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AJvYcCUqXHiyzKkgiI9BRa93GOwaTiz2DZJKm93SWyCHHxT2+b0jK5hNzc3f4BvtG44uguxohPKKpbHFv3WI160=@vger.kernel.org X-Gm-Message-State: AOJu0YxOocfoTh36QgQWkEKhXHpiqUC+vmxPI3k5QyoAcJcQEEtHU1N0 SnYCDxZ43CoRcfvuX7PFWKPh+uZ6ECsUruOD6lMEB1niAhmh2NyscBCN2RgO/MJYeZFFPjOOAFN WY8PZqw2oODKY9dBdXUnwjjOPKtFwcpbY1U1vwCpYGBZPwuaWTLe+IbE= X-Google-Smtp-Source: AGHT+IHYy3yW+6HP8hCc8HPYeMMubxPW9pXtzZATwe5FFZG93C3D1//z0YadJvPKNiUBQpDH5zq1TxhpUPTf7kQqgts60LBrnQW4 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a6d:b0:3a0:c820:c5f0 with SMTP id e9e14a558f8ab-3a4d59e4a51mr29677575ab.24.1729695362598; Wed, 23 Oct 2024 07:56:02 -0700 (PDT) Date: Wed, 23 Oct 2024 07:56:02 -0700 In-Reply-To: <20241023144129.39005-1-aha310510@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67190e82.050a0220.10f4f4.01ad.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] KASAN: null-ptr-deref Read in bch2_sb_set_upgrade_extra From: syzbot To: aha310510@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: null-ptr-deref Read in bch2_sb_set_upgrade_extra bcachefs (loop0): flagging btree freespace lost data error reading btree root freespace l=0: btree_node_read_error, fixing ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: null-ptr-deref in btree_node_fake fs/bcachefs/btree_types.h:622 [inline] BUG: KASAN: null-ptr-deref in have_stripes fs/bcachefs/sb-downgrade.c:146 [inline] BUG: KASAN: null-ptr-deref in bch2_sb_set_upgrade_extra+0x152/0x270 fs/bcachefs/sb-downgrade.c:161 Read of size 8 at addr 00000000000000b0 by task syz.0.15/5608 CPU: 0 UID: 0 PID: 5608 Comm: syz.0.15 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #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: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_report+0xe8/0x550 mm/kasan/report.c:491 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] btree_node_fake fs/bcachefs/btree_types.h:622 [inline] have_stripes fs/bcachefs/sb-downgrade.c:146 [inline] bch2_sb_set_upgrade_extra+0x152/0x270 fs/bcachefs/sb-downgrade.c:161 bch2_fs_recovery+0x25c4/0x39c0 fs/bcachefs/recovery.c:860 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1036 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2174 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f822957f79a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f822a311e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f822a311ef0 RCX: 00007f822957f79a RDX: 00000000200058c0 RSI: 0000000020000000 RDI: 00007f822a311eb0 RBP: 00000000200058c0 R08: 00007f822a311ef0 R09: 0000000000010000 R10: 0000000000010000 R11: 0000000000000246 R12: 0000000020000000 R13: 00007f822a311eb0 R14: 000000000000590f R15: 0000000020000140 ================================================================== Tested on: commit: c2ee9f59 KVM: selftests: Fix build on on non-x86 archi.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ master console output: https://syzkaller.appspot.com/x/log.txt?x=17c588a7980000 kernel config: https://syzkaller.appspot.com/x/.config?x=fc6f8ce8c5369043 dashboard link: https://syzkaller.appspot.com/bug?extid=b468b9fef56949c3b528 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Note: no patches were applied.