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charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: a6afa4199d3d Merge tag 'mailbox-v6.1' of git://git.linaro... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=178292a4880000 kernel config: https://syzkaller.appspot.com/x/.config?x=d19f5d16783f901 dashboard link: https://syzkaller.appspot.com/bug?extid=b9ba793adebb63e56dba compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1322ae34880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10403c94880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/12e24d042ff9/disk-a6afa419.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4862ae4e2edf/vmlinux-a6afa419.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/307612ff696d/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b9ba793adebb63e56dba@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 ================================================================================ UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:2217:15 shift exponent -1368651876 is negative CPU: 0 PID: 3606 Comm: syz-executor109 Not tainted 6.0.0-syzkaller-09039-ga6afa4199d3d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322 dbAllocBits+0x96f/0x9c0 fs/jfs/jfs_dmap.c:2217 dbAllocDmap fs/jfs/jfs_dmap.c:1999 [inline] dbAllocDmapLev+0x240/0x420 fs/jfs/jfs_dmap.c:1953 dbAllocCtl+0x113/0x970 fs/jfs/jfs_dmap.c:1793 dbAllocAny fs/jfs/jfs_dmap.c:1507 [inline] dbAlloc+0x5ae/0xc90 fs/jfs/jfs_dmap.c:732 extBalloc fs/jfs/jfs_extent.c:321 [inline] extAlloc+0x4b9/0xff0 fs/jfs/jfs_extent.c:122 jfs_get_block+0x342/0xce0 fs/jfs/inode.c:248 __block_write_begin_int+0x5f6/0x1ba0 fs/buffer.c:2006 __block_write_begin fs/buffer.c:2056 [inline] block_write_begin+0x93/0x1e0 fs/buffer.c:2117 jfs_write_begin+0x2d/0x60 fs/jfs/inode.c:304 generic_perform_write+0x2a8/0x5b0 mm/filemap.c:3745 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3873 generic_file_write_iter+0xab/0x310 mm/filemap.c:3905 do_iter_write+0x6c2/0xc20 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_writev+0x23e/0x430 fs/read_write.c:977 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe1ef5c4e39 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff5e480f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fe1ef5c4e39 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007fe1ef584600 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000f8008000 R13: 0000000000000000 R14: 00080000000000f4 R15: 0000000000000000 ================================================================================ --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches