loop5: 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: 0 PID: 4061 Comm: syz-executor.5 Not tainted 6.1.44-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __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:314 [inline]
 extAlloc+0xe4f/0x1010 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x417/0xe50 fs/jfs/inode.c:248
 get_more_blocks fs/direct-io.c:665 [inline]
 do_direct_IO fs/direct-io.c:953 [inline]
 __blockdev_direct_IO+0x1ba3/0x4340 fs/direct-io.c:1266
 blockdev_direct_IO include/linux/fs.h:3228 [inline]
 jfs_direct_IO+0xf6/0x1e0 fs/jfs/inode.c:336
 generic_file_direct_write+0x204/0x460 mm/filemap.c:3678
 __generic_file_write_iter+0x1c4/0x400 mm/filemap.c:3838
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3914
 do_iter_write+0x6e6/0xc50 fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_pwritev+0x216/0x360 fs/read_write.c:1031
 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: 0033:0x7fcea767cae9
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:00007fcea835d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fcea779bf80 RCX: 00007fcea767cae9
RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000004
RBP: 00007fcea76c847a R08: 0000000000000408 R09: 0000000000000004
R10: 0000000000001400 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fcea779bf80 R15: 00007fff40319c88
 </TASK>
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