loop3: detected capacity change from 0 to 32768 ================================================================================ UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1671:12 shift exponent -256 is negative CPU: 0 PID: 11207 Comm: syz-executor.3 Not tainted 6.1.0-rc1-syzkaller-00249-g4da34b7d175d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 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+0x3a6/0x420 lib/ubsan.c:322 dbFindCtl+0x451/0x5f0 fs/jfs/jfs_dmap.c:1671 dbAllocAny fs/jfs/jfs_dmap.c:1502 [inline] dbAlloc+0x31b/0xc90 fs/jfs/jfs_dmap.c:732 extBalloc fs/jfs/jfs_extent.c:321 [inline] extAlloc+0x528/0x1030 fs/jfs/jfs_extent.c:122 jfs_get_block+0x410/0xe30 fs/jfs/inode.c:248 __block_write_begin_int+0x57c/0x1ae0 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x93/0x1e0 fs/buffer.c:2102 jfs_write_begin+0x2d/0x60 fs/jfs/inode.c:304 generic_perform_write+0x314/0x610 mm/filemap.c:3753 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3881 generic_file_write_iter+0xab/0x310 mm/filemap.c:3913 do_iter_write+0x6f0/0xc50 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_pwritev+0x219/0x360 fs/read_write.c:1031 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8889a8b5f9 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:00007f888ac75168 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f8889babf80 RCX: 00007f8889a8b5f9 RDX: 0000000000000002 RSI: 0000000020003380 RDI: 0000000000000003 RBP: 00007f8889ae67b0 R08: 0000000002000005 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffedd94eff R14: 00007f888ac75300 R15: 0000000000022000 ================================================================================