======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/16867 is trying to acquire lock:
00000000f8c7243c (&sig->cred_guard_mutex){+.+.}, at: lock_trace fs/proc/base.c:402 [inline]
00000000f8c7243c (&sig->cred_guard_mutex){+.+.}, at: proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938

but task is already holding lock:
00000000bf4b5c6a (&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
       __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
       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
       __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.1/16867:
 #0: 00000000d793ae97 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
 #1: 00000000bf4b5c6a (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164

stack backtrace:
CPU: 1 PID: 16867 Comm: syz-executor.1 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
 __mutex_lock_common kernel/locking/mutex.c:937 [inline]
 __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
 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
 __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: 0033:0x7f1be0f970e9
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:00007f1bdf90c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f1be10a9f60 RCX: 00007f1be0f970e9
RDX: 00000000000000fe RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f1be0ff108d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffea9d39c0f R14: 00007f1bdf90c300 R15: 0000000000022000
audit: type=1400 audit(1650752078.013:590): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name=02ACB638ADF2677DFCF8E4984070D71AF14C2D78D293E40CC79AF1FE67522E75D233383A562816397634A8BEBB4A08A7DEAA1B3E260A5F9D34EA01F80174B8E4805B7397D55F1B500982697E pid=17010 comm="syz-executor.3"
QAT: failed to copy from user cfg_data.
QAT: failed to copy from user cfg_data.
audit: type=1400 audit(1650752078.123:591): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name="'[&$" pid=17026 comm="syz-executor.5"
QAT: failed to copy from user.
audit: type=1400 audit(1650752078.133:592): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name=02ACB638ADF2677DFCF8E4984070D71AF14C2D78D293E40CC79AF1FE67522E75D233383A562816397634A8BEBB4A08A7DEAA1B3E260A5F9D34EA01F80174B8E4805B7397D55F1B500982697E pid=17027 comm="syz-executor.3"
QAT: failed to copy from user cfg_data.
base_sock_release(00000000fcdcef5e) sk=000000005a34bf11
QAT: failed to copy from user cfg_data.
audit: type=1400 audit(1650752078.213:593): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name="'[&$" pid=17043 comm="syz-executor.5"
audit: type=1400 audit(1650752078.233:594): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name=02ACB638ADF2677DFCF8E4984070D71AF14C2D78D293E40CC79AF1FE67522E75D233383A562816397634A8BEBB4A08A7DEAA1B3E260A5F9D34EA01F80174B8E4805B7397D55F1B500982697E pid=17044 comm="syz-executor.3"
audit: type=1400 audit(1650752078.323:595): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name="'[&$" pid=17056 comm="syz-executor.5"
audit: type=1400 audit(1650752078.333:596): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name=02ACB638ADF2677DFCF8E4984070D71AF14C2D78D293E40CC79AF1FE67522E75D233383A562816397634A8BEBB4A08A7DEAA1B3E260A5F9D34EA01F80174B8E4805B7397D55F1B500982697E pid=17061 comm="syz-executor.3"
vhci_hcd vhci_hcd.0: pdev(3) rhport(0) sockfd(3)
vhci_hcd vhci_hcd.0: devid(0) speed(4) speed_str(wireless)
vhci_hcd vhci_hcd.0: Device attached
vhci_hcd: connection closed
vhci_hcd: stop threads
vhci_hcd: release socket
vhci_hcd: disconnect device
audit: type=1400 audit(1650752078.453:597): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name="'[&$" pid=17071 comm="syz-executor.5"
caif:caif_disconnect_client(): nothing to disconnect
vhci_hcd vhci_hcd.0: pdev(3) rhport(0) sockfd(3)
vhci_hcd vhci_hcd.0: devid(0) speed(4) speed_str(wireless)
vhci_hcd vhci_hcd.0: Device attached
vhci_hcd: connection closed
vhci_hcd: stop threads
vhci_hcd: release socket
vhci_hcd: disconnect device
vhci_hcd vhci_hcd.0: pdev(3) rhport(0) sockfd(3)
vhci_hcd vhci_hcd.0: devid(0) speed(4) speed_str(wireless)
vhci_hcd vhci_hcd.0: Device attached
vhci_hcd: connection closed
vhci_hcd: stop threads
vhci_hcd: release socket
vhci_hcd: disconnect device
netlink: 152 bytes leftover after parsing attributes in process `syz-executor.4'.
