syzbot has found a reproducer for the following issue on: HEAD commit: b6dad5178cea Merge tag 'nios2_fix_v6.4' of git://git.kerne.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1495dce3280000 kernel config: https://syzkaller.appspot.com/x/.config?x=ac246111fb601aec dashboard link: https://syzkaller.appspot.com/bug?extid=5184326923f180b9d11a compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10bbc887280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c9558b280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fb7aeb21864c/disk-b6dad517.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3004476364b7/vmlinux-b6dad517.xz kernel image: https://storage.googleapis.com/syzbot-assets/a143be294854/bzImage-b6dad517.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/92adf3c12845/mount_1.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/3861119d1700/mount_8.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5184326923f180b9d11a@xxxxxxxxxxxxxxxxxxxxxxxxx REISERFS error (device loop2): vs-5150 search_by_key: invalid format found in block 540. Fsck? ================================================================== 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 buffer_locked include/linux/buffer_head.h:126 [inline] BUG: KASAN: null-ptr-deref in fix_nodes+0x464/0x8660 fs/reiserfs/fix_node.c:2578 Read of size 8 at addr 0000000000000000 by task syz-executor539/5535 CPU: 0 PID: 5535 Comm: syz-executor539 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_report mm/kasan/report.c:465 [inline] kasan_report+0xec/0x130 mm/kasan/report.c:572 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:187 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] buffer_locked include/linux/buffer_head.h:126 [inline] fix_nodes+0x464/0x8660 fs/reiserfs/fix_node.c:2578 reiserfs_cut_from_item+0x2bd/0x1b20 fs/reiserfs/stree.c:1740 reiserfs_do_truncate+0x630/0x1080 fs/reiserfs/stree.c:1971 reiserfs_truncate_file+0x1b5/0x1070 fs/reiserfs/inode.c:2308 reiserfs_setattr+0xddf/0x1370 fs/reiserfs/inode.c:3393 notify_change+0xb2c/0x1180 fs/attr.c:483 do_truncate+0x143/0x200 fs/open.c:66 handle_truncate fs/namei.c:3295 [inline] do_open fs/namei.c:3640 [inline] path_openat+0x2083/0x2750 fs/namei.c:3791 do_filp_open+0x1ba/0x410 fs/namei.c:3818 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_open fs/open.c:1380 [inline] __se_sys_open fs/open.c:1376 [inline] __x64_sys_open+0x11d/0x1c0 fs/open.c:1376 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f7cb89c3be9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7cb094e2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f7cb8a497f0 RCX: 00007f7cb89c3be9 RDX: 0000000000000000 RSI: 000000000014937e RDI: 0000000020000180 RBP: 00007f7cb8a16410 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000010f7 R11: 0000000000000246 R12: 0030656c69662f2e R13: 7366726573696572 R14: 6bd71a7077694d3f R15: 00007f7cb8a497f8 </TASK> ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
