Hello, syzbot found the following issue on: HEAD commit: 69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=145b6d18580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d033b14aeef39158 dashboard link: https://syzkaller.appspot.com/bug?extid=07392c132f11b1758ac3 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=160983df980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-69e858e0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a53b888c1f3f/vmlinux-69e858e0.xz kernel image: https://storage.googleapis.com/syzbot-assets/6b5e17edafc0/bzImage-69e858e0.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/dfc78a0e5edb/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+07392c132f11b1758ac3@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in lib/xarray.c:196:22 shift exponent 66 is too large for 64-bit type 'unsigned long' CPU: 0 UID: 0 PID: 5744 Comm: syz.3.50 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #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 xas_start+0x772/0x7b0 lib/xarray.c:196 xas_find_conflict+0x14b/0xd20 lib/xarray.c:1430 shmem_add_to_page_cache+0x81e/0xcc0 mm/shmem.c:889 shmem_alloc_and_add_folio+0x968/0x1090 mm/shmem.c:1928 shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2522 shmem_get_folio mm/shmem.c:2628 [inline] shmem_write_begin+0x165/0x350 mm/shmem.c:3278 generic_perform_write+0x346/0x990 mm/filemap.c:4189 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3454 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xacf/0xd10 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 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: 0033:0x7f17fe98b85f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48 RSP: 002b:00007f17ff803df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f17fe98b85f RDX: 0000000001000000 RSI: 00007f17f5600000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005939 R10: 0000000020005b42 R11: 0000000000000293 R12: 0000000000000003 R13: 00007f17ff803ef0 R14: 00007f17ff803eb0 R15: 00007f17f5600000 </TASK> ---[ end trace ]--- --- 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
