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.4/4349 is trying to acquire lock: 0000000065e11e16 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 0000000065e11e16 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: do_last fs/namei.c:3326 [inline] 0000000065e11e16 (&ovl_i_mutex_dir_key[depth]#2){++++}, at: path_openat+0x17ec/0x2df0 fs/namei.c:3537 but task is already holding lock: 000000005e15e5ce (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 000000005e15e5ce (&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_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 -> #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_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 -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: 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 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2073 [inline] path_parentat+0x51/0x140 fs/namei.c:2367 filename_parentat+0x198/0x590 fs/namei.c:2389 do_renameat2+0x193/0xc70 fs/namei.c:4547 __do_sys_rename fs/namei.c:4675 [inline] __se_sys_rename fs/namei.c:4673 [inline] __x64_sys_rename+0x5d/0x80 fs/namei.c:4673 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]#2){++++}: 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_execveat+0x3d/0x50 fs/exec.c:1907 __do_sys_execveat fs/exec.c:1988 [inline] __se_sys_execveat fs/exec.c:1980 [inline] __x64_sys_execveat+0xe1/0x120 fs/exec.c:1980 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]#2 --> &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]#2); *** DEADLOCK *** 1 lock held by syz-executor.4/4349: #0: 000000005e15e5ce (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 000000005e15e5ce (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 4349 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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] 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_execveat+0x3d/0x50 fs/exec.c:1907 __do_sys_execveat fs/exec.c:1988 [inline] __se_sys_execveat fs/exec.c:1980 [inline] __x64_sys_execveat+0xe1/0x120 fs/exec.c:1980 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7feea4b0d209 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:00007feea3482168 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 RAX: ffffffffffffffda RBX: 00007feea4c1ff60 RCX: 00007feea4b0d209 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004 RBP: 00007feea4b67161 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd58a57e4f R14: 00007feea3482300 R15: 0000000000022000 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: Bad value '1I7-' for mount option 'size' 9pnet: Insufficient options for proto=fd netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. audit: type=1804 audit(1659195522.566:11636): pid=4470 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir2330951161/syzkaller.NPNuRF/1020/file0" dev="sda1" ino=14066 res=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: No value for mount option '"' netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: Bad mount option rootcontext netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. 9pnet: Insufficient options for proto=fd tmpfs: Bad value '1I7-' for mount option 'size' EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs warning (device loop2): ext4_group_extend:1831: will only finish group (32768 blocks, 32704 new) EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs warning (device sda1): ext4_group_extend:1831: will only finish group (524288 blocks, 256 new) EXT4-fs warning (device sda1): ext4_group_extend:1837: can't read last block, resize aborted EXT4-fs warning (device loop2): ext4_group_extend:1831: will only finish group (32768 blocks, 32704 new) nla_parse: 3 callbacks suppressed netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. 9pnet: Insufficient options for proto=fd EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs warning (device loop2): ext4_group_extend:1831: will only finish group (32768 blocks, 32704 new) netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue 9pnet: Insufficient options for proto=fd EXT4-fs warning (device loop2): ext4_group_extend:1831: will only finish group (32768 blocks, 32704 new) netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: No value for mount option 'h' tmpfs: Bad value '17g4mk26' for mount option 'nr_inodes' netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: No value for mount option 'ÿ' netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. audit: type=1326 audit(1659195528.727:11637): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5099 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7fee89251209 code=0x0 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19 caif:caif_disconnect_client(): nothing to disconnect chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT chnl_net:chnl_net_open(): state disconnected A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19 caif:caif_disconnect_client(): nothing to disconnect chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT audit: type=1804 audit(1659195529.687:11638): pid=5196 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2296789330/syzkaller.nVQgMD/479/file0/bus" dev="loop1" ino=152 res=1 chnl_net:chnl_net_open(): state disconnected A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. audit: type=1800 audit(1659195529.687:11639): pid=5196 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="loop1" ino=152 res=0 audit: type=1804 audit(1659195529.797:11640): pid=5209 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir3056837919/syzkaller.MFguYN/1540/bus" dev="sda1" ino=15569 res=1 audit: type=1800 audit(1659195529.797:11641): pid=5209 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=15569 res=0 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready audit: type=1804 audit(1659195529.857:11642): pid=5217 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir3056837919/syzkaller.MFguYN/1540/bus" dev="sda1" ino=15569 res=1 chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19 caif:caif_disconnect_client(): nothing to disconnect chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT chnl_net:chnl_net_open(): state disconnected A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. audit: type=1804 audit(1659195529.937:11643): pid=5224 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir3056837919/syzkaller.MFguYN/1541/bus" dev="sda1" ino=15298 res=1 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19 audit: type=1800 audit(1659195529.947:11644): pid=5224 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=15298 res=0 caif:caif_disconnect_client(): nothing to disconnect netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT chnl_net:chnl_net_open(): state disconnected A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. audit: type=1804 audit(1659195530.017:11645): pid=5233 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir3056837919/syzkaller.MFguYN/1541/bus" dev="sda1" ino=15298 res=1 audit: type=1804 audit(1659195530.157:11646): pid=5252 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir3056837919/syzkaller.MFguYN/1542/bus" dev="sda1" ino=15298 res=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.