:635 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] 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.4/9597: #0: 000000008558ff1e (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 000000008558ff1e (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 9597 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 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_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: 0033:0x7f6e0b30c109 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:00007f6e09c1e168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f6e0b41f1d0 RCX: 00007f6e0b30c109 RDX: 0000000020000500 RSI: 0000000020000340 RDI: 0000000020000200 RBP: 00007f6e0b36605d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff5cf508bf R14: 00007f6e09c1e300 R15: 0000000000022000 bond192 (unregistering): Releasing backup interface batadv761 validate_nla: 8 callbacks suppressed netlink: 'syz-executor.5': attribute type 3 has an invalid length. bond192 (unregistering): Released all slaves netlink: 'syz-executor.3': attribute type 1 has an invalid length. overlayfs: unrecognized mount option "upperdi" or missing value netlink: 'syz-executor.0': attribute type 1 has an invalid length. netlink: 'syz-executor.5': attribute type 3 has an invalid length. 8021q: adding VLAN 0 to HW filter on device batadv762 netlink: 'syz-executor.5': attribute type 3 has an invalid length. bond192: Enslaving batadv762 as a backup interface with an up link bond28 (unregistering): Released all slaves bond192 (unregistering): Releasing backup interface batadv762 netlink: 'syz-executor.5': attribute type 3 has an invalid length. bond192 (unregistering): Released all slaves overlayfs: failed to resolve './file0': -2 netlink: 'syz-executor.5': attribute type 3 has an invalid length. netlink: 'syz-executor.5': attribute type 3 has an invalid length. netlink: 'syz-executor.5': attribute type 3 has an invalid length. netlink: 'syz-executor.5': attribute type 3 has an invalid length. 8021q: adding VLAN 0 to HW filter on device batadv763 bond192: Enslaving batadv763 as a backup interface with an up link bond192 (unregistering): Releasing backup interface batadv763 bond192 (unregistering): Released all slaves bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "uperdir=/bus" or missing value bond192 (unregistering): Released all slaves overlayfs: unrecognized mount option "uperdir=/bus" or missing value bond28 (unregistering): Released all slaves nla_parse: 16 callbacks suppressed netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: missing 'lowerdir' 9pnet: Insufficient options for proto=fd netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'. overlayfs: failed to resolve './file1': -2 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.0'. bond28 (unregistering): Released all slaves netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.0'. 9pnet: Insufficient options for proto=fd netlink: 32 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.0'. tmpfs: Bad value '-0286g' for mount option 'nr_blocks' overlayfs: missing 'lowerdir' bond28 (unregistering): Released all slaves 9pnet: Insufficient options for proto=fd bond193 (uninitialized): Released all slaves tmpfs: Bad value '-0286g' for mount option 'nr_blocks' bond28 (unregistering): Released all slaves overlayfs: failed to resolve './rus'': -2 overlayfs: failed to resolve './rus'': -2 bond193 (uninitialized): Released all slaves overlayfs: failed to resolve './file0|@kػJ': -2 bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "lowerdir" or missing value overlayfs: failed to resolve './file0|@kػJ': -2 bond193 (unregistering): Released all slaves overlayfs: unrecognized mount option "lowerdir" or missing value bond28 (unregistering): Released all slaves overlayfs: failed to resolve './file0|@kػJ': -2 overlayfs: unrecognized mount option "uppedir=.P ֜" or missing value bond193 (unregistering): Released all slaves bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "uppedir=.P ֜" or missing value bond193 (unregistering): Released all slaves overlayfs: failed to resolve './file0': -2 overlayfs: unrecognized mount option "uppedir=.P ֜" or missing value bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "lowerdil̯V:" or missing value overlayfs: unrecognized mount option "uTpe" or missing value bond193 (unregistering): Released all slaves overlayfs: unrecognized