linux-kernel - [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in bch2_bkey_format

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Message-ID: <00000000000089ded8061a829247@google.com>
Date: Sun, 09 Jun 2024 22:39:26 -0700
From: syzbot <syzbot+e5292b50f1957164a4b6@...kaller.appspotmail.com>
To: bfoster@...hat.com, kent.overstreet@...ux.dev, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in
 bch2_bkey_format_invalid (2)

Hello,

syzbot found the following issue on:

HEAD commit:    8867bbd4a056 mm: arm64: Fix the out-of-bounds issue in con..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=13fc4362980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3b4350cf56c61c80
dashboard link: https://syzkaller.appspot.com/bug?extid=e5292b50f1957164a4b6
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15a262ce980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15dc0cba980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6ea21f50498b/disk-8867bbd4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e2fed09364aa/vmlinux-8867bbd4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4860173c7a18/Image-8867bbd4.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/662edb25db9f/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e5292b50f1957164a4b6@...kaller.appspotmail.com

bcachefs (loop0): mounting version 1.7: mi_btree_bitmap opts=ro,metadata_checksum=none,data_checksum=xxhash,compression=zstd,nojournal_transaction_names,read_only
bcachefs (loop0): recovering from clean shutdown, journal seq 10
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/bcachefs/bkey.c:664:22
shift exponent 64 is too large for 64-bit type 'unsigned long long'
CPU: 0 PID: 6246 Comm: syz-executor702 Tainted: G        W          6.10.0-rc2-syzkaller-g8867bbd4a056 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 dump_stack+0x1c/0x28 lib/dump_stack.c:123
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x2f4/0x36c lib/ubsan.c:468
 bch2_bkey_format_invalid+0x6a0/0x6e0 fs/bcachefs/bkey.c:664
 validate_bset+0x10ec/0x1d24 fs/bcachefs/btree_io.c:822
 bch2_btree_node_read_done+0x16f0/0x4ac8 fs/bcachefs/btree_io.c:1140
 btree_node_read_work+0x50c/0xe04 fs/bcachefs/btree_io.c:1345
 bch2_btree_node_read+0x1f4c/0x2818 fs/bcachefs/btree_io.c:1730
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1769 [inline]
 bch2_btree_root_read+0x2a8/0x534 fs/bcachefs/btree_io.c:1793
 read_btree_roots+0x21c/0x730 fs/bcachefs/recovery.c:475
 bch2_fs_recovery+0x31c4/0x5488 fs/bcachefs/recovery.c:803
 bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1031
 bch2_fs_open+0x8b4/0xb64 fs/bcachefs/super.c:2123
 bch2_mount+0x4fc/0xe18 fs/bcachefs/fs.c:1917
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662
 vfs_get_tree+0x90/0x288 fs/super.c:1780
 do_new_mount+0x278/0x900 fs/namespace.c:3352
 path_mount+0x590/0xe04 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3875
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
---[ end trace ]---
bcachefs (loop0): inconsistency detected - emergency read only at journal seq 10
bcachefs (loop0): flagging btree alloc lost data
error reading btree root alloc l=0: btree_node_read_error, shutting down
bcachefs (loop0): bch2_fs_recovery(): error fsck_errors_not_fixed
bcachefs (loop0): bch2_fs_start(): error starting filesystem fsck_errors_not_fixed
bcachefs (loop0): shutting down
bcachefs (loop0): shutdown complete


---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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