loop0: detected capacity change from 0 to 32768 ================================================================================ UBSAN: shift-out-of-bounds in fs/jfs/jfs_extent.c:511:16 shift exponent -1 is negative CPU: 1 PID: 3498 Comm: syz-executor338 Not tainted 5.15.118-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 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 nobh_write_begin+0x398/0xda0 fs/buffer.c:2650 jfs_write_begin+0x3e/0x80 fs/jfs/inode.c:322 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776 __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3903 generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3935 call_write_iter include/linux/fs.h:2103 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacf/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 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: 0033:0x7f044c6a4849 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffefbe2f568 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f044c6a4849 RDX: 00000000200000c7 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00007f044c6640e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000005eac R11: 0000000000000246 R12: 00007f044c664170 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ================================================================================