syzbot

======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.4/22634 is trying to acquire lock:
000000000058a1d6 (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting fs/proc/base.c:2750 [inline]
000000000058a1d6 (&sig->cred_guard_mutex){+.+.}, at: proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799

but task is already holding lock:
00000000c9e1d415 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #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
IPVS: ftp: loaded support on port[0] = 21
       __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]#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

-> #0 (&sig->cred_guard_mutex){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:937 [inline]
       __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
       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

other info that might help us debug this:

Chain exists of:
  &sig->cred_guard_mutex --> sb_writers#3 --> &p->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&p->lock);
                               lock(sb_writers#3);
                               lock(&p->lock);
  lock(&sig->cred_guard_mutex);

 *** DEADLOCK ***

2 locks held by syz-executor.4/22634:
 #0: 0000000006426a7e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
 #1: 00000000c9e1d415 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164

stack backtrace:
CPU: 1 PID: 22634 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0
netlink: 'syz-executor.0': attribute type 4 has an invalid length.
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
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
 __mutex_lock_common kernel/locking/mutex.c:937 [inline]
 __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
 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
RIP: 0033:0x7f761c4175a9
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:00007f761a98a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f761c537f80 RCX: 00007f761c4175a9
RDX: 0000000000002020 RSI: 0000000020000380 RDI: 0000000000000003
RBP: 00007f761c4727b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff8a530cff R14: 00007f761a98a300 R15: 0000000000022000
audit: type=1326 audit(1666749849.953:145): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=22671 comm="syz-executor.1" exe="/root/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f200865f5a9 code=0x0
IPVS: ftp: loaded support on port[0] = 21
netlink: 'syz-executor.0': attribute type 4 has an invalid length.
ptrace attach of "/root/syz-executor.1 exec"[8141] was attempted by "/root/syz-executor.1 exec"[22937]
IPVS: ftp: loaded support on port[0] = 21
autofs4:pid:22987:autofs_fill_super: could not open pipe file descriptor
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
overlayfs: failed to get inode (-116)
overlayfs: failed to get inode (-116)
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
audit: type=1804 audit(3824102816.840:146): pid=23087 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir2045981596/syzkaller.wISpTK/427/bus" dev="sda1" ino=13949 res=1
overlayfs: failed to get inode (-116)
overlayfs: failed to get inode (-116)
audit: type=1800 audit(3824102816.840:147): pid=23084 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=13951 res=0
audit: type=1804 audit(3824102816.840:148): pid=23084 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2472556055/syzkaller.InaklG/470/file0" dev="sda1" ino=13951 res=1
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
audit: type=1804 audit(3824102816.870:149): pid=23085 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir4087836458/syzkaller.zWLbt1/441/file1/bus" dev="loop3" ino=13 res=1
FS-Cache: Duplicate cookie detected
FS-Cache: O-cookie c=00000000f13d9510 [p=000000007006af11 fl=222 nc=0 na=1]
FS-Cache: O-cookie d=00000000e7a41821 n=00000000f96d318c
FS-Cache: O-key=[10] '34323934393736383338'
FS-Cache: N-cookie c=00000000d5df2d0e [p=000000007006af11 fl=2 nc=0 na=1]
FS-Cache: N-cookie d=00000000e7a41821 n=0000000081d69c0d
FS-Cache: N-key=[10] '34323934393736383338'
audit: type=1804 audit(3824102816.940:150): pid=23097 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir4087836458/syzkaller.zWLbt1/441/file1/bus" dev="loop3" ino=13 res=1
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
overlayfs: failed to get inode (-116)
overlayfs: failed to get inode (-116)
audit: type=1326 audit(3824102817.060:151): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=23098 comm="syz-executor.5" exe="/root/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f7d3ebae5a9 code=0x0
audit: type=1804 audit(3824102817.580:152): pid=23153 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir4087836458/syzkaller.zWLbt1/442/file1/bus" dev="loop3" ino=14 res=1
audit: type=1804 audit(3824102817.640:153): pid=23161 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir4087836458/syzkaller.zWLbt1/442/file1/bus" dev="loop3" ino=14 res=1
IPVS: ftp: loaded support on port[0] = 21
ISO 9660 Extensions: Microsoft Joliet Level 3
ISOFS: unable to read i-node block
isofs_fill_super: get root inode failed
audit: type=1804 audit(3824102818.030:154): pid=23220 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir4087836458/syzkaller.zWLbt1/443/file1/bus" dev="loop3" ino=15 res=1
FS-Cache: Duplicate cookie detected
FS-Cache: O-cookie c=000000009b6b578b [p=000000007006af11 fl=222 nc=0 na=1]
FS-Cache: O-cookie d=00000000e7a41821 n=000000007b962564
FS-Cache: O-key=[10] '34323934393736393137'
FS-Cache: N-cookie c=00000000f5d08782 [p=000000007006af11 fl=2 nc=0 na=1]
FS-Cache: N-cookie d=00000000e7a41821 n=000000006fd647e5
FS-Cache: N-key=[10] '34323934393736393137'
audit: type=1804 audit(3824102818.130:155): pid=23229 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir4087836458/syzkaller.zWLbt1/443/file1/bus" dev="loop3" ino=15 res=1
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.