vhci_hcd vhci_hcd.0: pdev(3) rhport(0) sockfd(3)
vhci_hcd vhci_hcd.0: devid(0) speed(4) speed_str(wireless)
vhci_hcd vhci_hcd.0: Device attached
vhci_hcd: connection closed
vhci_hcd: stop threads
vhci_hcd: release socket
vhci_hcd: disconnect device
usb usb2: usbfs: process 17290 (syz-executor.1) did not claim interface 0 before use
audit: type=1400 audit(1650752082.114:598): apparmor="DENIED" operation="change_profile" info="label not found" error=-2 profile="unconfined" name=AF7B7D5E213A5D3C643F4A53C83E85 pid=17380 comm="syz-executor.4"
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
list_del corruption, ffff88804fe4fa90->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:45!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 17609 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid.cold+0x23/0x4a lib/list_debug.c:45
Code: e8 11 43 f7 ff 0f 0b 48 89 ee 48 c7 c7 40 e4 b3 88 e8 00 43 f7 ff 0f 0b 4c 89 ea 48 89 ee 48 c7 c7 80 e3 b3 88 e8 ec 42 f7 ff <0f> 0b 4c 89 e2 48 89 ee 48 c7 c7 e0 e3 b3 88 e8 d8 42 f7 ff 0f 0b
RSP: 0018:ffff88804fe4f970 EFLAGS: 00010086
RAX: 000000000000004e RBX: ffff88804fe4fa78 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff814dff01 RDI: ffffed1009fc9f20
RBP: ffff88804fe4fa90 R08: 000000000000004e R09: 0000000000000000
R10: 0000000000000005 R11: ffffffff8c66501b R12: dead000000000200
R13: dead000000000100 R14: ffff88804fe4fa98 R15: 0000000000000007
FS:  00007f51e0d5a700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c009ded740 CR3: 00000000b2e36000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 __remove_wait_queue include/linux/wait.h:184 [inline]
 remove_wait_queue+0x2c/0x180 kernel/sched/wait.c:44
 __tipc_sendstream+0x373/0x9d0 net/tipc/socket.c:1449
 tipc_sendstream+0x4c/0x70 net/tipc/socket.c:1414
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 sock_write_iter+0x287/0x3c0 net/socket.c:966
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f51e24060e9
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:00007f51e0d5a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f51e2519030 RCX: 00007f51e24060e9
RDX: 00000000fffffd6d RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00007f51e246008d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffa7fb864f R14: 00007f51e0d5a300 R15: 0000000000022000
Modules linked in:
---[ end trace 9ac90ce199fd2902 ]---
RIP: 0010:__list_del_entry_valid.cold+0x23/0x4a lib/list_debug.c:45
Code: e8 11 43 f7 ff 0f 0b 48 89 ee 48 c7 c7 40 e4 b3 88 e8 00 43 f7 ff 0f 0b 4c 89 ea 48 89 ee 48 c7 c7 80 e3 b3 88 e8 ec 42 f7 ff <0f> 0b 4c 89 e2 48 89 ee 48 c7 c7 e0 e3 b3 88 e8 d8 42 f7 ff 0f 0b
RSP: 0018:ffff88804fe4f970 EFLAGS: 00010086
RAX: 000000000000004e RBX: ffff88804fe4fa78 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff814dff01 RDI: ffffed1009fc9f20
RBP: ffff88804fe4fa90 R08: 000000000000004e R09: 0000000000000000
R10: 0000000000000005 R11: ffffffff8c66501b R12: dead000000000200
R13: dead000000000100 R14: ffff88804fe4fa98 R15: 0000000000000007
FS:  00007f51e0d5a700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c009ded740 CR3: 00000000b2e36000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600