======================================================
WARNING: possible circular locking dependency detected
6.2.0-rc3-syzkaller-00014-g40c18f363a08 #0 Not tainted
------------------------------------------------------
syz-executor.3/9615 is trying to acquire lock:
ffff88801bda11a0 (&iint->mutex){+.+.}-{3:3}, at: process_measurement+0x3ab/0x18b0 security/integrity/ima/ima_main.c:260

but task is already holding lock:
ffff88801ba56460 (sb_writers#5){.+.+}-{0:0}, at: do_open fs/namei.c:3550 [inline]
ffff88801ba56460 (sb_writers#5){.+.+}-{0:0}, at: path_openat+0x19b3/0x2a50 fs/namei.c:3714

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (sb_writers#5){.+.+}-{0:0}:
       percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
       __sb_start_write include/linux/fs.h:1814 [inline]
       sb_start_write include/linux/fs.h:1889 [inline]
       mnt_want_write+0x70/0x3e0 fs/namespace.c:508
       ovl_maybe_copy_up+0x123/0x190 fs/overlayfs/copy_up.c:1121
       ovl_open+0xf5/0x2e0 fs/overlayfs/file.c:153
       do_dentry_open+0x6cc/0x13f0 fs/open.c:882
       vfs_open fs/open.c:1013 [inline]
       dentry_open+0x136/0x1d0 fs/open.c:1029
       ima_calc_file_hash+0x2ca/0x4a0 security/integrity/ima/ima_crypto.c:558
       ima_collect_measurement+0x642/0x7b0 security/integrity/ima/ima_api.c:292
       process_measurement+0xd23/0x18b0 security/integrity/ima/ima_main.c:339
       ima_file_check+0xb0/0x100 security/integrity/ima/ima_main.c:519
       do_open fs/namei.c:3559 [inline]
       path_openat+0x15f1/0x2a50 fs/namei.c:3714
       do_filp_open+0x1ba/0x410 fs/namei.c:3741
       do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
       do_sys_open fs/open.c:1326 [inline]
       __do_sys_open fs/open.c:1334 [inline]
       __se_sys_open fs/open.c:1330 [inline]
       __x64_sys_open+0x11d/0x1c0 fs/open.c:1330
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&iint->mutex){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3097 [inline]
       check_prevs_add kernel/locking/lockdep.c:3216 [inline]
       validate_chain kernel/locking/lockdep.c:3831 [inline]
       __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
       lock_acquire kernel/locking/lockdep.c:5668 [inline]
       lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
       process_measurement+0x3ab/0x18b0 security/integrity/ima/ima_main.c:260
       ima_file_check+0xb0/0x100 security/integrity/ima/ima_main.c:519
       do_open fs/namei.c:3559 [inline]
       path_openat+0x15f1/0x2a50 fs/namei.c:3714
       do_filp_open+0x1ba/0x410 fs/namei.c:3741
       do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
       do_sys_open fs/open.c:1326 [inline]
       __do_sys_openat fs/open.c:1342 [inline]
       __se_sys_openat fs/open.c:1337 [inline]
       __x64_sys_openat+0x143/0x1f0 fs/open.c:1337
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sb_writers#5);
                               lock(&iint->mutex);
                               lock(sb_writers#5);
  lock(&iint->mutex);

 *** DEADLOCK ***

1 lock held by syz-executor.3/9615:
 #0: ffff88801ba56460 (sb_writers#5){.+.+}-{0:0}, at: do_open fs/namei.c:3550 [inline]
 #0: ffff88801ba56460 (sb_writers#5){.+.+}-{0:0}, at: path_openat+0x19b3/0x2a50 fs/namei.c:3714

stack backtrace:
CPU: 2 PID: 9615 Comm: syz-executor.3 Not tainted 6.2.0-rc3-syzkaller-00014-g40c18f363a08 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177
 check_prev_add kernel/locking/lockdep.c:3097 [inline]
 check_prevs_add kernel/locking/lockdep.c:3216 [inline]
 validate_chain kernel/locking/lockdep.c:3831 [inline]
 __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
 lock_acquire kernel/locking/lockdep.c:5668 [inline]
 lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
 process_measurement+0x3ab/0x18b0 security/integrity/ima/ima_main.c:260
 ima_file_check+0xb0/0x100 security/integrity/ima/ima_main.c:519
 do_open fs/namei.c:3559 [inline]
 path_openat+0x15f1/0x2a50 fs/namei.c:3714
 do_filp_open+0x1ba/0x410 fs/namei.c:3741
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0x143/0x1f0 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f96dce8c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007f96ddb7c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f96dcfabf80 RCX: 00007f96dce8c0c9
RDX: 000000000000275a RSI: 0000000020000100 RDI: ffffffffffffff9c
RBP: 00007f96dcee7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc248c764f R14: 00007f96ddb7c300 R15: 0000000000022000
 </TASK>