syzbot

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UBSAN: shift-out-of-bounds in fs/jfs/jfs_extent.c:329:16
shift exponent 64 is too large for 64-bit type 's64' (aka 'long long')
CPU: 0 UID: 0 PID: 5839 Comm: syz-executor260 Tainted: G        W           6.16.0-syzkaller-12063-g37816488247d #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494
 extBalloc fs/jfs/jfs_extent.c:329 [inline]
 extAlloc+0xd52/0xfb0 fs/jfs/jfs_extent.c:127
 jfs_get_block+0x346/0xab0 fs/jfs/inode.c:248
 __block_write_begin_int+0x6b2/0x1900 fs/buffer.c:2145
 block_write_begin+0x8a/0x120 fs/buffer.c:2256
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:300
 generic_perform_write+0x29d/0x8c0 mm/filemap.c:4175
 generic_file_write_iter+0x118/0x550 mm/filemap.c:4318
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x554/0xaa0 fs/read_write.c:686
 ksys_write+0x14b/0x260 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6faea35b99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffda611b258 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007f6faea35b99
RDX: 00000000fffffdef RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f6faeaae5f0 R08: 0000555587b974c0 R09: 0000555587b974c0
R10: 0000555587b974c0 R11: 0000000000000246 R12: 00007ffda611b280
R13: 00007ffda611b4a8 R14: 431bde82d7b634db R15: 00007f6faea7e03b
 </TASK>
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