====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/10131 is trying to acquire lock: 00000000866b61c6 (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline] 00000000866b61c6 (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow fs/namei.c:1688 [inline] 00000000866b61c6 (&ovl_i_mutex_dir_key[depth]){++++}, at: walk_component+0x798/0xda0 fs/namei.c:1811 but task is already holding lock: 00000000e175df47 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 00000000e175df47 (&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 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 (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms 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_do_remove+0xf0/0xdb0 fs/overlayfs/dir.c:845 vfs_rmdir.part.0+0x10f/0x3d0 fs/namei.c:3882 vfs_rmdir fs/namei.c:3868 [inline] do_rmdir+0x3fd/0x490 fs/namei.c:3943 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.5/10131: #0: 00000000e175df47 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 00000000e175df47 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 10131 Comm: syz-executor.5 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: 0033:0x7face61aa0e9 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:00007face4b1f168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007face62bcf60 RCX: 00007face61aa0e9 RDX: 0000000020000380 RSI: 0000000020000280 RDI: 0000000020000100 RBP: 00007face620408d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd0a1625af R14: 00007face4b1f300 R15: 0000000000022000 (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: failed to resolve './buss_export=onIh2Wwvjh0; ݺ4ʦ': -2 (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms nla_parse: 75 callbacks suppressed netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: failed to resolve './buss_export=onIh2Wwvjh0; ݺ4ʦ': -2 (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: failed to resolve './file0': -2 overlayfs: unrecognized mount option "smackfstransmute=[" or missing value audit: type=1804 audit(1652200309.440:606): pid=10524 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2615014475/syzkaller.ZEqpUN/779/file0/file0" dev="sda1" ino=14020 res=1 overlayfs: unrecognized mount option "work" or missing value (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "smackfstransmute=[" or missing value audit: type=1804 audit(1652200309.870:607): pid=10645 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2615014475/syzkaller.ZEqpUN/781/file0/file0" dev="sda1" ino=14018 res=1 overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value audit: type=1800 audit(1652200310.320:608): pid=10714 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="overlay" ino=14374 res=0 overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms audit: type=1800 audit(1652200310.570:609): pid=10774 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="overlay" ino=13989 res=0 overlayfs: unrecognized mount option "workdi " or missing value overlayfs: filesystem on './bus' not supported as upperdir (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "nfs_ex" or missing value overlayfs: unrecognized mount option "workdi " or missing value netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "nfs_ex" or missing value overlayfs: unrecognized mount option "workdi " or missing value (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "nfs_ex" or missing value (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: failed to resolve './file1': -2 (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './file1': -2 (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: failed to resolve './file1': -2 nla_parse: 8 callbacks suppressed netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: failed to resolve './file0': -2 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "k'ʔF\Pϐ TJѽ >"59mw01777777777777777777777" or missing value (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "k'ʔF\Pϐ TJѽ >"59mw01777777777777777777777" or missing value (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "k'ʔF\Pϐ TJѽ >"59mw01777777777777777777777" or missing value (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "nfs_export=onVIkvea)?=|DŽP݃-p}_sgZv'•Jp" or missing value overlayfs: unrecognized mount option "hash" or missing value overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "nfs_export=onVIkvea)?=|DŽP݃-p}_sgZv'•Jp" or missing value overlayfs: missing 'lowerdir' (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "nfs_export=onVIkvea)?=|DŽP݃-p}_sgZv'•Jp" or missing value overlayfs: unrecognized mount option "hash" or missing value overlayfs: missing 'lowerdir' netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.4'. (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: option "workdir=./file1" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: option "workdir=./file1" is useless in a non-upper mount, ignore overlayfs: at least 2 lowerdir are needed while upperdir nonexistent (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: unrecognized mount option "nfs_export=onB?>xOf.\ϑ٩d>ѨŚM@=b?" or missing value netlink: 'syz-executor.1': attribute type 1 has an invalid length. befs: Unrecognized mount option "overlgVO" or missing value befs: (loop5): cannot parse mount options overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: unrecognized mount option "nfs_export=onB?>xOf.\ϑ٩d>ѨŚM@=b?" or missing value overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir befs: Unrecognized mount option "overlgVO" or missing value befs: (loop5): cannot parse mount options overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir (unnamed net_device) (uninitialized): up delay (255) is not a multiple of miimon (9), updelay rounded to 252 ms overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir netlink: 'syz-executor.1': attribute type 1 has an invalid length. overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: unrecognized mount option "nfs_export=onB?>xOf.\ϑ٩d>ѨŚM@=b?" or missing value overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir overlayfs: filesystem on './bus' not supported as upperdir befs: Unrecognized mount option "overlgVO" or missing value befs: (loop5): cannot parse mount options overlayfs: filesystem on './bus' not supported as upperdir netlink: 'syz-executor.1': attribute type 1 has an invalid length. overlayfs: filesystem on './bus' not supported as upperdir