mount option "lowerdil̯V:" or missing value bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "uTpe" or missing value overlayfs: unrecognized mount option "lowerdil̯V:" or missing value overlayfs: failed to resolve './file1': -2 bond193 (unregistering): Released all slaves overlayfs: failed to resolve './file1': -2 bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option ")${Ii}+Jm*M4rW" or missing value overlayfs: unrecognized mount option ")${Ii}+Jm*M4rW" or missing value bond193 (unregistering): Released all slaves overlayfs: unrecognized mount option "" or missing value bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option ")${Ii}+Jm*M4rW" or missing value bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "" or missing value new mount options do not match the existing superblock, will be ignored overlayfs: unrecognized mount option "worjdir=./file1 " or missing value bond28 (unregistering): Released all slaves validate_nla: 83 callbacks suppressed netlink: 'syz-executor.3': attribute type 1 has an invalid length. bond28 (unregistering): Released all slaves overlayfs: failed to resolve './file0': -2 orangefs_mount: mount request failed with -4 overlayfs: unrecognized mount option "hsh rd:P p47" or missing value netlink: 'syz-executor.3': attribute type 1 has an invalid length. netlink: 'syz-executor.0': attribute type 1 has an invalid length. overlayfs: unrecognized mount option "hsh rd:P p47" or missing value 8021q: adding VLAN 0 to HW filter on device batadv767 bond193: Enslaving batadv767 as a backup interface with an up link bond28 (unregistering): Released all slaves bond193 (unregistering): Releasing backup interface batadv767 overlayfs: missing 'lowerdir' bond193 (unregistering): Released all slaves orangefs_mount: mount request failed with -4 overlayfs: missing 'lowerdir' netlink: 'syz-executor.3': attribute type 1 has an invalid length. overlayfs: unrecognized mount option "worjdir=./file1 " or missing value overlayfs: missing 'lowerdir' netlink: 'syz-executor.0': attribute type 1 has an invalid length. nla_parse: 13 callbacks suppressed netlink: 228 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. 8021q: adding VLAN 0 to HW filter on device batadv768 bond193: Enslaving batadv768 as a backup interface with an up link bond28 (unregistering): Released all slaves bond193 (unregistering): Releasing backup interface batadv768 bond193 (unregistering): Released all slaves overlayfs: unrecognized mount option "workd" or missing value netlink: 'syz-executor.0': attribute type 1 has an invalid length. orangefs_mount: mount request failed with -4 netlink: 'syz-executor.3': attribute type 1 has an invalid length. overlayfs: unrecognized mount option "lowerdyr=./file0" or missing value netlink: 'syz-executor.0': attribute type 1 has an invalid length. overlayfs: unrecognized mount option "lowerdyr=./file0" or missing value overlayfs: unrecognized mount option "workd" or missing value netlink: 228 bytes leftover after parsing attributes in process `syz-executor.2'. 8021q: adding VLAN 0 to HW filter on device batadv769 bond193: Enslaving batadv769 as a backup interface with an up link bond193 (unregistering): Releasing backup interface batadv769 bond193 (unregistering): Released all slaves overlayfs: unrecognized mount option "uppq!bus" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. bond28 (unregistering): Released all slaves netlink: 'syz-executor.3': attribute type 1 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "uppq!bus" or missing value overlayfs: unrecognized mount option "workd" or missing value netlink: 228 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "uppq!bus" or missing value netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 'syz-executor.3': attribute type 1 has an invalid length. bond28 (unregistering): Released all slaves bond193 (unregistering): Released all slaves bond28 (unregistering): Released all slaves overlayfs: unrecognized mount option "upperdiworerdir=.file0" or missing value overlayfs: failed to resolve '.+file1': -2 overlayfs: unrecognized mount option "upperdiworerdir=.file0" or missing value overlayfs: failed to resolve '.+file1': -2 bond28 (unregistering): Released all slaves overlayfs: failed to resolve '.+file1': -2 overlayfs: unrecognized mount option "upperdiworerdir=.file0" or missing value bond193 (unregistering): Released all slaves