I'm seeing a deadlock on Trunk @ commit 523828.

The main thread is waiting on initializing the libsecret key storage on a background thread:

0  pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ffff7823970 in base::ConditionVariable::Wait (this=0x7fffffff4ae8)
    at ../../base/synchronization/condition_variable_posix.cc:71
#2  0x00007ffff78255d9 in base::WaitableEvent::TimedWaitUntil (
    this=0x7fffffff4d80, end_time=106751991 days, 4:00:54.775807)
    at ../../base/synchronization/waitable_event_posix.cc:223
#3  0x00007ffff782526c in base::WaitableEvent::Wait (this=0x7fffffff4d80)
    at ../../base/synchronization/waitable_event_posix.cc:154
#4  0x00005555597c01a9 in KeyStorageLinux::WaitForInitOnTaskRunner (
    this=0x2bd27f5004e0) at ../../components/os_crypt/key_storage_linux.cc:120
#5  0x00005555597bed7c in KeyStorageLinux::CreateService (config=...)
    at ../../components/os_crypt/key_storage_linux.cc:60
#6  0x00005555597bde1f in (anonymous namespace)::CreateKeyStorage ()
    at ../../components/os_crypt/os_crypt_linux.cc:74
#7  0x00005555597be2ad in (anonymous namespace)::GetPasswordV11 ()
    at ../../components/os_crypt/os_crypt_linux.cc:98
#8  0x00005555597bd11c in (anonymous namespace)::GetEncryptionKey (
    version=(anonymous namespace)::V11)
    at ../../components/os_crypt/os_crypt_linux.cc:118
#9  0x00005555597bccf7 in OSCrypt::DecryptString (ciphertext=..., 
    plaintext=0x7fffffff6638)
    at ../../components/os_crypt/os_crypt_linux.cc:211
#10 0x000055555b47e561 in password_manager::HashPasswordManager::RetrivedDecryptedStringFromPrefs (this=0x2bd27fe9adf8, pref_name=...)
    at ../../components/password_manager/core/browser/hash_password_manager.cc:131

#11 0x000055555b47d614 in password_manager::HashPasswordManager::RetrievePasswordHash (this=0x2bd27fe9adf8)
    at ../../components/password_manager/core/browser/hash_password_manager.cc:59
#12 0x000055555b402408 in password_manager::PasswordStore::Init(base::RepeatingCallback<void (syncer::ModelType)> const&, PrefService*) (this=0x2bd27fe9ada0, 
    flare=..., prefs=0x2bd27ec27920)
    at ../../components/password_manager/core/browser/password_store.cc:129

