loop0: detected capacity change from 0 to 32768 ================================================================================ UBSAN: shift-out-of-bounds in fs/jfs/jfs_extent.c:314:16 shift exponent -1 is negative CPU: 1 PID: 5643 Comm: syz-executor.0 Not tainted 6.3.0-rc7-next-20230420-syzkaller-13291-g44bf136283e5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:217 [inline] __ubsan_handle_shift_out_of_bounds+0x221/0x5a0 lib/ubsan.c:387 extBalloc fs/jfs/jfs_extent.c:314 [inline] extAlloc.cold+0x8d/0x92 fs/jfs/jfs_extent.c:122 jfs_get_block+0x665/0xa90 fs/jfs/inode.c:248 __block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:2064 __block_write_begin fs/buffer.c:2114 [inline] block_write_begin+0xb9/0x4d0 fs/buffer.c:2175 jfs_write_begin+0x31/0xd0 fs/jfs/inode.c:299 generic_perform_write+0x256/0x570 mm/filemap.c:3921 __generic_file_write_iter+0x2ae/0x500 mm/filemap.c:4049 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4081 call_write_iter include/linux/fs.h:1854 [inline] do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735 do_iter_write+0x185/0x7e0 fs/read_write.c:860 vfs_writev+0x1aa/0x670 fs/read_write.c:933 do_writev+0x133/0x2f0 fs/read_write.c:976 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f63c068b5f9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f63c18c4168 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f63c07abf80 RCX: 00007f63c068b5f9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007f63c06e67b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcce8962ef R14: 00007f63c18c4300 R15: 0000000000022000 ================================================================================