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

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Message-ID: <66fd2663.050a0220.f28ec.0510.GAE@google.com>
Date: Wed, 02 Oct 2024 03:54:27 -0700
From: syzbot <syzbot+9f41e4b255897d99d4e9@...kaller.appspotmail.com>
To: 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 __btree_node_pinned

Hello,

syzbot found the following issue on:

HEAD commit:    ad46e8f95e93 Merge tag 'pm-6.12-rc1-2' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13b3d507980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=62086b2fd100a029
dashboard link: https://syzkaller.appspot.com/bug?extid=9f41e4b255897d99d4e9
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11b69e80580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1567c6a9980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-ad46e8f9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/72b7539cbeb1/vmlinux-ad46e8f9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/73c9b9cebaf4/bzImage-ad46e8f9.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/54e2032c8f9d/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9f41e4b255897d99d4e9@...kaller.appspotmail.com

------------[ cut here ]------------
UBSAN: shift-out-of-bounds in fs/bcachefs/btree_cache.c:198:18
shift exponent 227 is too large for 64-bit type 'unsigned long long'
CPU: 0 UID: 0 PID: 5109 Comm: read_btree_node Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 __btree_node_pinned+0x80b/0x850 fs/bcachefs/btree_cache.c:198
 __bch2_btree_node_hash_insert+0xcfd/0x13e0 fs/bcachefs/btree_cache.c:270
 bch2_btree_node_hash_insert fs/bcachefs/btree_cache.c:287 [inline]
 bch2_btree_node_fill+0x94e/0x1200 fs/bcachefs/btree_cache.c:932
 bch2_btree_node_get_noiter+0x9d5/0xf70 fs/bcachefs/btree_cache.c:1238
 found_btree_node_is_readable fs/bcachefs/btree_node_scan.c:85 [inline]
 try_read_btree_node fs/bcachefs/btree_node_scan.c:190 [inline]
 read_btree_nodes_worker+0x122c/0x20b0 fs/bcachefs/btree_node_scan.c:239
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
---[ end trace ]---
Kernel panic - not syncing: UBSAN: panic_on_warn set ...
CPU: 0 UID: 0 PID: 5109 Comm: read_btree_node Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 panic+0x349/0x880 kernel/panic.c:354
 check_panic_on_warn+0x86/0xb0 kernel/panic.c:243
 ubsan_epilogue lib/ubsan.c:236 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3e7/0x420 lib/ubsan.c:468
 __btree_node_pinned+0x80b/0x850 fs/bcachefs/btree_cache.c:198
 __bch2_btree_node_hash_insert+0xcfd/0x13e0 fs/bcachefs/btree_cache.c:270
 bch2_btree_node_hash_insert fs/bcachefs/btree_cache.c:287 [inline]
 bch2_btree_node_fill+0x94e/0x1200 fs/bcachefs/btree_cache.c:932
 bch2_btree_node_get_noiter+0x9d5/0xf70 fs/bcachefs/btree_cache.c:1238
 found_btree_node_is_readable fs/bcachefs/btree_node_scan.c:85 [inline]
 try_read_btree_node fs/bcachefs/btree_node_scan.c:190 [inline]
 read_btree_nodes_worker+0x122c/0x20b0 fs/bcachefs/btree_node_scan.c:239
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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