#13 0x00005555587ec8b3 in PasswordStoreFactory::BuildServiceInstanceFor (
    this=0x2bd27e341020, context=0x2bd27e0dede0)
    at ../../chrome/browser/password_manager/password_store_factory.cc:255
#14 0x00007fffeb3f0a66 in RefcountedBrowserContextKeyedServiceFactory::BuildServiceInstanceFor (this=0x2bd27e341020, context=0x2bd27e0dede0)
    at ../../components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc:91
#15 0x00007fffec17389a in RefcountedKeyedServiceFactory::GetServiceForContext (
    this=0x2bd27e341020, context=0x2bd27e0dede0, create=true)
    at ../../components/keyed_service/core/refcounted_keyed_service_factory.cc:88
#16 0x00007fffeb3f083e in RefcountedBrowserContextKeyedServiceFactory::GetServiceForBrowserContext (this=0x2bd27e341020, context=0x2bd27e0dede0, create=true)
    at ../../components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc:52
#17 0x00005555587eb0dd in PasswordStoreFactory::GetForProfile (profile=
    0x2bd27e0dede0, access_type=ServiceAccessType::IMPLICIT_ACCESS)
    at ../../chrome/browser/password_manager/password_store_factory.cc:83
#18 0x0000555558af7e18 in browser_sync::ChromeSyncClient::Initialize (
    this=0x2bd27fe8cb80) at ../../chrome/browser/sync/chrome_sync_client.cc:223
#19 0x000055555b71707b in browser_sync::ProfileSyncService::Initialize (
    this=0x2bd27eb46020)
    at ../../components/browser_sync/profile_sync_service.cc:218
#20 0x0000555558b014cc in ProfileSyncServiceFactory::BuildServiceInstanceFor (
    this=0x2bd27e341290, context=0x2bd27e0dede0)
    at ../../chrome/browser/sync/profile_sync_service_factory.cc:251
#21 0x00007fffeb3ee02a in BrowserContextKeyedServiceFactory::BuildServiceInstanceFor (this=0x2bd27e341290, context=0x2bd27e0dede0)
    at ../../components/keyed_service/content/browser_context_keyed_service_factory.cc:98
#22 0x00007fffec16c627 in KeyedServiceFactory::GetServiceForContext (
    this=0x2bd27e341290, context=0x2bd27e0dede0, create=true)
    at ../../components/keyed_service/core/keyed_service_factory.cc:89
#23 0x00007fffeb3eddd7 in BrowserContextKeyedServiceFactory::GetServiceForBrowserContext (this=0x2bd27e341290, context=0x2bd27e0dede0, create=true)
    at ../../components/keyed_service/content/browser_context_keyed_service_factory.cc:51
#24 0x0000555558b000fc in ProfileSyncServiceFactory::GetSyncServiceForBrowserContext (context=0x2bd27e0dede0)
    at ../../chrome/browser/sync/profile_sync_service_factory.cc:117
#25 0x0000555558b000b5 in ProfileSyncServiceFactory::GetForProfile (
    profile=0x2bd27e0dede0)
    at ../../chrome/browser/sync/profile_sync_service_factory.cc:106
#26 0x0000555558f00e91 in SupervisedUserService::Init (this=0x2bd27ec22020)
    at ../../chrome/browser/supervised_user/supervised_user_service.cc:196
#27 0x0000555558a248ef in ProfileManager::DoFinalInitForServices (
    this=0x2bd27e75c620, profile=0x2bd27e0dede0, go_off_the_record=false)
    at ../../chrome/browser/profiles/profile_manager.cc:1257
#28 0x0000555558a24653 in ProfileManager::DoFinalInit (this=0x2bd27e75c620, 
    profile=0x2bd27e0dede0, go_off_the_record=false)
    at ../../chrome/browser/profiles/profile_manager.cc:1209
#29 0x0000555558a263db in ProfileManager::AddProfile (this=0x2bd27e75c620, 
    profile=0x2bd27e0dede0)


The libsecret code does not run. The background thread it wants seems to run on is blocked on previous work. I believe it's this one:

#0  __lll_lock_wait ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007ffff7bc6649 in _L_lock_909 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007ffff7bc6470 in __GI___pthread_mutex_lock (
    mutex=0x55555da61960 <(anonymous namespace)::g_cache+48>)
    at ../nptl/pthread_mutex_lock.c:79
#3  0x00007ffff7824b21 in base::internal::LockImpl::Lock (
    this=0x55555da61960 <(anonymous namespace)::g_cache+48>)
    at ../../base/synchronization/lock_impl_posix.cc:73
#4  0x00005555570012b3 in base::Lock::Acquire (
    this=0x55555da61958 <(anonymous namespace)::g_cache+40>)
    at ../../base/synchronization/lock.h:45
#5  0x0000555557000e33 in base::AutoLock::AutoLock (this=0x7fffbad56e90, 
    lock=Unknown state) at ../../base/synchronization/lock.h:115
#6  0x00005555597be28a in (anonymous namespace)::GetPasswordV11 ()
    at ../../components/os_crypt/os_crypt_linux.cc:96
#7  0x00005555597bd11c in (anonymous namespace)::GetEncryptionKey (
    version=(anonymous namespace)::V11)
    at ../../components/os_crypt/os_crypt_linux.cc:118
#8  0x00005555597bccf7 in OSCrypt::DecryptString (ciphertext=..., 
    plaintext=0x7fffbad57688)
    at ../../components/os_crypt/os_crypt_linux.cc:211
#9  0x0000555559847ec9 in TokenServiceTable::GetAllTokens (
    this=0x3194467fd930, tokens=0x7fffbad57e28)
    at ../../components/signin/core/browser/webdata/token_service_table.cc:124
#10 0x00005555598457cb in TokenWebDataBackend::GetAllTokens (
    this=0x3194467f8a70, db=0x31944671f5c0)
    at ../../components/signin/core/browser/webdata/token_web_data.cc:53

This background thread is blocked waiting for the os_crypt_linux.cc g_cache.lock.

This lock is held by the main thread GetPasswordV11 (frame #7).

Possibly related to https://chromium-review.googlesource.com/c/chromium/src/+/815055