Hello, syzbot found the following issue on: HEAD commit: 4d939780b705 Merge tag 'mm-hotfixes-stable-2024-10-17-16-0.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=169f4c5f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=164d2822debd8b0d dashboard link: https://syzkaller.appspot.com/bug?extid=4125a3c514e3436a02e6 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=1374d830580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cbc7a4f0dff1/disk-4d939780.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/21165b36b232/vmlinux-4d939780.xz kernel image: https://storage.googleapis.com/syzbot-assets/8e42c5595828/bzImage-4d939780.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/9171ce715585/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/faf0b43468d6/mount_2.gz mounted in repro #3: https://storage.googleapis.com/syzbot-assets/12ac0c5a53d1/mount_14.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4125a3c514e3436a02e6@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: null-ptr-deref in atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline] BUG: KASAN: null-ptr-deref in xfs_filestream_create_association fs/xfs/xfs_filestream.c:320 [inline] BUG: KASAN: null-ptr-deref in xfs_filestream_select_ag+0x13ed/0x1d80 fs/xfs/xfs_filestream.c:371 Write of size 4 at addr 0000000000000010 by task syz.1.56/5898 CPU: 0 UID: 0 PID: 5898 Comm: syz.1.56 Not tainted 6.12.0-rc3-syzkaller-00217-g4d939780b705 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __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_write include/linux/instrumented.h:96 [inline] atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline] xfs_filestream_create_association fs/xfs/xfs_filestream.c:320 [inline] xfs_filestream_select_ag+0x13ed/0x1d80 fs/xfs/xfs_filestream.c:371 xfs_bmap_btalloc_filestreams fs/xfs/libxfs/xfs_bmap.c:3657 [inline] xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3774 [inline] xfs_bmapi_allocate+0x162d/0x3450 fs/xfs/libxfs/xfs_bmap.c:4189 xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4697 [inline] xfs_bmapi_convert_delalloc+0x9a0/0x1970 fs/xfs/libxfs/xfs_bmap.c:4752 xfs_map_blocks+0x7b7/0x1050 fs/xfs/xfs_aops.c:363 iomap_writepage_map_blocks fs/iomap/buffered-io.c:1855 [inline] iomap_writepage_map fs/iomap/buffered-io.c:2003 [inline] iomap_writepages+0xd49/0x2ac0 fs/iomap/buffered-io.c:2057 xfs_vm_writepages+0xfc/0x150 fs/xfs/xfs_aops.c:477 do_writepages+0x35d/0x870 mm/page-writeback.c:2683 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:398 __filemap_fdatawrite_range mm/filemap.c:431 [inline] file_write_and_wait_range+0x195/0x280 mm/filemap.c:788 xfs_file_fsync+0x1d3/0xa80 fs/xfs/xfs_file.c:138 generic_write_sync include/linux/fs.h:2871 [inline] xfs_file_buffered_write+0x9a8/0xac0 fs/xfs/xfs_file.c:799 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xa6d/0xc90 fs/read_write.c:683 ksys_write+0x183/0x2b0 fs/read_write.c:736 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: 0033:0x7f11d7b7dff9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f11d75de038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f11d7d36208 RCX: 00007f11d7b7dff9 RDX: 0000000000000048 RSI: 0000000020020cc0 RDI: 0000000000000004 RBP: 00007f11d7bf0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f11d7d36208 R15: 00007ffcddfd4a88 </TASK> ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
