================================================================================ UBSAN: shift-out-of-bounds in fs/jfs/jfs_extent.c:511:16 shift exponent -1 is negative CPU: 1 PID: 6432 Comm: syz-executor.5 Not tainted 5.15.131-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] __ubsan_handle_shift_out_of_bounds+0x3bf/0x420 lib/ubsan.c:321 extBalloc fs/jfs/jfs_extent.c:511 [inline] extAlloc+0xe4f/0x1010 fs/jfs/jfs_extent.c:125 jfs_get_block+0x417/0xe50 fs/jfs/inode.c:258 __mpage_writepage+0x4f9/0x1c00 fs/mpage.c:564 write_cache_pages+0xa97/0x1160 mm/page-writeback.c:2255 mpage_writepages+0x13c/0x2f0 fs/mpage.c:712 do_writepages+0x481/0x730 mm/page-writeback.c:2364 filemap_fdatawrite_wbc+0x1d6/0x230 mm/filemap.c:400 __filemap_fdatawrite_range mm/filemap.c:433 [inline] file_write_and_wait_range+0x1cb/0x2b0 mm/filemap.c:810 jfs_fsync+0x6e/0x1c0 fs/jfs/file.c:24 vfs_fsync_range fs/sync.c:188 [inline] vfs_fsync fs/sync.c:202 [inline] do_fsync fs/sync.c:212 [inline] __do_sys_fdatasync fs/sync.c:225 [inline] __se_sys_fdatasync fs/sync.c:223 [inline] __x64_sys_fdatasync+0xb1/0x100 fs/sync.c:223 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+0x61/0xcb RIP: 0033:0x7f33b0a48ae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f33a7b880c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004b RAX: ffffffffffffffda RBX: 00007f33b0b68120 RCX: 00007f33b0a48ae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f33b0a9447a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f33b0b68120 R15: 00007fff679c4188 ================================================================================