wallet: migratewallet crashes “Assertion `legacy_spkm’ failed” #32112

issue dergoegge openend this issue on March 21, 2025

dergoegge commented at 3:22 pm on March 21, 2025: member

migratewallet crashes on malformed wallet.dats which is unlikely to happen with wallets created by old Bitcoin Core versions but we should probably return an error to the user instead of crashing.

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 0wallet/wallet.cpp:4085 GetDescriptorsForLegacy: Assertion `legacy_spkm' failed.
 1AddressSanitizer:DEADLYSIGNAL
 2=================================================================
 3==2388446==ERROR: AddressSanitizer: ABRT on unknown address 0x0000002471de (pc 0x7fd9934f7eec bp 0x7fd98d9f26c0 sp 0x7fd98d9f0830 T5)
 4    [#0](/bitcoin-bitcoin/0/) 0x7fd9934f7eec  (/lib/x86_64-linux-gnu/libc.so.6+0x8aeec) (BuildId: 79005c16293efa45b441fed45f4f29b138557e9e)
 5    [#1](/bitcoin-bitcoin/1/) 0x7fd9934a8fb1 in raise (/lib/x86_64-linux-gnu/libc.so.6+0x3bfb1) (BuildId: 79005c16293efa45b441fed45f4f29b138557e9e)
 6    [#2](/bitcoin-bitcoin/2/) 0x7fd993493471 in abort (/lib/x86_64-linux-gnu/libc.so.6+0x26471) (BuildId: 79005c16293efa45b441fed45f4f29b138557e9e)
 7    [#3](/bitcoin-bitcoin/3/) 0x563bae137c5b in assertion_fail(std::basic_string_view<char, std::char_traits<char>>, int, std::basic_string_view<char, std::char_traits<char>>, std::basic_string_view<char, std::char_traits<char>>) /bitcoin/build_fuzz/src/util/./util/check.cpp:34:5
 8    [#4](/bitcoin-bitcoin/4/) 0x563bad5fb48d in wallet::LegacyDataSPKM*& inline_assertion_check<false, wallet::LegacyDataSPKM*&>(wallet::LegacyDataSPKM*&, char const*, int, char const*, char const*) /bitcoin/build_fuzz/src/wallet/./util/check.h:59:13
 9    [#5](/bitcoin-bitcoin/5/) 0x563bad5fb48d in wallet::CWallet::GetDescriptorsForLegacy(bilingual_str&) const /bitcoin/build_fuzz/src/wallet/./wallet/wallet.cpp:4085:10
10    [#6](/bitcoin-bitcoin/6/) 0x563bad607a1f in wallet::DoMigration(wallet::CWallet&, wallet::WalletContext&, bilingual_str&, wallet::MigrationResult&) /bitcoin/build_fuzz/src/wallet/./wallet/wallet.cpp:4305:48
11    [#7](/bitcoin-bitcoin/7/) 0x563bad61923d in wallet::MigrateLegacyToDescriptor(std::shared_ptr<wallet::CWallet>, std::__cxx11::basic_string<char, std::char_traits<char>, secure_allocator<char>> const&, wallet::WalletContext&, bool) /bitcoin/build_fuzz/src/wallet/./wallet/wallet.cpp:4538:23
12    [#8](/bitcoin-bitcoin/8/) 0x563bad61206b in wallet::MigrateLegacyToDescriptor(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, std::__cxx11::basic_string<char, std::char_traits<char>, secure_allocator<char>> const&, wallet::WalletContext&) /bitcoin/build_fuzz/src/wallet/./wallet/wallet.cpp:4468:12
13    [#9](/bitcoin-bitcoin/9/) 0x563bad3ec469 in wallet::migratewallet()::$_0::operator()(RPCHelpMan const&, JSONRPCRequest const&) const /bitcoin/build_fuzz/src/wallet/./wallet/rpc/wallet.cpp:802:49

maflcko added the label Wallet on Mar 21, 2025

davidgumberg commented at 6:48 am on March 25, 2025: contributor

Just to add context, the crash is on an Assume() so it can’t happen in a production build, where an unhelpful error message is printed when this happens.

This should be caught by BerkeleyRODatabase::Open() which makes efforts to validate the database files on disk during WalletDatabase construction, and if it caught this would result in the more helpful message: “Wallet file verification failed.”

I reproduced this issue in the following manner on a Release build of master (1d281daf8613a):

0BAD_DAT="AAAAAAEAAAAAAAAAYjEFAAkAAAAAEAAAAAkAAAAAAAADAAAAAAAAAAAAAAAAAAAAIAAAAHsA+AEBAwEAQ0PCvWvWAgAAAAAAAAAAAAIAAAAAAAAAIAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADe////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA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1mkdir -p /tmp/temp_datadir/regtest/bad_wallet
2echo $BAD_DAT | base64 -d > /tmp/temp_datadir/regtest/bad_wallet/wallet.dat
3
4./build/bin/bitcoind -regtest -datadir=/tmp/temp_datadir -daemonwait
5./build/bin/bitcoin-cli -regtest -datadir=/tmp/temp_datadir migratewallet bad_wallet

And the following error message is printed (but the node is still running)

0error code: -4
1error message:
2Internal bug detected: Error: Legacy wallet data missing
3../../../src/wallet/wallet.cpp:4089 (GetDescriptorsForLegacy)
4Bitcoin Core v29.99.0-1d281daf8613
5Please report this issue here: https://github.com/bitcoin/bitcoin/issues

BerkeleyDB 5.3.28’s db_verify tool reports the following issues with the file:

0$ db_verify /tmp/temp_datadir/regtest/bad_wallet/wallet.dat
1db_verify: BDB3037 /tmp/temp_datadir/regtest/bad_wallet/wallet.dat: file size not a multiple of the pagesize
2db_verify: BDB0567 Page 3: item 4 extends past page boundary
3db_verify: BDB0567 Page 3: item 8 extends past page boundary
4db_verify: BDB1059 Page 3: gap between items at offset 3980
5db_verify: BDB1059 Page 3: gap between items at offset 4012
6db_verify: BDB1045 Page 3: item order check unsafe: skipping
7db_verify: /tmp/temp_datadir/regtest/bad_wallet/wallet.dat: BDB0090 DB_VERIFY_BAD: Database verification failed
8BDB5105 Verification of /tmp/temp_datadir/regtest/bad_wallet/wallet.dat failed.

Contributors
dergoegge davidgumberg

Labels
Wallet